-----Original Message-----
From: Don Stokes [SMTP:don@daedalus.co.nz]
Sent: Tuesday, 22 February 2000 00:51
To: adsl@freebsddiary.cx
Subject: Re: DSL asymmetry prevents VPN office-to-office connection

>should be pointed out that both cable systems and the most common
>form of DSL have an inherent asymmetry of bandwidth that prevents this
>usage.)"
>
>I am aware of the different upload/download speeds on DSL lines. But I
>see no reason why this would prevent a link. Surely the link would
>merely be at the slower (upload) speed. Is the reviewer ("Rob Slade"
><rslade@sprint.ca>) wrong?

I think his use of the word "prevent" without further qualification is
simply wrong. Oboviously 6M down, 384k up ADSL configurations at both
ends of a VPN link is only going to get you 384k across the VPN since
all VPN traffic is rate limited by the uplink at one end or the other.

The other traps of course include dynamic IP addresses
[Nick Rout] You can get fixed ip with adsl, cost depends on isp :-)
, routers that
don't handle VPN protocols (can you get GRE or ESP through an M10?)
[Nick Rout] my understanding is that non MS (ie linux/bsd) VPN's do not rely on GRE or ESP. May be wrong.

these resources may help: http://www.linuxdoc.org/HOWTO/VPN-HOWTO.html
http://www.linuxdoc.org/HOWTO/VPN-Masquerade-HOWTO.html

There was a series of articles in Linux Journal - I think Dec 99/Jan 2000 from memory on VPN under linux.
 and
so-on, but none of these represent anything like a blanket ban on VPNs
over DSL, cable etc.

The other factor is that I suspect some US cable & DSL suppliers screw
down the uplink speed more than Telecom & Saturn do.

-- don

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Received on Tue Feb 22 10:07:28 2000