[158999] in North American Network Operators' Group
Re: Simple/best tool to verify PMTUD?
daemon@ATHENA.MIT.EDU (Job Snijders)
Wed Dec 19 04:37:38 2012
From: Job Snijders <job@instituut.net>
In-Reply-To: <-500116504420455881@unknownmsgid>
Date: Wed, 19 Dec 2012 11:37:30 +0200
To: Christopher J. Pilkington <cjp@0x1.net>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Hi,
On Dec 18, 2012, at 7:59 PM, Christopher J. Pilkington <cjp@0x1.net> =
wrote:
> I'm looking for a simple tool to verify PMTUD is usable along a
> particular path. Ideally this tool would be cross-platform, or run on
> Linux or Windows.
>=20
> I've done some testing of my own by hand, but hoping a tool would help
> the admin on the other side be able to test for themselves.
Scamper is a really cool tool, look at this example:=20
job@Alice:~$ sudo scamper -c 'trace -P UDP-paris -M' -i 8.8.4.4 =
2001:67c:208c:10::1
traceroute from 2a02:d28:666::69 to 2001:67c:208c:10::1
1 2a02:d28:666::1 0.247 ms [mtu: 1500]
2 2a02:d28:5580:666::a 1.085 ms [mtu: 1500]
3 2a02:d28:5580:1::31 7.141 ms [mtu: 1500]
4 2a02:d28:5580:1::21 6.588 ms [mtu: 1500]
5 2a02:d28:5580::1:411 6.815 ms [mtu: 1500]
6 2001:7f8:1::a501:2414:2 7.612 ms [mtu: 1500]
7 2001:9e0:0:2::2 9.793 ms [mtu: 1500]
8 2001:9e0:0:3::2 8.277 ms [mtu: 1500]
9 2001:9e0:0:9::2 8.851 ms [mtu: 1500]
10 2001:9e0:411:1::10 9.015 ms [mtu: 1500]
11 2001:67c:208c:10::1 20.220 ms [mtu: 1464]
traceroute from 78.152.42.69 to 8.8.4.4
1 78.152.42.65 0.230 ms [mtu: 1500]
2 78.152.42.1 0.253 ms [mtu: 1500]
3 78.152.44.89 6.693 ms [mtu: 1500]
4 78.152.34.14 6.906 ms [mtu: 1500]
5 78.152.44.95 6.705 ms [mtu: 1500]
6 195.69.144.247 7.207 ms [mtu: 1500]
7 209.85.248.116 7.183 ms [mtu: 1500]
8 209.85.255.60 7.416 ms [mtu: 1500]
9 216.239.49.28 12.922 ms [mtu: 1500]
10 *
11 8.8.4.4 10.481 ms [mtu: 1500]
job@Alice:~$=20
Kind regards,
Job=
