Hi,
I've followed the tutorial on bridge setup but have the problem that as soon as I run the bridge-start script on the host, I can no longer access the internet from that machine. I'm 99% sure this is a routing problem but I have no idea what the routing table is meant to look like post-bridge and can't see any examples. Can someone please tell me how it should be setup?
Host is ubuntu linux. Here is the ifconfig and route table
before the bridge is started ie when can access the internet:
eth0 Link encap:Ethernet HWaddr 08:00:27:3c:a1:c5
inet addr:10.0.2.15 Bcast:10.0.2.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe3c:a1c5/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:28 errors:0 dropped:0 overruns:0 frame:0
TX packets:46 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4005 (4.0 KB) TX bytes:6675 (6.6 KB)
lo Link encap:Local Loopback
......
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.0.2.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
0.0.0.0 10.0.2.2 0.0.0.0 UG 0 0 0 eth0
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.0.2.0 * 255.255.255.0 U 1 0 0 eth0
link-local * 255.255.0.0 U 1000 0 0 eth0
default 10.0.2.2 0.0.0.0 UG 0 0 0 eth0
Here's the top of my bridge-start (rest is default):
# Set up Ethernet bridge on Linux
# Requires: bridge-utils
#################################
# Define Bridge Interface
br="br0"
# Define list of TAP interfaces to be bridged,
# for example tap="tap0 tap1 tap2".
tap="tap0"
# Define physical ethernet interface to be bridged
# with TAP interface(s) above.
eth="eth0"
eth_ip="10.0.2.15"
eth_netmask="255.255.255.0"
eth_broadcast="10.0.2.255"
So after I start the bridge I have:
Destination Gateway Genmask Flags Metric Ref Use Iface
10.0.2.0 0.0.0.0 255.255.255.0 U 0 0 0 br0
br0 Link encap:Ethernet HWaddr 08:00:27:3c:a1:c5
inet addr:10.0.2.15 Bcast:10.0.2.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe3c:a1c5/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:704 (704.0 B) TX bytes:0 (0.0 B)
eth0 Link encap:Ethernet HWaddr 08:00:27:3c:a1:c5
inet6 addr: fe80::a00:27ff:fe3c:a1c5/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:3817 errors:0 dropped:0 overruns:0 frame:0
TX packets:3163 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3318137 (3.3 MB) TX bytes:636295 (636.2 KB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:480 (480.0 B) TX bytes:480 (480.0 B)
tap0 Link encap:Ethernet HWaddr 9e:3b:e2:d3:e3:68
UP BROADCAST PROMISC MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Thanks,
Nigel
