On Sun, 30 Nov 2003 00:24:48 +0000, Gazza <gazza@192.168.1.1> wrote:
> Hi,
>
> I have a 3-PC 10/100 Mb/s Ethernet home network, with all machines runing
> Mandrake Linux 9.1. I have two NIC's in my main computer, PC 1. One is
> installed in PCI slot 2, the other is in PCI slot 4. In linuxconf, I set
> up their IP addresses and FQDN's (respectively) as:
>
> 192.168.1.1, bedroom.masterton.net (alias 'bedroom') and
> 192.168.2.1, bedroom.masterton2.net (alias 'bedroom2').
>
> PC's 2 and 3 were set up with IP addresses and FQDN's (respectively) of:
>
> 192.168.1.2, lounge.masterton.net (alias 'lounge') and
> 192.168.2.2, kitchen.masterton2.net (alias 'kitchen2').
>
> Because PC's 2 and 3 were on different sub-nets, it was difficult to access
> one from the other (and vice versa).
Should not have been a problem if you had proper routing. Since you were
planning on setting up an internet connection, all you would have needed
was a default route on lounge using gw 192.168.1.1, and default route on
kitchen2 using gw 192.168.2.1. Of course you need ip_forward enabled on
PC 1.
> So, I set up bridging on PC 1 by issuing the following commands:
>
> brctl addbr br0
> brctl addif br0 eth0
> brctl addif br0 eth1
> ifconfig eth0 0.0.0.0
> ifconfig eth1 0.0.0.0
> ifconfig br0 192.168.1.1
>
> and changed PC 3 to 192.168.1.4/kitchen.masterton.net/kitchen. Everything
> worked beautifully, so, I added the above brctl lines to the bottom of my
> /etc/rc.d/rc.local file so that the bridge comes into play at the end of OS
> loading. Works fine.
>
> The problem started when I installed a third NIC in PC 1, in PCI slot 3.
> This Ethernet card is connected to a cable modem and, in linuxconf, I set
> it (eth2) to get it's IP address by selecting 'DHCP'. I re-booted and did
> an ifconfig. It showed everyting as expected, except that eth2 did not
> show an IP address, but, underneath, there was something referred to as
> 'eth2:9', which had an IP address I recognised as belonging to a pool of
> IP's that my ISP uses. I could ping this dynamic address. So, everyting
> was okay. However, I could no longer ping PC 3 (192.168.1.4). 192.168.1.1
> was pingable and so was PC 2 (192.168.1.2). What's up?
What did your routing look like? It may also depend upon how you
configure iptables. For communication between eth0 and eth1 networks, you
would need to insert a forward rule before any masq rules to allow your
local networks to communicate with each other. But I am not sure how all
that works with bridging (I have done proxy_arp, but not bridging).
--
David Efflandt - All spam ignored
http://www.de-srv.com/
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