Computer to router constantly sending and receiving packets

I have two separate computers, one wireless and one connected direct to my router. One running XP home and the other running XP pro, both will all current updates. Both computers running ZoneAlarm Pro firewall and Kaspersky antivirus and should be virus free. Both computers are constantly sending and receiving several packets to the router every second (even with internet unplugged, this is just computer to router traffic). It is svchost.exe that is doing the work. It is TCP traffic with around 200-7000 bytes of data. Sometimes when redoing the connection (power down router, unplug cable, ect…) it will quit doing it. I had the same issue with my past USRobotics router. What could be causing this? It is interfering with my ability to monitor my internet bandwidth speed and usage.
WRT54GL XPsp2

Since no one has any idea, I did some things on my own. The first thing I did was to use my computers firewall to block the destination port to each router (they were both different). The second thing I did was to update my linksys router firmware with DD-WRT. That seems to have solved it for good, as I have disabled the the firewall blocks and all is good. Freeware hacks rule.
WRT54GL XPsp2

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Dear !
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