[Tickets #4814] Re: vlad.horde.org timeout after EHLO

Fri Dec 29 17:07:00 PST 2006

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Ticket URL: http://bugs.horde.org/ticket/?id=4814
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 Ticket             | 4814
 Updated By         | cbs at cts.ucla.edu
 Summary            | vlad.horde.org timeout after EHLO
 Queue              | Horde.org Servers
 Type               | Bug
 State              | Unconfirmed
 Priority           | 2. Medium
 Owners             | 
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cbs at cts.ucla.edu (2006-12-29 17:07) wrote:

This thread might be relevant:

http://msgs.securepoint.com/cgi-bin/get/postfix9904/37.html
http://msgs.securepoint.com/cgi-bin/get/postfix9904/37/1.html

Basically, it looks like something in the path is filtering ICMP, and
broke PMTU discovery.

I tested by sending ICMP echo request packets with varying sizes. 
Anything over 1480 bytes for the total packet size was dropped.  I tested
from two different network paths, to verify that it wasn't something on my
end.  The two routes share the last 4 hops only:

19  154.11.4.129  36.329 ms  36.818 ms  36.967 ms
20  208.181.86.221  37.716 ms  39.063 ms  41.819 ms
21  209.53.254.36  43.078 ms  41.967 ms  41.206 ms
22  199.175.137.231  38.667 ms  38.190 ms  36.957 ms

and:

 7  154.11.4.129  143.938 ms  144.835 ms  144.333 ms
 8  208.181.86.221  197.612 ms  148.102 ms  145.105 ms
 9  209.53.254.36  145.927 ms  144.991 ms  145.115 ms
10  199.175.137.231  145.803 ms  148.961 ms  147.354 ms