https://techdoku.nogafam.es/ 2026-05-14T23:53:44+00:00 https://techdoku.nogafam.es/ https://techdoku.nogafam.es/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2021-06-03T09:48:13+00:00 Anonymous (anonymous@undisclosed.example.com) https://techdoku.nogafam.es/doku.php?id=docu:csheet:net:iptables:accept_multicast_broadcast&rev=1622713693&do=diff Accept Multicast and Broadcast packets on iptables Adapt to your needs: iptables -A INPUT -i eth0 -m pkttype --pkt-type multicast -j ACCEPT iptables -A INPUT -i eth0 -m pkttype --pkt-type broadcast -j ACCEPT Some sources: <https://serverfault.com/questions/325652/how-to-make-iptables-allow-rule-for-multicast> text/html 2021-02-02T11:04:43+00:00 Anonymous (anonymous@undisclosed.example.com) https://techdoku.nogafam.es/doku.php?id=docu:csheet:net:iptables:block_packets_by_content&rev=1612263883&do=diff Block TCP/UDP packets by string content using iptables On *nix we can use iptables to block packets by it's clear content or string. This won't work on encrypted connections (unless you match an exact string that repeats on the encrypted connection) text/html 2020-07-19T22:32:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://techdoku.nogafam.es/doku.php?id=docu:csheet:net:iptables:port_redirection&rev=1595197928&do=diff How to redirect ports using Iptables (It may not work depending on more iptables rules or firewalls) Make the actual redirection from port 80 to 8080 iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080 For debugging purposes or for loopback access of this rule, you need to enable loopback redirection too from your machine.