[SATLUG] dd-wrt default iptables rules

Bruce Dubbs bruce.dubbs at gmail.com
Wed Jun 24 14:59:14 CDT 2009


On the advice of several here, I bought a WRT54GL router.

The install of dd-wrt.v24_mini_generic.bin went fine.

Before I go live to the internet, I'd like to understand the default iptables 
rules. I've looked at them and understand most. I would like to know what the 
following rules do.

In filter/FORWARD:

Code:
target     prot opt in     out     source               destination

TRIGGER    0    --  vlan1  br0     anywhere             anywhere 
TRIGGER type:in match:0 relate:0


In nat/PREROUTING:
Code:
TRIGGER    0    --  any    any     anywhere             0.0.0.0 
TRIGGER type:dnat match:0 relate:0


I've looked in the iptables documentation and source and the netfilter portion 
of the kernel source and cannot find any reference to a TRIGGER target.

Can anyone shed light on what these instructions do?

   -- Bruce


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