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How would you translate X.25 traffic from X.25 PAD to IP network frame relay traffic

Posted on 2003-03-25
Medium Priority
Last Modified: 2013-12-12
I have an X.25 network with PADs we want to convert this traffic to framerelay (TCP/IP) traffic. using a cisco router....
the router should recieve the X.25 on one serial interface and convert it to IP and encapsulate it in frame relay on another serial.... also it should do the opposite
The router should switch each SVC to the correct IP address... and switch the packets with certain IP address to the correct SVC.

My regards
Question by:hamed78

Expert Comment

ID: 8212938
This is not a translation. Frame Relay and X.25 are layer 2 protocols and Ip is a layer 3 protocol. Let's gonna say that the ip packet is encapsulated inside the frame relay or x.25 frame. Then, if you have a serial interface correctly configured with x.25 and another serial interface with frame relay, and you also made the correct mapping for all the ip networks, or if a routing protocol is correctly configured, including all the networks. You should not have any problem. Also you should check if you have any access list configured in your router.
This is the process:
-You receive a frame in your x25 interface
-the frame is discarded, now you have an ip packet
-the router look at your routing table for an outgoing interface, or a default one.
-if the outgoing interface is your frame relay one, it will encapsulate the ip packet in a frame relay one and sent it out.
-the frame will be discarded in the other end.


Author Comment

ID: 8216547
OK ElmoROn ,
but what about the parameters you should look for in the X.25 to map them to the TCP/IP netwrok over the frame relay link.

Also, what is the necessary information we should know about the x.25 devices, configuration...etc?

Expert Comment

ID: 8225546
PADs have no IP address. So, there is no way to route the PAD packets on our IP network. Nortel routers have a feature called IPEX (IP Encapsulation of X.25) that "tunnels" X.25 packets over the IP cloud:
 I tried to find the same feature on Cisco but had no success.
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Author Comment

ID: 8232975
i found many commands on cisco IOS to translate from tcp tp x.25 and vice versa would these help?

Expert Comment

ID: 8240231
Maybe you can use the XOT feature (X.25 over TCP/IP). It was designed to encapsulate X.25 over a IP cloud, but with both end-point as X.25 devices. I don't know if it is your demand.
You can see more details on page:


Author Comment

ID: 8243353
The case is about an x.25 network, that will terminate in IP netwrok using frame-relay encapsulation.. and the same thing the IP traffic will be ter5minated on the x.25 netwrok.....

Expert Comment

ID: 8245486
Well, you can use protocol translation. Suppose the X.25 address of you router is 12345 and the IP of the host you want to connect is

translate x25 12345 tcp

Every call arriving will cause your router to open a Telnet session to your host. All data coming from the X.25 call will be send to the host by the Telnet session and vice-versa. Your application will have to filter the Telnet control commands.

Accepted Solution

cruzeiro earned 500 total points
ID: 8245491
LVL 79

Expert Comment

ID: 8409888
G'day, hamed78
No comment has been added lately (26 days), so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area for this question:

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