[SLUG] A problem getting ADSL to work

[Jeffrey Borg]

You could do what I did to get satellite working using an aliases address
for outgoing stuff

say it's eth0 and eth0:0

so
route del default
route add default gw 172.24.1.1 dev eth0:0

would do the trick. (well it works on ppp links, I can not see how it
wouldn't work on ethernet)

On Tue, 23 Oct 2001, Howard Lowndes wrote:

> I have a client who has taken up an ADSL connection with Flow Comms and I
> am having the devil getting it working correctly.
>
> ASCII piccy
>
> Private network         192.168.1.0/24
>                                |
>                                |-- 192.168.1.20 (234.234.234.235)
>                            eth0|                      (alias)
>                    -------------------------
>                    |      192.168.1.1      |
>                    |   (234.234.234.234)   |
> Linux Box          |        (alias)        |
>                    |                       |
>                    |                       |
>                    |      172.24.1.2       |
>                    -------------------------
>                            eth1|
>                                |
>                       ^^^^^^^^^^^^^^^^^^^
> ADSL Service Provider     172.24.1.1
>                                ?
>                                ?
>                       The world out there
>
>
> The problem is how do I get masquerading to use the 234.234.234.234
> address as if it on the outside interface rather than the 172.24.1.2
> address which is the true interface address.  Even if I re-alias the eth1
> interface as 234.234.234.234 instead, it still don't work.
>
> If I ping from the Linux box to the outside world then nothing happens
> because it tries to use the 172.24.1.2 address as the source address and
> that doesn't work with the ADSL service provider, but if I force the ping
> to use the 234.234.234.234 address as its interface address (with the -I
> option) then success.  I guess the 172.24.x.y address are only there just
> so that the modem and the DSLAM have an address each.
>
> Basically I need the 172.24.1.1 address to be the default gateway, but I
> always want the Linux Box to say that its interface address to that
> default gateway is 234.234.234.234 for the purposes of pinging and
> masquerading.
>
> Any ideas?
>
> --
> Howard.
> LANNet Computing Associates - Your Linux people
> Contact detail at http://www.lannetlinux.com
>
>
>
> --
> SLUG - Sydney Linux User Group Mailing List - http://slug.org.au/
> More Info: http://lists.slug.org.au/listinfo/slug
>