FreeBSD tunnels / performance et'al (gif/tun etc.)
From: Karl Pielorz (kpielorz_at_tdx.co.uk)
Date: 01/20/04
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Date: Tue, 20 Jan 2004 22:07:24 +0000 To: freebsd-questions@freebsd.org
Hi All,
I've just setup a FreeBSD tunnel (we've tried both gif and tun [via
nos-tun]) now between two fairly large networks of machines...
We've routed multiple class C networks over the tunnel - only to find the
performance is, basically abysmal :(
If I do a transfer from the machines 'wan' facing addresses directly, it
works fine [we get about 230Kbytes a sec, on a 2mbit link between the
hosts] - if I do a transfer from machine to machine via the tunnel endpoint
IP's - we get about 140-160Kbytes a second...
But 'general' traffic going across the link gets really lousy rates, and
seems very 'staccato' (e.g. a few hundred bytes per second to a host).
We've been careful re. MTU sizes by deploying tcpmssd where needed (e.g.
for gif)
Has anyone got any experience of routing large networks of traffic via
tunnels under FreeBSD?
As a comparison a linksys vpn box did the same thing for a single VPN and
got nearly 200k with one host, and degraded 'fairly' with others online
[but unfortunately doesn't have the support for multiple networks over the
VPN etc. that we need].
Any help, info, or experience greatly appreciated...
-Karl
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