I've seen a similar issue when I've had an ssh connection open to a
remote site over a VPN connection (not a VPN client on my PC, but a
VPN connection between my site and the remote site, between Cisco
routers). Catting a large file would hang the connection, and I had
to kill and re-establish the connection. The issue was that the
maximum packet size over the VPN link was something like 1460. The
VPN connection added 40 extra bytes of payload. When I would cat a
large file, my computer would send 1500 byte packets with the do-not-
fragment bit set. The routers couldn't pass the 1500 byte packet
because it was too large, and the do-not-fragment bit prevented them
from fragmenting the packet, so it would get dropped, and my
connection would die. I don't remember the exact details, as it
occurred a couple years ago, but the gist was that the MTU on the
servers I had to connect to had to be reduced to something like
1460. I don't think this is exactly your situation, but it's just an
idea of something to consider.
-Tim
On Jul 12, 2007, at 9:46 AM, Matt Shields wrote:
I've noticed this in CentOS 4 & 5 and Fedora 5 & 6. If I'm in Gnome
desktop and using any of the terminal programs and I ssh into any
server, the connection just hangs. Not drops, it just hangs and
doesn't recover.
These servers are all over the country on different ISPs in Tier1
datacenters. Some are in our office, so they are on the local lan.
We have a mix of RHEL 3, 4 & 5 and CentOS 4 & 5 on the servers. If
I'm using a windows computer with putty or SecureCRT this never
happens, it only happens when I'm using any of our linux desktops or
laptops. It doesn't matter if I'm in the office or at home (on
comcast) or over at a friend's house (verizon dsl). This problem has
been going on for at least two years and I'm finally fed up to the
point where I might switch back to windows since 99% of my job is
working while ssh'ed into servers.
Anyone had similar problems?
-matt
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