-> 
->I have a strange occurrence of lag on my local networking.  I have a
->cable modem that plugs into a Debian server, then that Debian server is
->plugged into a switch that all other machines in the house connect to.
->
->So something like:
->
->wan0 -> wan
->eth0 -> lan
->
->The relevant forwarding/NAT rules are:
->
->
->#iptables -A FORWARD -i wan0 -o eth0 -m state --state RELATED,ESTABLISHED -j
->ACCEPT
->#iptables -A FORWARD -i eth0 -o wan0 -j ACCEPT
->
->#iptables -t nat -A POSTROUTING  -o wan0 -j MASQUERADE
->
->
->So pretty standard boring NAT.
->
->Lag is occurring (between 75ms and 100ms) on all forwarding rules.  Apart
->from the lag they function fine (no connectivity issues).
->
->
->Ping: LAN Machine -> Debian Router = ~0.7ms
->Ping: Debian Router -> Google = ~20ms
->Ping: LAN Machine -> Google = ~121ms !!!
->
->
->The Debian server has plenty of free RAM, the load is showing as low,
->it's (at this time) entirely dedicated to routing - Why is it
->introducing 100ms of lag into forwarded traffic???
->
->Anyone else seen similar to this???
 
Have you tried running a traceroute and seeing what the results there are? 
That might help you pinpoint where the lag lies.  Just a thought.  Feel free
to correct my assumption. 
 
 
 
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