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

[Daniel Roesen]

Hi,

On Fri, Aug 19, 2011 at 02:41:38PM -0500, Frank Bulk wrote:
> 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.

Nice. And of course no reaction to my notice via the web form yet
(I haven't found an email address to mail to).

So, anybody got IPv6 contacts at AT&T? After all, www.citrix.com is
using (unassigned) AT&T address space...

Best regards,
Daniel

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