One comp > Two wlan networks? How?

Okay, here's the deal...
I have a wlan network at home... Access to the net (adsl) via wireless
router (which is also an adsl modem).
Here are the settings:
Router: 192.168.20.1
Comp: 192.168.20.2
Def.gateway: 192.168.20.1 - gateway to the net, of course...

I wish to buy another wlan adapter for my PC and connect to the local
wireless community.
The router IP is lets say 192.168.100.1, and my adapter would have lets
say 192.168.100.22.
There's no internet access over that network, just a bunch of pc-s from
local enthuziasts.

So the question is... is this feasible? I believe it is... but there
are things that puzzle me...

Is it possible to configure two default gateways? 192.168.100.1 for
another adapter? And how will my apps "react"? I mean, how do i
"tell" my browser, icq, mail etc. which gateway leads to the internet
(and therefore should be used automatically) and which goes to the wlan
community? How do they know?
So, how do I make this system work without any "conflicts"?

I hope i've been clear enough... Thanks for any help in advance. BTW,
is there some sort of a tutorial concerning this matter? I haven't had
much luck googling...

nino.vz wrote:
> Okay, here's the deal...
> I have a wlan network at home... Access to the net (adsl) via wireless
> router (which is also an adsl modem).
> Here are the settings:
> Router: 192.168.20.1
> Comp: 192.168.20.2
> Def.gateway: 192.168.20.1 - gateway to the net, of course...
>
> I wish to buy another wlan adapter for my PC and connect to the local
> wireless community.
> The router IP is lets say 192.168.100.1, and my adapter would have
> lets say 192.168.100.22.
> There's no internet access over that network, just a bunch of pc-s
> from local enthuziasts.
>
> So the question is... is this feasible? I believe it is... but there
> are things that puzzle me...
>
> Is it possible to configure two default gateways? 192.168.100.1 for
> another adapter? And how will my apps "react"? I mean, how do i
> "tell" my browser, icq, mail etc. which gateway leads to the internet
> (and therefore should be used automatically) and which goes to the
> wlan community? How do they know?
> So, how do I make this system work without any "conflicts"?
>
> I hope i've been clear enough... Thanks for any help in advance. BTW,
> is there some sort of a tutorial concerning this matter? I haven't had
> much luck googling...

For what it's worth, I have two wireless networks at home (one shared w 4
laptops/and 2 shared 256 GB network storage, and the other internet access).
I did the absolute one thing the instruction manual said never to do.... I
have the output of one, plugged into the wan input of a wap/router on the
other, and now everything works nice with each other...I still have two
access points, but one has everything on it, and the other has nothing
now... The WiFlyer (AP and dialup modem, also allows connection to broadband
DSL/Cable/etc)
Moral? If the instructions say don't do it, do it! Can't see why something
like that (IE effectively bridging the two networks) wouldn't work in your
situation.

(PS for those curious, the second is a WiFlyer portable AP/modem - useful
for traveling, www.wiflyer.com , allows both high speed inputs- or a default
dialup modem, and the first a Linksys wap54g)