Re: GRE Tunnels Issue

If you set MTU on the interface the packets exceeding this will be
dropped without sending ICMP unreachables. To notice a host to adjust
MSS, you must use other methods. Since TCP MSS adjustment is not
supported on N7k, there is some dirty workaround for this:

https://supportforums.cisco.com/thread/2052165

Regards,
Piotr

On 11/4/13 7:03 PM, sulman naseer wrote:
> Hi Piotr,
>
> Thanks for answer. I am able to implement this command only on cisco
> 3750e but not able to found in Cisco Nexus 7K under interface tunnel
> x. And how much same bytes do you recommend on both side interfaces.
> For example. If i use 'ip tcp adjust-mss 1436 on cisco 3750 and mtu
> 1436 on Nexus 7K will make sense or not.
> looking for next response.
>
>
>
> > Date: Mon, 4 Nov 2013 17:18:37 +0100
> > From: pitt2k_at_gmail.com
> > To: n_sulman_at_hotmail.com; ccielab_at_groupstudy.com
> > Subject: Re: GRE Tunnels Issue
> >
> > Hi Sulman,
> >
> > This is MTU issue. Use 'ip tcp adjust-mss' command on the tunnel
> > interface to make http work better.
> >
> > Regards,
> > Piotr
> >
> >
> > On 11/4/13 4:03 PM, sulman naseer wrote:
> > > Dear Group,
> > >
> > > In need help in my implementation scenario like
> > > We are implementing P2P GRE Tunnels from Head Office to Our
> Branches(20 Branches) over MPLS VPN Cloud.
> > > For test purpose, we implement P2P GRE tunnel in ip mode from Head
> office with 2 branches but after that we are facing slow internet
> browsing issue(But not very slow). From Branch end Client to Head
> office Data Center, Ping response are very good but browsing is very
> slow. As we route traffic through MPLS cloud again mean shutdown GRE
> Tunnels then internet browsing better then before.
> > > As i think may be the MTU issues with GRE but not sure. So need
> guidance to resolve this issue permanently.
> > >
> > > Note: In HO we have Cisco Nexus 7k and in Branches we have Cisco
> 3750e Switches.
> > >
> > > Thanks
> > >
> > >
> > > Blogs and organic groups at http://www.ccie.net
> > >
> > >
> _______________________________________________________________________
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Received on Mon Nov 04 2013 - 19:19:19 ART