multi-subnet periodic floating internet access failure

[lanclass]

The Problem:
periodically on several different subnets a PC (win98, or XP or 2K) will fail to browse the internet, or send and receive mail. I can change the IP address to one never used and bingo the network is available again, then next day I can set the IP back to the one not working and it will work.
The Network:
Moderate sized network, Netgear fvs318 from LAN to Inet, Cisco routers (mostly 2600) internal 56kbs links seven subnets 10.based ip addressing scheme. less than 100 total devices all with static IP addresses. RIP used on all Cisco routers, Static routes on the fvs318 to the gateways out of the base subnet to the other subnets. 2 Win 2k servers with ADSI and DNS services configured, Internet email on Sun Unix box (I don;t control or know about that package).
Any suggestions appreciated.

 

[manarth]

any chance of a rogue DHCP server providing a conflicting IP address?

when the machine dies, what's the "ipconfig /all" settings? do they match your network?

and most of all:
do you get any error messages?!


<marc> i wonder what will happen if i press this...[ul][li]please give feedback on what works / what doesn't[/li][li]need some help? how to get a better answer: faq581-3339[/li][/ul]

 

[lanclass]

Thanks for the suggestion. Not sure if a DHCP server could be an issue since all devices are assigned static IPs. I think the ipconfig is going to show all ok, but I will check that out. The odd issue is that the failing PC will function normally (usually) on their own subnet, they only fail to get out to the internet. I have been able to ping the netgear router/firewall from a failing PC, but cannot ping either of the Win2k DNS servers (on the same subnet as the firewall).