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New Member

NAT and X Windows

I currently have to networks, one is a corp network and the other is an EBP network. The corp network is NAT'd to an address in the EBP network to access the EBP network services. This works just great, until I have to access an X Windows services which requires the Display to be exported back to the desktop. The devices that reside on the EBP network can export the display just fine. But the corp network (NAT'd) cannot export display. Is there any NAT configuration that can forward the port the xwindows application comes in on, to the requesting host on the NAT'd network. If anyone knows of a more effective way to accomplish this task your help would be greatly appreciated!!

Connecting to the host works, just not exporting the display. The port that the app tries to return on is 6000. Don't know if that helps but thought I would add it in.

2 REPLIES
New Member

Re: NAT and X Windows

X Windows is considered a NAT-sensitive protocol. A few links that might help shine some light on this are listed below.

Basically, you need to set up some sort of application-layer gateway to pass data on correctly. Hopefully the following links help.

The first link outlines some possible ways around the issue, but there are some security risks involved.

Workaround options?

http://www.zvon.org/tmRFC/RFC3027/Output/chapter3.html

Application-layer Gateways info:

http://www.cisco.com/en/US/partner/tech/tk648/tk361/tech_brief09186a00801af2b9.html

Technologies White Paper:

http://www.cisco.com/en/US/partner/tech/tk648/tk361/technologies_white_paper09186a0080194af8.shtml

NAT-sensitive Protocol info:

http://www.cisco.com/en/US/partner/about/ac123/ac147/ac174/ac182/about_cisco_ipj_archive_article09186a00800c83ec.html

New Member

Re: NAT and X Windows

Thanks for posting the links and the info. I am only able to get to the first link. The others my cisco Id does not have access to.

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