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RE:MTU issues in MPLS VPN Network

  • From: sanjaykrishna <sanjaykrishna@telstra.com>
  • Date: Wed, 26 Nov 2003 15:27:25 +1000
  • Resent-Date: Wed, 26 Nov 2003 01:26:16 -0500
  • To: mpls-ops@mplsrc.com


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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