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dd-wrtprovides open linux firmwares for Linksys WRT54G routers.

When experiencing when doing some p2p very slow response from internet, a customization is required to increase the ip_conntrack buffer for avoiding the nat table to be full. In order to check if this is the issue log in to the router and check for dmesg to see if you have such messages:
ip_conntrack: table full, dropping packet.

The remedy is the following:

echo "81920" > /proc/sys/net/ipv4/ip_conntrack_max
or modify under Administration/Management tab increase IP Filter Settings (adjust these for P2P) to 4096 and set timeouts to 3600