nanog mailing list archives
Re: MTU path discovery and IPSec
From: Joe Maimon <jmaimon () ttec com>
Date: Thu, 04 Dec 2003 16:40:45 -0500
Tony Rall wrote:
On Wednesday, 2003-12-03 at 09:38 PST, David Sinn <dsinn () dsinn com> wrote:
<snipped>
(And note that frag 1 often is not the first fragment to arrive at downstream nodes. In my example in (1), frequently frag 2 will reach places before frag 1 does (if any router along the path reorders its transmit queue based on packet size).)
I agree with all I have snipped.I was wondering would it not be wiser for fraggers to frag in half instead of just the overflow?
For instance, suppose router has to fragment 1500 byte packet to go over 1476 GRE. Instead of having a big packet/little fragment why not just divide in half? This would give them more equal buffer treatment, but an even bigger potential win is to avoid perhaps a second (maybe ipsec?) fragmenting later on down the pipe.
Once you are going to do it, do it right. It is not as if your decreasing header overhead by producing small fragment packets. And I am assuming the whole packet is already in buffer when it comes time to fragment it.
Tony Rall
Current thread:
- Re: MTU path discovery and IPSec, (continued)
- Re: MTU path discovery and IPSec Valdis . Kletnieks (Dec 03)
- Re: MTU path discovery and IPSec Owen DeLong (Dec 03)
- RE: MTU path discovery and IPSec cproctor (Dec 03)
- Re: MTU path discovery and IPSec David Sinn (Dec 03)
- Firewall stateful handling of ICMP packets Sean Donelan (Dec 03)
- Re: Firewall stateful handling of ICMP packets Owen DeLong (Dec 03)
- Re: Firewall stateful handling of ICMP packets Valdis . Kletnieks (Dec 03)
- Re: Firewall stateful handling of ICMP packets Owen DeLong (Dec 03)
- Re: MTU path discovery and IPSec David Sinn (Dec 03)
- Re: Firewall stateful handling of ICMP packets Henry Linneweh (Dec 03)
- Re: MTU path discovery and IPSec Valdis . Kletnieks (Dec 03)
- Re: MTU path discovery and IPSec Tony Rall (Dec 04)
- Re: MTU path discovery and IPSec Joe Maimon (Dec 04)
- Re: MTU path discovery and IPSec Valdis . Kletnieks (Dec 04)
- Re: MTU path discovery and IPSec Barney Wolff (Dec 04)
- Re: MTU path discovery and IPSec Joe Maimon (Dec 04)
- Re: MTU path discovery and IPSec Valdis . Kletnieks (Dec 04)
- Re: MTU path discovery and IPSec Joe Maimon (Dec 04)
- Re: MTU path discovery and IPSec Crist Clark (Dec 04)
- Re: MTU path discovery and IPSec Joe Maimon (Dec 04)
- Re: MTU path discovery and IPSec Laurence F. Sheldon, Jr. (Dec 04)
- Re: MTU path discovery and IPSec Joe Maimon (Dec 04)
- Re: MTU path discovery and IPSec Valdis . Kletnieks (Dec 04)