[CentOS] Gnome Terminal and xterm problems

Tim Meanor timspam at meanor.net
Mon Jul 16 00:17:06 UTC 2007

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.


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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