[plug] ipchains

[Gavin Corfield]

Hi all,

I'm trying to set up the ipchains for a gateway server.  I want to allow
all traffinc on the loca network.  I am trying to enable the server to
ping all machines on the LAN, however having run:

ipchains -P input DENY
ipchains -P output DENY
ipchains -P forward DENY

I am having trouble enabling the server to ping other machines.

What I am having trouble getting my head round is:

When I execute ping host_on_local_net what is actually happening? Is it:

localhost --> packet to kernel sorce 127.0.0.1 --> forward packet to net
card 

in which case I need to forward the packet with something like:

ipchains -A forward -p all -s localhost -d server.localnet -j ACCEPT -i
lo


or:

server.localnet --> netcard 

in which case I need to ouptut the packet with something like

ipchains -A output -p all -s server.localnet -d local_net -i eth0



I hope that's clear thanks in advance

gavin