->    
   ->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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