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Strange DNS problem

Name: Anonymous 2006-02-23 7:47

The basic setup at my house is a DSL modem connected by USB to my flatmate's computer (it's the more convenient one to the phone jack), then WinXP's built-in internet sharing giving me net access on this machine.

It's been working fine for around a year, but just recently I've had major problems with resolving domain names on my box, while the net continues to work fine on my flatmate's. A reset of my machine does nothing, but a reset of his fixes the problem for a couple of hours before it occurs again.

I've tried restarting the DNS service on his machine when the problem happens, but no luck. We both run ZoneAlarm Pro but neither of us have made any changes to the settings, so a firewall problem seems unlikely.

Can anyone possibly come up with some suggestions as to what might be wrong? For reference, my flatmate's box is running WinXP SP2 and I'm running SP1.

Name: Anonymous 2006-02-24 21:59

OP once more. This is possibly related: Ethereal has shown a large number of unusual DNS requests being sent out from my flatmate's machine to my ISP's DNS servers. They're unusual in that they're "Standard query PTR [name]" instead of the "Standard query A [name]" that DNS requests being sent from Firefox and IE are.

Should I be worried about this? Could it be at all relevant?

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