[45899] in North American Network Operators' Group
Re: Satellite latency
daemon@ATHENA.MIT.EDU (David R Huberman)
Wed Feb 27 09:46:48 2002
Date: Wed, 27 Feb 2002 07:45:07 -0700 (MST)
From: David R Huberman <huberman@gblx.net>
To: Jim Mercer <jim@reptiles.org>
Cc: nanog@merit.org
In-Reply-To: <20020227093617.L516@reptiles.org>
Message-ID: <Pine.GSO.4.40.0202270744110.25202-100000@shell1.phx.gblx.net>
MIME-Version: 1.0
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Errors-To: owner-nanog-outgoing@merit.edu
Actually, it's a two-way connection, and I sent you a private e-mail, but
hey, in front of 10k folks is cool.... :>
> On Wed, Feb 27, 2002 at 07:25:52AM -0700, David R Huberman wrote:
> > My biggest pbeef is the delay while using ssh or telnet. I attribute
> > this mostly to speed of light issues. Web browsing, Remedy, and other
> > IP software seem to work acceptably fast given my expectations.
> >
> > Have you found 'tools' to assist removing delay from the typical
> > connection, especially as it relates to ssh?
>
> actually, i think the problem you are seeing is moreso related to the
> asymetric nature of the connection (i think you were referring to directway
> which is a "one-way" satelite feed).
>
> i generally only use such connections for front-ending a squid server.
>
> the problem is that the round trip routing of your packets gets pretty
> diverse. when you type the packets go out the modem, across a terrestrial
> network to the uplink, then back down over satelite.
>
> not much can be done to make that better.
>
> if you "own" the network, there are some tunneling things you can do to make
> things appear to be less asymetric, which might help, but if you are an
> end-user, you'll just have to tough it out.
>
> alternately, configure your router/etc to use the IP of your dial-up connection
> for ssh/telnet, instead of the IP of the downlink. this will make your
> telnet/ssh work using only the dial-up connection, which will eliminate the
> asymetric routing.
>
> (ie. interactive traffic uses the dial-up addr, "bulk" services use the
> downlink).
>
> --
> [ Jim Mercer jim@reptiles.org +1 416 410-5633 ]
> [ I want to live forever, or die trying. ]
>
