[c-nsp] ip tcp adjust-mss <value> - Alternative?

[Arie Vayner]

Another thing to look at (it's not perfect, but it's something) is
"Automatically Adjusting the IP MTU".
Look at this document on CCO:

http://www.cisco.com/en/US/partner/tech/tk801/tk703/technologies_tech_note09186a0080094c4f.shtml

Arie
CCIE #12198

On 7/1/05, Ran Liebermann <ranmails at gmail.com> wrote:
> Hi Chris,
> 
> I agree.
> Indeed this is a method I like the least (unsetting the DF bit), but
> some vendors, at least in the BRAS solutions, used to provide just
> this option.
> 
> In our network we make sure that all paths that a tunnel can go
> through will support MTU larger than 1500 bytes plus the tunnel header
> overhead.
> 
> (I just noticed that we replied eachother off-list, so I put it back
> on the list).
> 
> --
> Ran.
> 
> 
> On 29/06/05, [A] <chris at akko.id.au> wrote:
> > Hi Ran,
> > Thanks for your response. Apart from effectively disabling PMTUD itself,
> > what else if anything will clearing the df bit for only TCP packets break in
> > your experience?
> >
> > Obviously what we don't want is to cause more (or bigger) problems than we
> > actually fix by implementing something like this...
> >
> > Regards,
> > Chris
> >
> > ----- Original Message -----
> > From: "Ran Liebermann" <ranmails at gmail.com>
> > To: <chris at akko.id.au>
> > Sent: Wednesday, June 29, 2005 2:26 PM
> > Subject: Re: [c-nsp] ip tcp adjust-mss <value> - Alternative?
> >
> > Either trying harder to increase the MTU throughout the tunnel's path,
> > or using a route-map to unset the DF bit in packets that have it set
> > to 1.
> >
> > Regards,
> > --
> > Ran.
> >
> > On 28/06/05, chris at akko.id.au <chris at akko.id.au> wrote:
> > > Hi list,
> > > Just wondering what other SP's use as an alternative to the "ip tcp
> > > adjust-mss" command on platforms that don't support it (e.g. the
> > > 10008ESR
> > > PRE2) for working around MTU & fragmentation issues in an L2TP/PPPoE
> > > LNS
> > > environment.
> > >
> > > Thanks in advance.
> > >
> > > Regards,
> > > Chris
> > >
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> > >
> >
> >
> 
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