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Subnet Mask & RAS

Posted on 1997-02-20
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Last Modified: 2013-12-28
I'd like to set as subnet mask on clients accessing a ras server (nt4) the mask 255.255.255.128 (on the server this is the mask). I get instead 255.255.0.0. How can I change this ?
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Question by:hyperguy
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Expert Comment

by:ptrout
ID: 1776734
Are you using DHCP to assign IP addresses to your dial in clients, or are you using a static pool of addresses?
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Author Comment

by:hyperguy
ID: 1776735
Ptrout, I gave a static address pool of two addresses.
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Accepted Solution

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ptrout earned 100 total points
ID: 1776736
Using Windows NT as the RAS client, the only way to set the subnet mask is to use DHCP to assign the IP addresses for the dial in clients.  When you create the DHCP scope, you can configure it to provide the subnet mask, default gateway, etc. along with an IP address.  On the other hand, NT clients work just fine dialing into an NT RAS server with the 255.255.0.0 subnet mask.  We have an 8 modem RAS server, accessing it with NT and 95 clients, and, using a static address pool, have never had a problem with the default subnet mask.

If you are using Windows 95 as the dial in client, you can set the subnet mask in the Control Panel, Networks, TCP/IP properties.

There is a problem with the WINS service locating domain controllers via RAS.  Sometimes, the client willn ot send out the request to the WINS server for the address of the Domain Controller.  When this happens, you will get a "Domain Controller could not be found" type of error message on your dial in client.  This is not related to the subnet mask.  Microsoft acknowledges this as a problem, but hasn't provided a fix for it.

I hope this helps.
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Author Comment

by:hyperguy
ID: 1776737
PTRout, I did what you said:

Installed DHCP server and set 255.255.255.128 as the subnet mask.
I cannot, as you suggest, assign a subnet mask on the client, as doing this would mean to use a fixed IP which is not what I want.

The client, even after using DHCP, always has a subnet 255.255.0.0 which does not let me reach a particular server on our internal net.

Sorry, can't give you the points yet !

Thanks for the help anyway
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