[c-nsp] ip tcp adjust-mss

[Aaron]

At the interface level.


On Mon, Feb 11, 2013 at 3:58 PM, Eric A Louie <elouie at yahoo.com> wrote:

> Ok, maybe I'm missing the obvious, but within my backbone, I can't just
> increase
> the MTU across the Ethernet links.
>
> router (config-if)#ip mtu ?
>   <68-1500>  MTU (bytes)
>
> Unless this is the mtu you refer to
> router (config-if)#mtu ?
>
>   <1500-9800>  MTU size in bytes
>  Much appreciated, Eric
>
>
>
>
> ________________________________
> From: Saku Ytti <saku at ytti.fi>
> To: cisco-nsp at puck.nether.net
> Sent: Mon, February 11, 2013 12:33:53 PM
> Subject: Re: [c-nsp] ip tcp adjust-mss
>
> On (2013-02-11 11:56 -0800), Eric A Louie wrote:
>
> > Is anyone else using this method of "mtu control"?  I need some support
> - my
> >CEO
> >
> > is asking why I have to do this, and who else does it, and is it a common
> > practice, etc, so I'm looking for evidence, more than just "The Cisco
> TAC told
>
> > me to do it".
>
> Very common hack to deal when tunneling is involved in middle of the
> network, and reducing client MTU is not practical. But I'm really surprised
> you'd need it in this situation, usually you can increase your core MTU to
> carry MPLS labels while still delivering customers 1500B.
>
> Mostly while quite ugly hack, it just works. Sometimes you run into some
> poor application which send MTU size UDP frames and expect them to be
> delivered, those customers would not be happy.
>
> --
>   ++ytti
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