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Hi All,

I have a problem in tunneling DECNET traffic over GRE using FiberOptic
leased-line as the media in the middle of the network.

DECNET terminal - router - layer3 switch - FiberOptic - layer3 switch -
router - DECNET server

Although the DECNET packet is smaller the link mtu, I guess, I've try
to enable tunnel PMTUD (tunnel path-mtu-discovery) and configure ip mtu
1476 in the tunnel interface.

Then I tried to modify the DF-bit using ip policy route-map in the
tunnel interface. It still doesn't work.

Has anyone ever experience this problem?

Does it have something to do with the GRE Tunnel latency?

Regards,
Sali

> I have a problem in tunneling DECNET traffic over GRE using FiberOptic
> leased-line as the media in the middle of the network.

Is IP working over the GRE tunnel ?

Does CDP flow over the tunnel ?

Post a sanitized configs of both routers and the post the output from
both routers for

1. sh version

2. sh decnet

3. sh decnet interface

4. sh decnet route

5. sh decnet nei


Are Decnet hellos being exchanged over the tunnel ?

debug decnet adj

Do you have "decnet cost x" configured on tunnel interfaces ?

On 28 Mar 2006 23:25:10 -0800, sali wrote:
> Hi All,
>
> I have a problem in tunneling DECNET traffic over GRE using FiberOptic
> leased-line as the media in the middle of the network.
>
> DECNET terminal - router - layer3 switch - FiberOptic - layer3 switch -
> router - DECNET server

This wouldn't be LAT would it? That won't work (LAT) without
configuring bridging on the tunnel. In the later IOS releases bridging
isn't supported (but can be configured) on the GRE tunnel interface.


--
Linux Home Automation Neil Cherry
http://www.linuxha.com/ Main site
http://linuxha.blogspot.com/ My HA Blog
http://home.comcast.net/~ncherry/ Backup site

If it is LAT, then LAT to TCP protocol translation should be used

see Cisco doc

http://www.cisco.com/en/US/tech/tk87...801b777e.shtml

On 29 Mar 2006 08:11:47 -0800, Merv wrote:
> If it is LAT, then LAT to TCP protocol translation should be used
>
> see Cisco doc
>
> http://www.cisco.com/en/US/tech/tk87...801b777e.shtml
>

The only problem with that is it very resource intensive (memory and
CPU) and it doesn't support LAST and LAVC (sp?). It does work very
well.

--
Linux Home Automation Neil Cherry
http://www.linuxha.com/ Main site
http://linuxha.blogspot.com/ My HA Blog
http://home.comcast.net/~ncherry/ Backup site

Well if the OP is trying to run vax cluster traffic over the Internet
then all bets are off ...