If I understand your problem (I don't post to the list because I'm not
sure of having understood).
IP addresses are 'linked' to each network device. So, if you have two
network devices (e.g. a modem and an ethernet card) they will have an IP
address each.
In a typical PPP configuration, if you only intend to give internet access
to the machine having the modem (well, maybe not so typical...), the IP
address of the modem is assigned by the ISP dynamically, and will last for
the time the interface (normally ppp0) is UP. As soon as the line is cut,
the interface goes DOWN, and that address is released by the ISP, who will
assign it to any subsequent caller.
For the ethernet card, you do not have to worry, as you will have a fixed
IP address assigned (by you on your machine, and by your network
administrator in the network, meaning that IP addresses should be unique
in your network).
So let's suppose you have:
ISP ---phone_line--- modem YOUR_PC ethernet ---cable--- ethernet OTH_PC
^ ^ ^ ^
1 2 3 4
You'll know of 4 IP addresses, one on each (^).
1 and 2 are ISP assigned, so no worry...
3 and 4 are locally assigned on each PC (or other computer). You have to
choose them and assign one to each ethernet card by configuring your
/etc/init.d/network to include the lines activating your ethernet:
ifconfig eth0 ${IPADDR} netmask ${NETMASK} broadcast ${BROADCAST}
and enabling routing and so on. If you read some howtos you can find the
answer.
Well, that's all, and sorry if you already knew all this, and I have not
understood your question.
Antonio
On Sun, 19 Mar 2000, Ross Boylan wrote:
> I usually dial-up to my ISP and get an assigned IP address for the session.
> I am thinking of connecting my ethernet card to a network, so I might have
> two connections at once.
>
> My understanding is that the IP address comes from the ethernet card
> (hmm... but then it couldn't be assigned in a local network, so probably
> this is wrong..). At any rate, is there a problem with the machine doing
> both networks at once?
>
> Thanks.
>
>
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