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docker_notes:docker-dns [2025-08-17 Sun wk33 10:13] – [Linux setup to forward packets] baumkpdocker_notes:docker-dns [2025-08-17 Sun wk33 10:27] (current) – [Linux setup to forward packets] baumkp
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 =====Linux setup to forward packets===== =====Linux setup to forward packets=====
 +<color #ed1c24>[This probably needs to be moved and consolidated elsewhere and then highlevel only reference here]</color>
 +
 The main router must be set to forward packets! The main router must be set to forward packets!
 It would seem that as of Debian 13 the ''/etc/sysctl.conf'' file is not longer used, and is deleted on upgrade, including any user changes.  Instead overrides must be copied into *.conf files in /etc/sysctl.d/. Normally user conf files in *.d directories are not affected by upgrades. It would seem that as of Debian 13 the ''/etc/sysctl.conf'' file is not longer used, and is deleted on upgrade, including any user changes.  Instead overrides must be copied into *.conf files in /etc/sysctl.d/. Normally user conf files in *.d directories are not affected by upgrades.
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 After applying these changes reboot or apply setting using ''sudo sysctl -p /etc/sysctl.d/ip_forward.conf'' (Note that ''sudo sysctl -p'' defaults to using ''/etc/sysctl.conf'' and will error if this file is not available.) After applying these changes reboot or apply setting using ''sudo sysctl -p /etc/sysctl.d/ip_forward.conf'' (Note that ''sudo sysctl -p'' defaults to using ''/etc/sysctl.conf'' and will error if this file is not available.)
   * ''sudo sysctl -w net.ipv6.conf.all.forwarding=1'' will immediately set this parameter, but it will not be permanent and lost on reboot.   * ''sudo sysctl -w net.ipv6.conf.all.forwarding=1'' will immediately set this parameter, but it will not be permanent and lost on reboot.
 +
 +The boot systemctl reads the following configuration files to adjust kernel parameters at boot:
 +  */etc/sysctl.d/*.conf
 +  */run/sysctl.d/*.conf
 +  */usr/local/lib/sysctl.d/*.conf
 +  */usr/lib/sysctl.d/*.conf
 +  */lib/sysctl.d/*.conf
 +