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VanLUG Email Archive

Re: ADSL and Linux router?

Brian Edmonds
06 Oct 1998 15:33:54 -0700

On Tue, 6 Oct 1998, Ben Holt wrote:
> From my understanding you can purchase additional IP addresses for use
> with ADSL (check with your ISP) for something like $5 each/month.

According to the docs that came with my signup package this is true.
For someone with a sliver of technical ability, however, it will quickly
be cheaper to buy an extra ethernet card and put the hub behind one
machine rather than in front of all of them.

To the original poster: I did a talk on setting up a Linux network with
NAT at a VanLUG meeting a couple months back. My slides are available
at http://www.cs.ubc.ca/spider/edmonds/ubc/linux-gw.ps

Curt Sampson <
> writes:
> I don't know if you can do this, but certainly just putting your ADSL
> modem on a hub and having two or more machines on it, each DHCPing its
> own address, works ok.

Yup, but as soon as BCTel catches on they'll be wanting $5/machine. :)

One annoying side effect of this is you may well start leaking local
addresses if you assign your machines local IPs, say from 192.168/16.
The other day while tcpdumping my link I noticed a machine calling
itself 192.168.180.254 arping for other 192.168.180/24 machines. I
could have real fun screwing it up by putting a machine external to my
router that thinks it's something on the luser's internal net...

Brian.