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Data protection

Data protection
 

This Privacy Policy clarifies the nature, scope and purpose of the processing of personal data (hereinafter referred to as "Data") within our online offering and the related websites, features and content, as well as external online presence, e.g. our social media profiles on. (collectively referred to as "online offer"). With regard to the terminology used, e.g. "Processing" or "Responsible", we refer to the definitions in Article 4 of the General Data Protection Regulation (GDPR).

 
Responsible

Peter Taube
Bismarckstrasse 13
71272 Renningen
Germany
e-mail address: contact @ linux-tips-and-tricks.de
Imprint: https://www.linux-tips-and-tricks.de/de/impressum

 
Types of processed data:

- usage data (e.g., websites visited, interest in content, access times).
- Meta / communication data (e.g., device information, IP addresses).

 
Purpose of processing

- Provision of the online offer, its functions and contents.
- Answering contact requests and communicating with users.
- Safety measures.
- Reach Measurement / Marketing


Used terms

"Personal data" means any information relating to an identified or identifiable natural person (hereinafter the "data subject"); a natural person is considered as identifiable, which can be identified directly or indirectly, in particular by means of assignment to an identifier such as a name, to an identification number, to location data, to an online identifier (eg cookie) or to one or more special features, that express the physical, physiological, genetic, mental, economic, cultural or social identity of this natural person.

"Processing" means any process performed with or without the aid of automated procedures or any such process associated with personal data. The term goes far and includes virtually every handling of data.

"Responsible person" means the natural or legal person, public authority, body or body that decides, alone or in concert with others, on the purposes and means of processing personal data.

 

Relevant legal bases

In accordance with Art. 13 GDPR, we inform you about the legal basis of our data processing. Unless the legal basis in the data protection declaration is mentioned, the following applies: The legal basis for obtaining consent is Article 6 (1) lit. a and Art. 7 DSGVO, the legal basis for the processing for the performance of our services and the execution of contractual measures as well as the response to inquiries is Art. 6 (1) lit. b DSGVO, the legal basis for processing in order to fulfill our legal obligations is Art. 6 (1) lit. c DSGVO, and the legal basis for processing in order to safeguard our legitimate interests is Article 6 (1) lit. f DSGVO. In the event that vital interests of the data subject or another natural person require the processing of personal data, Art. 6 para. 1 lit. d DSGVO as legal basis.

 
Safety measures

We ask you to inform yourself regularly about the content of our privacy policy. We will adjust the privacy policy as soon as the changes to the data processing we make require it. We will notify you as soon as the changes require your participation (eg consent) or other individual notification.

 
Collaboration with processors and third parties

If, in the context of our processing, we disclose data to other persons and companies (contract processors or third parties), transmit them to them or otherwise grant access to the data, this will only be done on the basis of a legal permission (eg if a transmission of the data to third parties, as required by payment service providers, pursuant to Art. 6 (1) (b) GDPR to fulfill the contract), you have consented to a legal obligation or based on our legitimate interests (eg the use of agents, webhosters, etc.).

If we commission third parties to process data on the basis of a so-called "contract processing contract", this is done on the basis of Art. 28 GDPR.

 
Transfers to third countries

If we process data in a third country (ie outside the European Union (EU) or the European Economic Area (EEA)) or in the context of the use of third party services or disclosure or transmission of data to third parties, this will only be done if it is to fulfill our (pre) contractual obligations, on the basis of your consent, on the basis of a legal obligation or on the basis of our legitimate interests. Subject to legal or contractual permissions, we process or have the data processed in a third country only in the presence of the special conditions of Art. 44 et seq. DSGVO. That the processing is e.g. on the basis of specific guarantees, such as the officially recognized level of data protection (eg for the US through the Privacy Shield) or compliance with officially recognized special contractual obligations (so-called "standard contractual clauses").

 

Rights of data subjects

You have the right to ask for confirmation as to whether the data in question is being processed and for information about this data as well as for further information and a copy of the data in accordance with Art. 15 GDPR.

You have accordingly. Art. 16 DSGVO the right to demand the completion of the data concerning you or the correction of the incorrect data concerning you.

In accordance with Art. 17 GDPR, they have the right to demand that the relevant data be deleted immediately or, alternatively, to require a restriction of the processing of data in accordance with Art. 18 GDPR.

You have the right to demand that the data relating to you, which you have provided to us, be obtained in accordance with Art. 20 GDPR and request their transmission to other persons responsible.

You have gem. Art. 77 DSGVO the right to file a complaint with the competent supervisory authority.

 
Withdrawal

You have the right to grant consent in accordance with. Art. 7 para. 3 DSGVO with effect for the future

 
Right to

You can object to the future processing of your data in accordance with Art. 21 GDPR at any time. The objection may in particular be made against processing for direct marketing purposes.

 
Cookies and right to object in direct mail

"Cookies" are small files that are stored on users' computers. Different information can be stored within the cookies. A cookie is primarily used to store the information about a user (or the device on which the cookie is stored) during or after his visit to an online offer. Temporary cookies, or "session cookies" or "transient cookies", are cookies that are deleted after a user leaves an online service and closes his browser. In such a cookie, e.g. the contents of a shopping cart are stored in an online store or a login jam. The term "permanent" or "persistent" refers to cookies that remain stored even after the browser has been closed. Thus, e.g. the login status will be saved if users visit it after several days. Likewise, in such a cookie the interests of the users can be stored, which are used for range measurement or marketing purposes. A "third-party cookie" refers to cookies that are offered by providers other than the person who manages the online offer (otherwise, if it is only their cookies, this is called "first-party cookies").

We can use temporary and permanent cookies and clarify this in the context of our privacy policy.

If users do not want cookies stored on their computer, they will be asked to disable the option in their browser's system settings. Saved cookies can be deleted in the system settings of the browser. The exclusion of cookies can lead to functional restrictions of this online offer.

A general contradiction to the use of cookies used for online marketing purposes can be found in a variety of services, especially in the case of tracking, via the US website http://www.aboutads.info/choices/ or the EU site http://www.youronlinechoices.com/ be explained. Furthermore, the storage of cookies can be achieved by switching them off in the settings of the browser. Please note that not all features of this online offer may be used.

 

Deletion of data

The data processed by us are deleted or limited in their processing in accordance with Articles 17 and 18 GDPR. Unless explicitly stated in this privacy policy, the data stored by us are deleted as soon as they are no longer required for their purpose and the deletion does not conflict with any statutory storage requirements. Unless the data is deleted because it is required for other and legitimate purposes, its processing will be restricted. That The data is blocked and not processed for other purposes. This applies, for example for data that must be kept for commercial or tax reasons.

According to legal requirements in Germany, the storage takes place in particular for 10 years according to §§ 147 Abs. 1 AO, 257 Abs. 1 Nr. 1 and 4, Abs. 4 HGB (books, records, management reports, accounting documents, trading books, relevant for taxation Documents, etc.) and 6 years in accordance with § 257 (1) no. 2 and 3, para. 4 HGB (commercial letters).

According to legal regulations in Austria the storage takes place especially for 7 years according to § 132 paragraph 1 BAO (accounting documents, receipts / invoices, accounts, receipts, business papers, statement of income and expenses, etc.), for 22 years in connection with real estate and for 10 years in the case of documents relating to electronically supplied services, telecommunications, broadcasting and television services provided to non-entrepreneurs in EU Member States and for which the Mini-One-Stop-Shop (MOSS) is used.

 
Hosting

The hosting services we use are for the purpose of providing the following services: infrastructure and platform services, computing capacity, storage and database services, security and technical maintenance services we use to operate this online service.

Here we, or our hosting provider, process inventory data, contact data, content data, contract data, usage data, meta and communication data of customers, interested parties and visitors to this online offer on the basis of our legitimate interests in an efficient and secure provision of this online offer acc. Art. 6 para. 1 lit. f DSGVO i.V.m. Art. 28 DSGVO (conclusion of contract processing contract).

 
Collection of access data and log files

We, or our hosting provider, collects on the basis of our legitimate interests within the meaning of Art. 6 para. 1 lit. f. DSGVO Data on every access to the server on which this service is located (so-called server log files). The access data includes name of the retrieved web page, file, date and time of retrieval, amount of data transferred, message about successful retrieval, browser type and version, the user's operating system, referrer URL (the previously visited page), IP address and the requesting provider ,

Logfile information is stored for security purposes (for example, to investigate abusive or fraudulent activities) for a maximum of 7 days and then deleted. Data whose further retention is required for evidential purposes shall be exempted from the cancellation until final clarification of the incident.

 

 
Comments and posts

If users leave comments or other contributions, their IP addresses may be based on our legitimate interests within the meaning of Art. 6 para. 1 lit. f. DSGVO be stored for 7 days. This is for our own safety, if someone leaves illegal content in comments and contributions (insults, prohibited political propaganda, etc.). In this case, we ourselves can be prosecuted for the comment or post and are therefore interested in the identity of the author.

Furthermore, we reserve the right, in accordance with our legitimate interests. Art. 6 para. 1 lit. f. DSGVO to process the information of users for the purpose of spam detection.

Range measurement with Matomo

As part of Matomo's range analysis, the following data is processed on the basis of our legitimate interests (ie interest in the analysis, optimization and economic operation of our online offer as defined in Art. 6 (1) lit. DSGVO): the type of browser you use and the browser version, the operating system you are using, your country of origin, the date and time of the server request, the number of visits, how long you have spent on the site, and the external links you have activated. The IP address of the users is anonymized before being saved.

Matomo uses cookies that are stored on users' computers and that allow an analysis of how users use our online offerings. In this case, pseudonymous usage profiles of the users can be created from the processed data. The cookies have a retention period of one week. The information generated by the cookie about your use of this website will only be stored on our server and will not be passed on to third parties.

Users can object to the anonymized data collection by the program Matomo at any time with effect for the future by clicking on the link below. In this case, a so-called opt-out cookie is stored in your browser, with the result that Matomo no longer collects session data. If users delete their cookies, however, this means that the opt-out cookie is also deleted and must therefore be reactivated by the users.

 

The logs with the data of the users will be deleted after 6 months at the latest.

 
Online presence in social media

We maintain online presence within social networks and platforms in order to communicate with customers, prospects and users active there and to inform them about our services. When calling the respective networks and platforms, the terms and conditions and the data processing guidelines apply to their respective operators.

Unless otherwise stated in our Privacy Policy, we process users' data as long as they communicate with us within social networks and platforms, e.g. Write posts on our online presence or send us messages.

 
Integration of services and contents of third parties

Based on our legitimate interests (ie interest in the analysis, optimization and economic operation of our online offer within the meaning of Art. 6 (1) lit. DSGVO), we make use of content or services offered by third-party providers in order to provide their content and services Services, such as Include videos or fonts (collectively referred to as "content").

This always presupposes that the third-party providers of this content perceive the IP address of the users, since they could not send the content to their browser without the IP address. The IP address is therefore required for the presentation of this content. We endeavor to use only content whose respective providers use the IP address solely for the delivery of the content. Third parties may also use so-called pixel tags (invisible graphics, also referred to as "web beacons") for statistical or marketing purposes. The "pixel tags" can be used to evaluate information such as visitor traffic on the pages of this website. The pseudonymous information may also be stored in cookies on the user's device and may include, but is not limited to, technical information about the browser and operating system, referring web pages, visit time, and other information regarding the use of our online offer.

 
Google ReCaptcha

We bind the function to detect bots, e.g. when entering into online forms ("ReCaptcha") of the provider Google LLC, 1600 Amphitheater Parkway, Mountain View, CA 94043, USA. Privacy Policy: https://www.google.com/policies/privacy/, opt-out: https://adssettings.google.com/authenticated.

 

Use of Facebook social plugins

Based on our legitimate interests (ie interest in the analysis, optimization and economic operation of our online offer within the meaning of Art. 6 (1) f. DSGVO) we use social plugins ("plugins") of the social network facebook.com, which operated by Facebook Ireland Ltd., 4 Grand Canal Square, Grand Canal Harbor, Dublin 2, Ireland ("Facebook"). The plugins can represent interaction elements or content (eg videos, graphics or text contributions) and can be recognized by one of the Facebook logos (white "f" on blue tile, the terms "Like", "Like" or a "thumbs up" sign ) or are marked with the addition "Facebook Social Plugin". The list and appearance of Facebook Social Plugins can be viewed here: https://developers.facebook.com/docs/plugins/.

Facebook is certified under the Privacy Shield Agreement, which provides a guarantee to comply with European privacy legislation (https://www.privacyshield.gov/participant?id=a2zt0000000GnywAAC&status=Active).

When a user invokes a feature of this online offering that includes such a plugin, their device establishes a direct connection to the Facebook servers. The content of the plugin is transmitted by Facebook directly to the device of the user and incorporated by him into the online offer. In the process, user profiles can be created from the processed data. We therefore have no influence on the amount of data that Facebook collects with the help of this plugin and therefore informs the users according to our knowledge.

By integrating the plugins, Facebook receives the information that a user has accessed the corresponding page of the online offer. If the user is logged in to Facebook, Facebook can assign the visit to his Facebook account. If users interact with the plugins, for example, press the Like button or leave a comment, the information is transmitted from your device directly to Facebook and stored there. If a user is not a member of Facebook, there is still the possibility that Facebook will find out and save their IP address. According to Facebook, only an anonymous IP address is stored in Germany.

The purpose and scope of the data collection and the further processing and use of the data by Facebook, as well as the related rights and setting options for protecting the privacy of users, can be found in Facebook's privacy policy: https://www.facebook.com/about/privacy/ ,

If a user is a Facebook member and does not want Facebook to collect data about him via this online offer and link it to his member data stored on Facebook, he must log out of Facebook and delete his cookies before using our online offer. Other settings and inconsistencies regarding the use of data for advertising purposes are possible within the Facebook profile settings: https://www.facebook.com/settings?tab=ads or via the US-American site http://www.aboutads.info / choices / or the EU page http://www.youronlinechoices.com/. The settings are platform independent, i. they are adopted for all devices, such as desktop computers or mobile devices.

 

Google Adsense

This website uses Google Adsense, a web advertising service of Google Inc., USA ('' Google ''). Google Adsense uses so-called 'cookies' (text files) which are stored on your computer and which allows you to analyze the use of the website by you. Google Adsense also uses so-called 'web beacons' (small invisible graphics) to gather information. By using the web beacon, simple actions such as visitor traffic on the website can be recorded and collected. The information generated by the cookie and / or web beacon about your use of this website (including your IP address) will be transmitted to and stored by Google on servers in the United States. Google will use this information to evaluate your use of the website in terms of advertising, to compile reports on website activity and advertisements for website operators, and to provide other services related to website activity and internet usage. Google may also transfer this information to third parties if required by law or as far as third parties process this data on behalf of Google. Google will in no case associate your IP address with other Google data. You can prevent the storage of cookies on your hard disk and the display of web beacons by selecting 'Do not accept cookies' in your browser settings (In MS Internet Explorer under '' Tools> Internet Options> Privacy> Settings '' in Firefox under '' Tools> Settings> Privacy> Cookies ''); however, please note that in this case you may not be able to use all features of this website to the fullest extent. By using this website, you consent to the processing of data about you by Google in the manner and for the purposes set out above.

 

Created witht Datenschutz-Generator.de of RA Dr. Thomas Schwenke and translated from German into English with Google Translate

 

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rpi-clone doesn't create a bootable clone any more on Bookworm

Details
Category: Raspberry
Also available:  German (DE) 
Created: 28 January 2024
Last Updated: 24 February 2024
Hits: 2354
  • backup
  • raspberry
  • raspberryrpi-clone
  • backupbookworm

User Rating: 5 / 5

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Read more: rpi-clone doesn't create a bootable clone any more on Bookworm Add new comment Hits: 2354

Starting with Bookworm /boot/cmdline.txt was maoved to /boot/firmware/cmdline.txt. Therefore rpi-clone can unfortunately no longer update the UUID of the clone and the clone no longer starts. Details are described here on github.

How to get through two firewalls with VPN and ssh tunneling?

Details
Category: Security
Created: 08 February 2024
Last Updated: 08 February 2024
Hits: 2836
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Read more: How to get through two firewalls with VPN and ssh tunneling? Add new comment Hits: 2836

Usually you just start one VPN on your system to get through a firewall. But if you have to go through a second firewall later it's difficult to configure. That's a common situation if you first have to go through a company or country firewall and then enter your home network which is protected by a firewall. As long a you use a Linux system and a system in your target network protected by a firewall offers ssh access there exists an easy way to get it done.

 

raspiBackup has a new logo

Details
Category: raspiBackup
Also available:  German (DE) 
Created: 24 September 2023
Last Updated: 28 September 2023
Hits: 2732
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Read more: raspiBackup has a new logo Add new comment Hits: 2732
raspiBackup has a new logo. Friendly forum members from the German Raspberry forum helped me to create one.
 

sshuttle: packet_write_wait: Connection to port 22: Broken pipe

Details
Category: Networking
Created: 11 September 2023
Last Updated: 11 September 2023
Hits: 3137
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Read more: sshuttle: packet_write_wait: Connection to port 22: Broken pipe Add new comment Hits: 3137

I just had to tunnel inside a VPN to be able to connect to my home network. I tried OpenVPN and Wireguard but had issues to get it working. Therefore I decided to use ssh tunneling inside the existing VPN. There is a nice too called sshuttle available which easily allows to tunnel any requests through ssh.

 

PiShrink is just a hack

Details
Category: Raspberry
Also available:  German (DE) 
Created: 06 February 2023
Last Updated: 23 July 2023
Hits: 2811
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Read more: PiShrink is just a hack Add new comment Hits: 2811

PiShrink is a useful tool to compress backups created with win32diskimager and other windows tools as a full backup to reduce them to a minimum size.

It's a hack and works a lot of time. Unfortunatey there are a lot of situations you get an ugly error message which are created because of missing checks in the code.

 

How to test the CPU temperature of my Raspberry and check whether the CPU speed was throttled ?

Details
Category: Raspberry
Also available:  German (DE) 
Created: 24 July 2019
Last Updated: 22 October 2022
Hits: 6432
  • raspberry

User Rating: 5 / 5

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Read more: How to test the CPU temperature of my Raspberry and check whether the CPU speed was throttled ? Add new comment Hits: 6432

We now have a new Raspberry4 gibt, which in contrast to the previous versions becomes quite hot. So everybody is interested in the effectiveness of either passive or active cooling and whether this cooling suppresses CPU throtteling.

I wrote a small script check_throttled.sh which reads the current throttling states of the Raspberry with vcgencmd get_throttled and if throtteling happens or already happend the meaning of the throttling bits is reported.

 

raspiBackup - Configuration update when upgrading to a new version

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Category: raspiBackup
Also available:  German (DE) 
Created: 07 April 2020
Last Updated: 08 August 2022
Hits: 6739
  • raspiBackup

User Rating: 1 / 5

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Whenever an upgrade to a new version of raspiBackup is executed it's tested whether the new version has new configuration options. If there are new configuration options used the local configuration file will be merged into a new file with the new configuration file while upgrading raspiBackup. Following page describes in detail what's going on during a configuration update.

Note

If a version less than 0.6.5 is upgraded the configuration file merge has to be started manually after upgrading. Following command will start the configuration update:

sudo raspiBackup.sh --updateConfig
 

 

When the two configuration files are merged raspiBackup writes various information messages. Following messages are written when upgrading raspiBackup from v0.6.4.3 to v0.6.5:

--- RBK0241I: Merging current configuration v0.1.3 with new configuration v0.1.4 into /usr/local/etc/raspiBackup.conf.merged.
--- RBK0248I: Added option DEFAULT_SMART_RECYCLE=0.
--- RBK0248I: Added option DEFAULT_SMART_RECYCLE_DRYRUN=1.
--- RBK0248I: Added option DEFAULT_SMART_RECYCLE_OPTIONS="7 4 12 1".
--- RBK0248I: Added option DEFAULT_TELEGRAM_TOKEN="".
--- RBK0248I: Added option DEFAULT_TELEGRAM_CHATID="".
--- RBK0248I: Added option DEFAULT_TELEGRAM_NOTIFICATIONS="F".
--- RBK0248I: Added option DEFAULT_NOTIFY_START=0.
--- RBK0248I: Added option DEFAULT_COLORING="CM".
--- RBK0243I: Configuration merge finished successfullly but not activated.
!!! RBK0245W: Backup current configuration in /usr/local/etc/raspiBackup.conf.bak and activate updated configuration? y/N

 

Configuration file

/usr/local/etc/raspiBackup.conf.merged

will be created and receive the merged configuration files /usr/local/etc/raspiBackup.conf with the new configuration . RBK248 lists which changes are applied. Finally you have to answer the question whether you want to activate the merged configuration file. The existing configuration file will be saved in /usr/local/etc/raspiBackup.conf.bak. Do you answer with yes the configuration update is finished and you get following messages

--- RBK0240I: Saving current configuration /usr/local/etc/raspiBackup.conf to /usr/local/etc/raspiBackup.conf.bak.
--- RBK0244I: Merged configuration /usr/local/etc/raspiBackup.conf.merged copied to /usr/local/etc/raspiBackup.conf and activated.

That's the easiest way to activate the merged configuration file and you're done quickly.

But you also can answer no and the merged configuration file will not be activated. You get following message:

--- RBK0247I: Now review /usr/local/etc/raspiBackup.conf.merged and copy the configuration file to /usr/local/etc/raspiBackup.conf to finish the configuration update.

The new options in the merged configuration file can easily be identified:

# Smart recycle
# >>>>> NEW OPTION added in config version "0.1.4" <<<<<
DEFAULT_SMART_RECYCLE=0
# Smart recycle dryrun
# >>>>> NEW OPTION added in config version "0.1.4" <<<<<
DEFAULT_SMART_RECYCLE_DRYRUN=1
# Smart recycle parameters (daily, weekly, monthly and yearly)
# >>>>> NEW OPTION added in config version "0.1.4" <<<<<
DEFAULT_SMART_RECYCLE_OPTIONS="7 4 12 1"

Now use your editor and check /usr/local/etc/raspiBackup.conf.merged and change the contents if needed. Finally copy the merged configuration file to /usr/local/etc/raspiBackup.conf to activate the new configuration file.

Finally execute as usual whenever you upgraded raspiBackup a backup/restore cycle and test whether everything still works as before.

raspiBackup supports usage of different configuration files. The automatic configuration update is only done for /usr/local/etc/raspiBackup.conf. All other configuration files have to be updated manually. Just copy the lines marked as new configuration lines into the other configuration files.

Erfahrungen beim Umzug von Fritz!Box 7390 zu Fritz!Box 7590

Details
Category: Networking
Created: 03 August 2020
Last Updated: 03 August 2020
Hits: 11856

User Rating: 4 / 5

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Read more: Erfahrungen beim Umzug von Fritz!Box 7390 zu Fritz!Box 7590 1 comment Hits: 11856

Meine Fritz!Box 7390 hat viele Jahre dafür gesorgt dass ich einen zuverlässigen Zugriff von Zuhause ins Internet hatte. Machmal gab es Anschlussprobleme die aber nicht der Fritz!Box anzulasten waren sondern der Vermittlungsanlage sowie Infrastrukturprobleme meine Internetproviders 1und1.

Vor ca 1 Monat wurde mein Anschluss in der Vermittlungsanlage von 50Mb auf 100Mb umgestellt und meine Fritz!Box7390 fing danach intermittierend an in einer Woche 1-3 Mal die DSL Synchronisation zu verlieren obwohl die vertraglich vereinbarte Geschwindigkeit weiterhin bei 50Mb blieb. Ich muss aber dazu sagen dass der Download danach von 47Mb auf 51Mb sowie der Download von 9Mb auf 11Mb gestiegen ist. Anyhow ist die Fritz!Box 7390 offensichtlich ein wenig am ächzen bei der neuen Anbindung. Da die Fritz!Box 7390 keine Softwareupdates bekommt - und speziell keine sicherheitsrelevanten Softwareupdates - war beides zusammen für mich der Anlass mir eine Fritz!Box 7590 zu kaufen umd damit die gute alte Fritz!Box 7390 zu ersetzen.

 

Protect Raspberry Pi against internet attacks and disable attacks into the local network with a firewall using iptables

Details
Category: Raspberry
Also available:  German (DE) 
Created: 01 November 2014
Last Updated: 19 February 2017
Hits: 23295
  • raspberry
  • security
  • firewall
  • iptables

User Rating: 5 / 5

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Read more: Protect Raspberry Pi against internet attacks and disable attacks into the local network with a... Add new comment Hits: 23295

The Raspberry Pi is a nice system which is used a lot of time to provide server services to be accessible from worldwide. That's Owncloud, a HTTP server, seafile or other services..

A VPN is the right way to access the server in a secure way. But if you want to give a lot of people access there is no way other than to allow access direct from the internet. Usually you use a DMZ for this but that's a feature a normal home router doesn't have. But now you should protect the Raspberry from internet access as far as you can and also protect your home network from access from the pi server when an intruder managed to get access to the pi. But note: If an the intruder managed to get root access then the iptables firewall can be turned off very quickly. So it's very important to get SW updates on a regular base.

Following article describes how to configure an iptables firewall to protect it from unauthorized access from the internet and to protect a local home network to be attacked from the server - just in case.

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