On Fri, Jan 07, 2005 at 08:42:30PM +0530, Adil Mujeeb, Noida wrote:
> >If you do not add the host interface to the bridge, then guests
> >connected to the bridge will not have access to the external network.
> >In order for the bridge to pass packets to particular networks (e.g. the
> >ethernet network connected to eth0) the interface connected to that
> >network must be part of the bridge.
>
> I have not added the guest interface & add a new ip to bridge and update the
> routing tables and iam able to outside thru guest. Also if i attach the host
> interface & assign the ip of host interface, still i need to update the
> routing table. So whats the difference???
There is a fundamental difference between routing and bridging. Routing
inspects IP headers and routes based on that. Bridging works at the
ethernet level.
If you add all the interfaces to a bridge, there is no need to make
changes to the routing table. In fact, if your host doesn't need to be
on the network itself, there's no need to assign an IP address to the
bridge, and no need to even have a routing table.
If you taking the routing approach, you have to tell your upstream
router that your host is the gateway for all your guests. I think
proxy-arp is the solution to this, but I don't have a great deal of
experience here.
We've used bridging, and our config looks something like this:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
212.69.37.0 0.0.0.0 255.255.255.192 U 0 0 0 br0
0.0.0.0 212.69.37.1 0.0.0.0 UG 0 0 0 br0
br0 Link encap:Ethernet HWaddr 00:E0:81:2B:56:36
inet addr:212.69.37.27 Bcast:212.69.37.63 Mask:255.255.255.192
eth0 Link encap:Ethernet HWaddr 00:E0:81:2B:56:36
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
tap0 Link encap:Ethernet HWaddr 00:FF:FC:DF:2D:EB
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.00e0812b5636 no eth0
tap0
tap1
tap2
tap3
tap4
tap5
tap6
tap7
tap9
tap10
tap11
tap12
tap13
tap14
Paul
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