[CentOS] Gnome Terminal and xterm problems

Matt Shields mattboston at gmail.com
Mon Jul 16 00:24:48 UTC 2007

Interesting, we use OpenVPN heavily, but we also have a lot not behind
the vpn.  That will be something to test out, I haven't kept track of
which servers it happens with.


On 7/15/07, Tim Meanor <timspam at meanor.net> wrote:
> 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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