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Fail2ban Info

Some useful info:

https://www.digitalocean.com/community/tutorials/how-to-protect-an-nginx-server-with-fail2ban-on-ubuntu-22-04
https://linux-notes.org/ustanovka-fail2ban/
https://github.com/Bebef/fail2ban-filter.d
https://stackoverflow.com/questions/19794107/fail2ban-error-can´t-ban-with-lighttpssd-auth
https://easyengine.io/tutorials/nginx/fail2ban/

Check who’s banned:

fail2ban-client status JAILNAME

fail2ban alerts sent to a Rocket.Chat channel:

https://forums.rocket.chat/t/fail2ban-and-rocket-chat-integration/2544

Incremental bantime:

https://habr.com/ru/post/238303/

Check how filter works:

fail2ban-regex /var/log/somelog.log /etc/fail2ban/filter.d/somefilter.conf
Add –print-all-missed or –print-all-matched to see missed and matched lines.

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Cisco Info

Serial number check (warranty etc):

https://cway.cisco.com/sncheck/

Настройка ASA, да и вообще отличный сайт с мануалами

https://xgu.ru/wiki/Cisco_ASA

Практические руководства по начальной настройке:

https://pyatilistnik.org/kak-nastroit-kommutatoryi-cisco-3-urovnya-na-primere-cisco-3560/
https://pyatilistnik.org/kak-nastroit-marshrutizator-cisco-organizatsiya-seti-dlya-nebolshogo-ofisa/
https://pyatilistnik.org/staticheskaya-marshrutizatsiya-cisco/

WiFi blog:

https://mrncciew.com/

Working with the flash file system:

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/system_management/configuration_guide/b_sm_3se_3850_cg/b_sm_3se_3850_cg_chapter_010011.html

Recursively delete non-empty folder from flash:

delete /force /recursive flash:FOLDERNAME

Passwords Security:

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/security/s1/sec-s1-xe-3se-3850-cr-book/sec-s1-xe-3se-3850-cr-book_chapter_0110.html

Cisco Device Security:

https://arny.ru/education/ccnp-enterprise/rasshirennaya-bezopasnost-cisco/

How to Reset Cisco Catalyst 3560 Back to Factory Defaults:

https://fatmin.com/2015/09/29/how-to-reset-cisco-catalyst-3560-back-to-factory-defaults
First you need to power down the switch. Once the switch is powered off, hold down the mode button, and power the switch on. The switch will boot up and you should see the switch prompt as shown below.
Now type flash_init. Your output should be similar to what you see below.
Check out the contents of flash and locate config.text and vlan.dat (if it exists).
Now delete the vlan.dat and config.text.
Reboot switch

Enter Rommon:

Push Ctrl and Break (use submenu in Putty) before the device start loading firmware.

Recover Catalyst Fixed Configuration Switches from a Corrupted Image:

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-2950-series-switches/41845-192.html

Show full config:

show run all

Cisco hardware and info short:

http://wiki.ciscolinux.co.uk/index.php/Cisco_1941_with_EHWIC-4G-LTE-G

Cisco EHWIC-4G-LTE info:

https://jakondo.ru/nastrojka-modulya-cisco-ehwic-4g-lte-g-na-rabotu-s-mobilnym-operatorom-yota/

Additional ACL Features:

https://etutorials.org/Networking/Router+firewall+security/Part+III+Nonstateful+Filtering+Technologies/Chapter+7.+Basic+Access+Lists/Additional+ACL+Features/

Cisco IP SLA info:

IP SLA is needed, in particular, for setting up redundancy in networks with static routing.
https://www.practicalnetworking.net/stand-alone/cisco-ip-sla-using-a-cisco-router-to-generate-traffic/
https://learningnetwork.cisco.com/s/question/0D53i00000Kt0s9CAB/ip-sla-tracking-issue

Configuring native VLANs on Cisco Switches:

https://www.practicalnetworking.net/stand-alone/configuring-vlans/