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RE: RE: MTU issues in MPLS VPN Network

  • From: "kartik" <kartik.kashyap@estelcom.com>
  • Date: Fri, 28 Nov 2003 18:20:24 +0530
  • Cc: <mpls-ops@mplsrc.com>
  • Importance: Normal
  • Resent-Date: Fri, 28 Nov 2003 08:20:07 -0500
  • To: "sanjaykrishna" <sanjaykrishna@telstra.com>
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Dear Sanjay

Intially what was the mtu of your clients proxy server.Since you have made
the mtu on all interface as 1550 did you try by reverting the mtu to
original mtu from 1400 bytes.

Regards
kartik


-----Original Message-----
From: sanjaykrishna [mailto:sanjaykrishna@telstra.com]
Sent: Friday, November 28, 2003 11:07 AM
To: kartik.kashyap@estelcom.com
Cc: sanjaykrishna@telstra.com; mpls-ops@mplsrc.com
Subject: Re: RE: [MPLS-OPS]: MTU issues in MPLS VPN Network




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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