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RE: MTU issues in MPLS VPN Network

  • From: "kartik" <kartik.kashyap@estelcom.com>
  • Date: Fri, 28 Nov 2003 09:55:53 +0530
  • Importance: Normal
  • Resent-Date: Fri, 28 Nov 2003 08:15:13 -0500
  • To: "sanjaykrishna" <sanjaykrishna@telstra.com>, <mpls-ops@mplsrc.com>
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Dear Sanjay

What is the MTU size your are using on all the MPLS enabled interfaces.

Regards
kartik


-----Original Message-----
From: sanjaykrishna [mailto:sanjaykrishna@telstra.com]
Sent: Wednesday, November 26, 2003 10:57 AM
To: mpls-ops@mplsrc.com
Subject: RE:[MPLS-OPS]: MTU issues in MPLS VPN Network



Hi,

I am having problems sending 1500 byte packet over our mpls vpn test network
to internet.  I  have setup internet connection using a separate VPN and
have defaults inbound.


My laptop (mtu ethernet default) connects to an dot1q VLAN. This vlan is in
the internet VRF (iVRF). Internet VRF then connects to Border Router then to
upstream provider.


Laptop <--> (vlan, iVRF)PE <--->PE <---> PE <--> (vlan, iVRF) Border Router
<--> Internet

When my laptop is using default mtu I can browse some web sites and cannot
browse others. Pinging 1500 bytes drops. Changing MTU to 1400 bytes works.

How can I get my network accept default mtu from laptop?

Thanks
Sanjay Lal



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