| PsychoGTI |
07-20-2007 11:08 AM |
Network Bridge Setup Issue
Hello Everyone!
I'm running Suse 10.0, and am trying to setup a VPN and need to bridge my eth0 interface on my local LAN to a tap0 interface for the VPN. I have installed the bridge-utils package in order to do this, and am running the following script in order to setup the bridge:
Code:
# 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="192.168.1.110"
eth_netmask="255.255.255.128"
eth_broadcast="192.168.1.127"
for t in $tap; do
openvpn --mktun --dev $t
done
brctl addbr $br
brctl addif $br $eth
for t in $tap; do
brctl addif $br $t
done
for t in $tap; do
ifconfig $t 0.0.0.0 promisc up
done
ifconfig $eth 0.0.0.0 promisc up
ifconfig $br $eth_ip netmask $eth_netmask broadcast $eth_broadcast
Here's a before and after shot of my ifconfig:
Code:
Before:
eth0 Link encap:Ethernet HWaddr 00:13:D4:6C:F7:9A
inet addr:192.168.1.110 Bcast:192.168.1.127 Mask:255.255.255.128
inet6 addr: fe80::213:d4ff:fe6c:f79a/64 Scope:Link
UP BROADCAST NOTRAILERS RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:141228 errors:0 dropped:0 overruns:0 frame:0
TX packets:256980 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:15545992 (14.8 Mb) TX bytes:31405601 (29.9 Mb)
Interrupt:193
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:397614 errors:0 dropped:0 overruns:0 frame:0
TX packets:397614 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:31398802 (29.9 Mb) TX bytes:31398802 (29.9 Mb)
After:
br0 Link encap:Ethernet HWaddr 00:13:D4:6C:F7:9A
inet addr:192.168.1.110 Bcast:192.168.1.127 Mask:255.255.255.128
inet6 addr: fe80::213:d4ff:fe6c:f79a/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:224 errors:0 dropped:0 overruns:0 frame:0
TX packets:428 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:21254 (20.7 Kb) TX bytes:69896 (68.2 Kb)
eth0 Link encap:Ethernet HWaddr 00:13:D4:6C:F7:9A
inet6 addr: fe80::213:d4ff:fe6c:f79a/64 Scope:Link
UP BROADCAST NOTRAILERS RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:142462 errors:0 dropped:0 overruns:0 frame:0
TX packets:259029 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:15677159 (14.9 Mb) TX bytes:31676506 (30.2 Mb)
Interrupt:193
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:400928 errors:0 dropped:0 overruns:0 frame:0
TX packets:400928 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:31687345 (30.2 Mb) TX bytes:31687345 (30.2 Mb)
tap0 Link encap:Ethernet HWaddr 16:DE:9C:29:45:72
inet6 addr: fe80::14de:9cff:fe29:4572/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:8 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
For some reason, I can easily access other PC's on my internal 192.168.1.1 network and on the internet before the bridge, but then after I can only reach internal LAN PC's, and not resolve ANY external addresses. My new routing table looks like this:
Code:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.128 U 0 0 0 br0
192.168.1.0 * 255.255.255.128 U 0 0 0 eth0
link-local * 255.255.0.0 U 0 0 0 eth0
loopback * 255.0.0.0 U 0 0 0 lo
default 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
Or sometimes like this (seems kinda hokey):
Code:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.128 U 0 0 0 br0
loopback * 255.0.0.0 U 0 0 0 lo
Is there some known bug for this? Am I doing anything blatantly wrong and just can't see it? I think I've got the commands in the correct order, but have no idea why I see the two different route tables from time to time. I've tried disabling my firewall completely, and messing around with the router setting as well.
Any help would be greatly appreciated. Thanks! |
