you definitely need an X.121 address to map your IP address to. You need to specify your local X.25 address, and use an ´x25 map´ statement to map your address to the provider. The whole configuration needs to look like this (IP addressing is arbitrary, change that to your real IP address):
interface Serial 3/1
ip address 172.16.1.1 255.255.255.252
encapsulation x25 dte
x25 address 1234
x25 map ip 172.16.1.2 5678
x25 ltc 1024
x25 htc 1030
x25 subscribe windowsize permit 2 2
x25 subscribe packetsize permit 16 16
172.16.1.2 is the remote IP address, and 5678 the remote X.121 address.
You also need to globally enable X.25 switching with the global command ´X.25 routing´.
That should pretty much do it. Give me a shout if it doesn´t work.
Thanks a lot, that's very helpful. I still have a few questions though:
Should it be my service provider that allocates the X121 address to me then? Or do they expect me to have my own X121 address (if so, how do I obtain one. I'm in the UK)
Also, for the remote IP address - why does it need an IP address if it's purely an X25 connection? I have a number of NUAs (X121 addresses) that I need to communicate with. Does that mean that I need to have an IP address mapped to each one?
Isn't there some way that I can just say, for this NUA - use interface Serial3/1? i.e. without having to map it to an IP address?
Apologies if I've misunderstood any of the above! I've never worked with X25 before so it's all a bit strange to me!
Hmmm, not too sure I fully understand the PVCs. However, I'll have a look through the link you provided and see if I can make more sense of it.
What I still don't get though - how do I route to the NUA's (X121 addresses) they have provided for the remote end?
I have 3 remote NUA's that we want to communicate with, so presumably, as with IP, I have to set up some kind of static routes to say, for these NUAs, use this interface? Is that correct? If so, what do i need to configure here?
(I think the thing that is most confusing for me is translating between the information Cisco provide and the information our X25 provider supplies!)
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