IPv6 contact for www.citrix.com - MTU problem?

[Frank Bulk]

Matthew Luckie (who developed the scamper tool) passed this on to me, which
confirms the www.citrix.com MTU issue:

$ sudo ./scamper -F ipfw -I "tbit -u 
'http://www.citrix.com/lang/English/home.asp' 2001:1890:111e:201::15"
tbit from 2001:48d0:101:501::89 to 2001:1890:111e:201::15
  server-mss 1360, result: pmtud-fail
  app: http, url: http://www.citrix.com/lang/English/home.asp
  [  0.050] TX SYN             64  seq = 0:0
  [  0.184] RX SYN/ACK         64  seq = 0:1
  [  0.184] TX                 60  seq = 1:1
  [  0.184] TX                254  seq = 1:1(194)
  [  0.328] RX               1420  seq = 1:195(1360)
  [  0.328] TX PTB           1280  mtu = 1280
  [  0.328] RX               1420  seq = 1361:195(1360)
  [  0.328] RX               1420  seq = 2721:195(1360)
  [  0.329] RX               1420  seq = 4081:195(1360)
  [  1.190] RX               1420  seq = 1:195(1360)
  [  1.190] TX PTB           1280  mtu = 1280
  [  2.901] RX               1420  seq = 1:195(1360)
  [  2.901] TX PTB           1280  mtu = 1280
  [  6.521] RX               1420  seq = 1:195(1360)
  [  6.521] TX PTB           1280  mtu = 1280
  [ 13.764] RX               1420  seq = 1:195(1360)

You can see that Matthew's server issue a PTB to the citrix server, but it
continued to send back 1420 byte packets.

Frank

-----Original Message-----
From: ipv6-ops-bounces+frnkblk=iname.com at lists.cluenet.de
[mailto:ipv6-ops-bounces+frnkblk=iname.com at lists.cluenet.de] On Behalf Of
Frank Bulk
Sent: Thursday, August 18, 2011 2:01 AM
To: 'Daniel Roesen'; ipv6-ops at lists.cluenet.de
Subject: RE: IPv6 contact for www.citrix.com - MTU problem?

If someone has FreeBSD and willing to download scamper, try this:

sudo scamper -F ipfw -I "tbit -u
'http://www.citrix.com/lang/English/home.asp' -m 1300
2001:1890:111e:201::15"

Frank

-----Original Message-----
From: ipv6-ops-bounces+frnkblk=iname.com at lists.cluenet.de
[mailto:ipv6-ops-bounces+frnkblk=iname.com at lists.cluenet.de] On Behalf Of
Daniel Roesen
Sent: Wednesday, August 17, 2011 3:04 PM
To: ipv6-ops at lists.cluenet.de
Subject: IPv6 contact for www.citrix.com - MTU problem?

Hi,

anybody responsible for IPv6 on www.citrix.com listening, or able to put
me in touch with the right persons?

It seems to run off AT&T IPv6 address space, but no proper assignment in
ARIN whoisdb.

Looks like www.citrix.com has MTU problems... I fail to browse the page
from my dualstacked home site here. Anybody else able to replicate
problem?

Best regards,
Daniel

-- 
CLUE-RIPE -- Jabber: dr at cluenet.de -- dr at IRCnet -- PGP: 0xA85C8AA0