[sclug] ADSL router

[Pieter Claassen]

Hi Chris,

So far I think we are on the same page. The main thing is that you have 
to decide if you want a functional tool (little pain) just to get your 
machines on the internet or if you relly want to set up a linux box as a 
gateway (ADSL to ethernet) and have the experience of doing it all 
yourself (the tradeoff is about ?80 for a gateway vs. 2 days 
configuration pain or less if you know what you are doing). If you are 
after the second, then you have to get an ADSL PCI or USB modem and set 
the firewall, nat, dhcp, snort(?) etc. up to get things going. If 
however you are only interested in getting your 4 internal machines on 
the network, then you have one of two easy options:
1. If you have a windows machine currently connecting to the network 
with a green mantra ADSL Modem (BT Alcatel speedtouch standard issue), 
then enable connection sharing (need XP for that) or you can download a 
gateway programm such as wingate (that was  few years ago!) and it will 
run fine (this will go on 98)
2. You can buy a seperate ADSL router and just plug that into your phone 
line. BT will still think it is only one machine connecting but it will 
NAT for your internal environment. This is a low pain option.
3. Just get your ADSL modem up and running on your linux box (need some 
kernel config which might be included in the latest 2.4.20 kernel 
binary) and then see if you can configure masquerading which should not 
be too hard. You will also need the other stuff such as firewall config 
(you need to do that anyhow since masq is part of Iptables now) and a 
dhcp server. However, keep in mind that this box needs to be hardened 
because it is naked on the internet.

Cheers,
Pieter


Chirstopher West wrote:

> Ok, thanks for the spec for the router based adsl connection, there's 
> a few things that i haven't quite understood but it may be due to my 
> initial email not being clear.
> I have an adsl connection at the moment and it runs through a usb 
> modem and is designed for use with one computer (windows 98). hence it 
> has a single dynamically assigned IP address (that's what i meant when 
> i said dial-up IP). i was planning to use and old linux box as a 
> gateway and i've set it up to do masquerading [i've opted for a single 
> IP system from BT] and will serve a network of 4 private IP's 
> (192.168.*.*).
> will the router based system enable me to masqueraded as one IP so all 
> the computers can access the internet?
> tar chris
>
>
>
>
>
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