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Re: RE: MTU issues in MPLS VPN Network

  • From: sanjaykrishna <sanjaykrishna@telstra.com>
  • Date: Fri, 28 Nov 2003 15:36:49 +1000
  • Cc: sanjaykrishna@telstra.com, mpls-ops@mplsrc.com
  • Resent-Date: Fri, 28 Nov 2003 00:43:44 -0500
  • To: kartik.kashyap@estelcom.com



Hi kartik,

We are using 1550 bytes on all the MPLS enabled devices.

I was wondering if its is related to DF bits ? We changed
clients proxy server mtu to 1400 bytes and all worked ok .

But we had some MPLS interfaces on 1500 bytes but changed to all
1550 bytes now.

Thanks
Sanjay


----- Original Message -----
From: kartik <kartik.kashyap@estelcom.com>
Date: Friday, November 28, 2003 2:25 pm
Subject: RE: [MPLS-OPS]: MTU issues in MPLS VPN Network

> Dear Sanjay
> 
> What is the MTU size your are using on all the MPLS enabled 
> interfaces.
> Regards
> kartik
> 
> 
> -----Original Message-----
> From: sanjaykrishna [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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