Link to home
Start Free TrialLog in
Avatar of Lance McGrew
Lance McGrewFlag for United States of America

asked on

NETWORK MASK USING 255.255.255.248

We have a customer who has their T-1 provided by Paetec.   Paetec also provides our T-1 service.  As it turns out, our customer is on the same subnet as we are.  Both of us are on 63.252.84.xxx and problem is they cannot reach our webserver.   Paetec suggested we change our network mask from 255.255.255.0 to 255.255.255.248 to fix the issue.

I would love a clear understanding of why this will make it all workable?   Paetec could not or would not explain, just said do it.
ASKER CERTIFIED SOLUTION
Avatar of Todd Gerbert
Todd Gerbert
Flag of United States of America image

Link to home
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial
Avatar of kf4zmt
kf4zmt

The subnet mask is what separates the host part of an ip address from the network part.  It looks like in your case your isp has split a class b network into multiple subnets to assign out to their customers.  When both you and your customer use the correct subnet mask, you won't actually be on the same subnet. Unless of course your isp has made a mistake but this is unlikely.