Re: IP connectivity with dual links (analog modem + adsl)
From: David (davidwnh@adelphia.net)Date: 10/23/02
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From: "David" <davidwnh@adelphia.net> Date: Wed, 23 Oct 2002 21:07:26 GMT
Put your ADSL connection on a gateway with a proxy. How you do it depends on
how much you want to spend and how secure you want to keep your internal
network from the outside world. A good proxy server will allow for a backup
route to a modem or RAS server if your ADSL connection goes down. Some have
included firewall protection. You can proxy public or private ip addresses.
You can filter who can get into your network from the internet and which
services you allow them. You can also filter where your internal users are
allowed to go on internet.
You can subscribe to a dynamic DNS service to take care of the non static IP
if you want to allow incoming traffic from the internet.
ISA server is a good all-in -one solution for the windows platform but
can run a bit pricey.
I don't know what is available for Linux if you want/need to go that route,
but I suspect that a good search with your browser will point you to
several viable proxy solutions. There may be a good all-in-one solution for
Linux or you may have to piecemeal together different software.
"Stuart Summerville" <stus@deimus.com.au> wrote in message
news:3db680dd$1@duster.adelaide.on.net...
> Hi all,
>
> I have a seemingly unusual network topology need that I'd like some help
> with....
>
> Current topology:
> =================
>
> Net1:
> - Linux gateway providing regular (external) net services (http, smtp..)
> via analog modem, and inet access to internal clients.
> - static IPs on class C subnet.
> - permanent/reliable connection.
> - firewall for the clients.
>
> Net2:
> - ADSL connection via one of the internal clients. Not shared to any
> other machines.
> - PC <-> ADSL modem/router is direct-connect via separate ethernet
> port: no hub/switch so only one machine has access.
> - dynamic IP addy.
> - service reliability is relatively low.
>
>
> What I really want:
> ===================
> - leave the dialup modem link to do regular inet services for the
> outside world (http, smtp...), and also act as backup link for when
> the adsl link is down. If the adsl link was reliable and had static
> IPs, then I would toss the modem link... but it doesn't.
> - have the adsl link provide inet access to the internal clients.
>
> AFAIK, the most common way to do this is with two gateways - the ADSL
> gateway acts as proxy (NAT, http..) for the clients, and the analog
> modem gateway providing specific services like smtp, httpd etc...
>
> From what I can see/imagine, trying to do this all from the one gateway
> machine will result in messy routing issues that most ISPs won't approve
> of. (Does any router system have service/port based routing?) Is such an
> arrangement achievable?
>
> Anyone know of anywhere such topologies might be documented, or better
> explained?
>
> sTu.
>
>
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