Re: IP Routing problem after enabling MPLS?

From: Abhishek Mittal <ask4mpls@yahoo.com>

Date: Wed, 22 Sep 2004 21:54:46 -0700 (PDT)

Resent-Date: Thu, 23 Sep 2004 01:24:38 -0400

Hi Garry,

That's why I was asking the complete situations with all the config templates on your router.

I assume that your customers have the PPP connections with your PE3 & they were not able to transverse the packets due to mismatch of MTU size at CPE.Typically on PPP (if you use the Linux/WIN98 only) MTU should be 1492 because on FE you can set maximum MTU size upto 1526 due to Ethernet framing convention (with 14 bytes headers).

For Win98-OS PPP connection has it's own limitation to set the MTU size, I suppose.

To overcome this problem , we also use MTU 1492.

Thanks & Regards

Abhishek Mittal

Garry Glendown <garry@regio.net> wrote:

Garry Glendown wrote:
> 08:26:08.241047 customer.23603 > server.ftp: S 1279761092:1279761092(0)
> win 5840
> ^^^^
>
> Why is mss set/forced to this just because MPLS routing is active? Also,
> changing the mss-adjust to anything else still results in the mss of
> 1432 arriving at the server ... !? Is this documented behaviour?

OK, another mystery - the customer who's been bugging me now for the
last couple days still had problems - checking the connections initiated
from him, I found that all the connections were opened with mss 1452,
ignoring the settings from the template, as well as not being modified
by the other mss of 1432 --- I had to update their MTU to 1492, which
finally got them to work again ...

Does everybody have problems like thi! s with MPLS???

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Re: IP Routing problem after enabling MPLS?