Bridging interfaces and the internet
nmw at ion.le.ac.uk
Tue Nov 1 10:12:14 UTC 2005
Justin Willmert wrote:
> I just set up a desktop with two network cards and have got a bridge
> working between the two. That is not what my problem lies in though. I
> would like for the box to be able to connect to the internet also, but
> if I understand what I've set up correctly, I can't do that with my
> current setup. When I've tried to give one of the network cards an IP
> address, nothing but lo works, so I know there's something missing. I'll
> add my configuration at the bottom, but shortly, br0 is configured with
> an IP address, and eth0 and eth1 have none. Now, I know br0 is capable
> of at least a network connection because as I type this, I'm currently
> SSHed into into the box, but if I try to ping anything, all the packets
> are lost.
> OK, so here are some of my thoughts and possible hints to a solution:
> 1) My routing tables need another route, so I just figure out how to
> configure that and add a route.
> 2) br0, eth0, and eth1 are incapable of an internet connection, in
> which case I need to create a virtual interface that can connect as if
> it were a separate interface that does the internet connecting.
br0 is the network interface of the system. eth0 and eth1 are part of a bridge
and therefore completely transparent in the network.
> 3) (Very unsure, but...) use a alias interface to allow both eth0
> without an IP address to make br0 happy and give eth0:0 an IP address to
> allow me to connect to the internet.
> Thanks for any help,
> Justin Willmert
> ===================== ifcfg-br0 =====================
> ===================== ifcfg-eth0 =====================
> ===================== ifcfg-eth1 =====================
> ===================== static-routes =====================
> any: net 127.0.0.0 netmask 255.0.0.0 dev lo
> any: net default gw 192.168.2.2 dev br0
> ===================== output of `route` =====================
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use
> 192.168.2.0 * 255.255.255.0 U 0 0 0 br0
> 169.254.0.0 * 255.255.0.0 U 0 0 0 br0
> 127.0.0.0 * 255.0.0.0 U 0 0 0 lo
> ===== 10 second or so delay here =====
> default 192.168.2.2 0.0.0.0 UG 0 0 0 br0
You haven't set a netmask on the default route. It should be 255.255.255.0 to
match the network segment.
Nigel Wade, System Administrator, Space Plasma Physics Group,
University of Leicester, Leicester, LE1 7RH, UK
E-mail : nmw at ion.le.ac.uk
Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555
More information about the users