[96389] in North American Network Operators' Group
Re: barak-online.net icmp performance vs. traceroute/tcptraceroute,
daemon@ATHENA.MIT.EDU (Joe Maimon)
Mon May 7 14:07:19 2007
Date: Mon, 07 May 2007 14:05:17 -0400
From: Joe Maimon <jmaimon@ttec.com>
To: Jo Rhett <jrhett@svcolo.com>
Cc: "Steven M. Bellovin" <smb@cs.columbia.edu>,
Lincoln Dale <ltd@interlink.com.au>, "'nanog'" <nanog@merit.edu>
In-Reply-To: <13310869-6681-43A4-960D-31C033BDCFBC@svcolo.com>
Errors-To: owner-nanog@merit.edu
Jo Rhett wrote:
> On May 6, 2007, at 6:07 PM, Joe Maimon wrote:
>
>> Of course, and thats why I have cut down ip mtu and tcp adjust mss
>> and all the rest.
>> Not making much of a difference.
>
>
> Um.. sorry if you mean more than you said, but where did you cut down
> the TCP MTU? If you did it on your routers, then you are creating or
> at least complementing the problem.
On the CPE dialer interface.
On the ezvpn dvti virtual-template
>
> The only way to make smaller MTUs work is to alter the MTU on both the
> origin and destination systems. Altering the MTU anywhere along the
> path only breaks things.
Lower than 1500 mtu always requires some kind of hack in real life.
That would be the adjust-mss which is the hack-of-choice
