From: Joseph Brunner (joe@affirmedsystems.com)
Date: Mon Feb 11 2008 - 17:31:27 ARST
Speed duplex mismatch somewhere...
Wrong mtu on tunnel/lan facing interfaces (should be ip mtu 1412, ip tcp
adjust-mss 1360)... forcing fragmentation in the process path (although it
wouldn't be 10pps)
Run a iperf test (google iperf and dnld)
-Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Jian
Gu
Sent: Monday, February 11, 2008 1:37 PM
To: ccie forum
Subject: Traffic extremely slow in one direction
hi, all,
I have a real world problem that I am scratching my head to find the root
cause. We have a local data center at site A and a remote backup server at
site B, site A and site B has its own service provider, the connection
bandwidth is well above 50M in either site, traffic will traverse a
GRE/IPsec tunnel which is configured between two 2800 routers, both routers
have hardware accelerated IPSec encryption/decrytion module installed.
It is interesting that traffic from site A to site B is extremely slow,
performance is only around 10s packets/second, but FTP transferring data
from site B to site A is reasonably fast, which is around 8Mb/sec. I am
pretty sure service provider of site A is not rate limiting incoming traffic
(even it does, noway they will rate limit to 10s packets/sec). What could be
the root cause of such poor performance, any server experts here can give me
a clue?
Thanks,
Jian
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