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Strange Problem fixed (kindof) with Ping

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by switchoff_b

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One of our users PC is able to access the internet for about 15 minutes and the stops, hangs up, or just can't find the proxy anymore. If you ping the proxy server it will time out (no one else is having this problem btw), but if I ping our file server it comes back fine and then when i ping the proxy server again, everything is fine and she can continue to use the internet for about another 15-30 minutes. Anyone know why this is happening and what i can do to resolve it? for a short term fix imade a static entry in the arp table for our proxy server but for the life of me i can't figure out why it's doing this.

Thanks!

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by joseph moore

Check the ARP cache on the user PC when the dropoff happens. From the Command PRompt type in:

ARP -a

I bet what is happening is the user PC has dropped its ARP resolution for your internal switch. Therefore, the user PC can't find the switch,so it can't find the proxy, so it can't find the Internet.

When you PING the file server, it forces the user PC to find the switch, which fixes the routing.

If this is the case, I would install a new NIC in the user PC first, and see if that takes care of things. If not, a static APR entry on the user PC pointing to the switch might help.

Good luck.

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