Weird LAN Event

[M. T]

Over this past weekend, I changed our netmask from
255.255.255.0 to 255.255.240.0. Now on a few DHCP XP
Pro. (within a domain) client machines, after x amount of
hours, when they attempt to logon to a shared resource
they are prompted for a username/password. And EVEN THE
DOMAIN ADMIN. account will nto let them in. But yet I
can still ping the machines IP and/or computername. And
if I logoff and log back on (not shut down) the LAN
resources are restored...???????


This is only happening on a few XP pro. boxes and not on
others. As well not on 2000 boxes.



Thank's in advance

 

[Jason]

Would that work. I would have thought you could only use (amongst other
combinations) 255.255.0.0 or 255.255.255.0. Others I can think of are
255.0.0.0 and don't know about 0.0.0.0

 

[Steve Winograd [MVP]]

Would that work. I would have thought you could only use (amongst other
combinations) 255.255.0.0 or 255.255.255.0. Others I can think of are
255.0.0.0 and don't know about 0.0.0.0

255.0.0.0 (Class A), 255.255.0.0 (Class B), and 255.255.255.0 (Class
C) are certainly the most widely used subnet masks, Jason. However,
the subnet mask can be other values consisting of a group of 1's
followed by a group of 0's, as described here:

RFC 1878 - Variable Length Subnet Table For IPv4
http://www.faqs.org/rfcs/rfc1878.html
--
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

Please post any reply as a follow-up message in the news group
for everyone to see. I'm sorry, but I don't answer questions
addressed directly to me in E-mail or news groups.

Microsoft Most Valuable Professional Program
http://mvp.support.microsoft.com

 

[M. T]

So changing them back to 255.255.255.0 will resolve this?

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