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Subnet Mask "Slippage"

By jb14808 ·
What could cause the subnet mask of a Wintel machine on a large network to "Slip" its subnet mask bits?
The machines in question will be assigned an IP address from the Win2K DHCP Server and work fine for a while but then the Subnet mask, nothing else, will "slip" from a 24 bit to an 8 bit Mask. It's happenned on various machines. It hasn't happened on our Macs or Cisco stuff. It only happens to Clients of the DHCP server and then, not all of them.

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Subnet Mask "Slippage"

by jb14808 In reply to Subnet Mask "Slippage"

It's in the scope that I'm serving. It's on the same switch as other comparable machines that don't exhibit this behavior. Access-List is blocking DHCP traffic out to the 'Net. Releaes All, then Renew all clears the problem up reliably. You sound like you're on to something. What are you thinking?
PLEASE REPOST!!!!

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Subnet Mask "Slippage"

by Paul D. Masley In reply to Subnet Mask "Slippage"

JB:

This is an off of the wall question. Has your system been through a lightning strike or power surge? Not your users, but your server (room). If so, check the NIC's. I had a similar problem, but more intense. My users were loosing ther complete IP addresses. I found that the backup power supply had been hit in my server room. Now, this did not affect all users. Only users that had Intel NIC's were affected. The 3Com users were fine. This screwed with me until I had a weekend alone, with a bottle of jack , and tore into the whole damn thing. Check your NICS.

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Subnet Mask "Slippage"

by Shanghai Sam In reply to Subnet Mask "Slippage"

EXACTLY!! That was the problem!! I replaced the NIC and Boom! Rock and roll!

I had thought to do this a while ago, but I wanted to confirm. Excellent Job!

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Subnet Mask "Slippage"

by jb14808 In reply to Subnet Mask "Slippage"

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