Bureaucrats, dave_user, Administrators
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|First public release
|-
|{{oldid|5301|1.1.0}}
|August 2016
|Added section about persistent rules
|-
|1.1.1
|August 2016
|Added sysctl persistent settings
|-
|1.1.2
|May 2017
|Fix sysctl parameter
|-
|}
Before proceeding on port forwarding rules setting, the forwarding capability must be enabled on both <code>eth0</code> and <code>eth1</code> interfaces:
<pre>
root@sbc-lynx:~# sysctl -w net.ipv4.conf.eth0.forwarding=1
net.ipv4.conf.eth0.forwarding = 1
root@sbc-lynx:~# sysctl -w net.ipv4.conf.eth1.forwarding=1
net.ipv4.conf.eth1.forwarding = 1
</pre>
At the next boot the saved <code>iptables</code> rules will be automatically loaded.
----
Please note that <code>sysctl</code> settings (e.g. the ones used to enable packet forwarding) are not persistent across reboots. To apply sysctl settings at boot time automatically, just add them to [http://linux.die.net/man/5/sysctl.conf <code>/etc/sysctl.conf</code>] as <code>token = value</code>:
<pre>
root@sbc-lynx:~# tail /etc/sysctl.conf
#net.ipv6.conf.all.accept_source_route = 0
#
# Log Martian Packets
#net.ipv4.conf.all.log_martians = 1
#
#kernel.shmmax = 141762560
net.ipv4.conf.eth0.forwarding=1
net.ipv4.conf.eth1.forwarding=1
</pre>
sysctl.conf settings are applied with init script during network configuration (see <code>/etc/init.d/networking</code>)
To check sysctl.conf syntax user can apply those settings also manually with the following command:
<pre>
root@sbc-lynx:~# sysctl -p /etc/sysctl.conf
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.eth0.forwarding = 1
net.ipv4.conf.eth1.forwarding = 1
</pre>
