Re: eth1 messing up eth0 and routing question

["Ralf G. R. Bergs" <rabe@RWTH-Aachen.DE>]

On 5 Sep 2001 08:29:37 -0700, bedlam@alumni.rice.edu wrote:

>I can ping outside and inside networks from the router, and I can ping the LAN 
side of the router from a local computer, but I can't ping outside from the 
local computer.

You need SNAT ("ip masquerading") like this:

    if [ -n "$EXTERNAL" ]; then
        for ext in $EXTERNAL; do
            ipnm_cache $ext
            $IPTABLES -t nat -A POSTROUTING -o $ext -j SNAT --to $IPOFIF
        done
    fi

$EXTERNAL is the set of external interfaces you have, "ipnm_cache" precomputes 
the IP address and netmask for the respective external interface (the IP address 
gets stored in $IPOFIF.)


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