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
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

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.
Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!


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:

RECOMMENDATION: Points awarded to: cruzeiro

Please leave any comments here within 7 days.



EE Cleanup Volunteer
If you feel that your question was not properly addressed, or that none of the comments received were appropriate answers,
simply leave a new comment here on how you would like to dispose of this question.

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This solves the problem of diagnosing why an internet connection is no longer working. It also helps identify the likely cause of the lost connection if the procedure fails to re-establish your internet connection. It helps to pinpoint the likely co…
Sometimes you have to pull out old tricks to get a new firewall to work… While we were installing a new Sonicwall at a customers site we found that sites they were able to visit before were not working.  It seemed random and we could not understa…
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…
In this video, Percona Director of Solution Engineering Jon Tobin discusses the function and features of Percona Server for MongoDB. How Percona can help Percona can help you determine if Percona Server for MongoDB is the right solution for …
Suggested Courses

800 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question