PPP RAS Adapter

[Craig Barraclough]

I have a VPN server setup when i do an ipconfig and extra
adapter appears a "PPP Adapter RAS Server" with a valid ip
address on our range but a broadcast subnet mask
255.255.255.255
The problem is when our clients connect via vpn the connect
and authenticate ok but they are unable to access anything
further than the ras server.
I have done an ipconfig on one of the clients and it shows
a PPP adapter with a valid ip address i.e. 192.168.253.x
but it has a 255.255.255.255.
Our network is 192.168.253.x subnet 255.255.255.0
The client and server are therefore on different networks?
i guess this is why they can't communicate?
We are using dhcp to assign ip addresses to clients, the
ras server is 2000 server.
How is the PPP adapter assigned a 255.255.255.255 subnet mask?

 

[Bill Grant]

What you are seeing is a host route. If you do a route print instead
of an ipconfig you will see the true situation. The client has a
point-to-point connection to the server. It does not work like a normal
network link. For more details see KB 254231 . But this is probably nothing
to do with your problem.

Because the remote client and the server have addresses in the same IP
subnet but are not really in the same segment, the server acts as a proxy
for the client so that it can connect to LAN machines. Can you ping a LAN
machine from the remote client by its IP address? If you can, the routing is
working as it should.

If you can ping by IP but not by name, your problem is name resolution.
Because the link does not carry broadcasts, you cannot resolve names by that
method. You need to use either Netbios names (WINS or lmhosts files) or DNS
style names (DNS or hosts files).

 

[Craig Barraclough]

thanks for the reply

I think the problem is being caused by something else on
the network. Some client connect with no problems, others
can authenticate to the network but not ping anything by
either ip or hostname.
whats seems to work is deleting the vpn connection on the
client and recreating it again.
Could authentication be causing a problem? or would that
stop the vpn connecting at all?
The RADIUS server and RAS server are the same machine,
would that cause problems?
Anything else i could test?
I am really stumped on this as i thought it was a routing
problem but it can't be if some clients have no problem and
others do.