Hello,
Presently I am running CentOS release 5.5 (Final). I am looking to setup
bridging as I would like to setup some KVM virtual hosts on my system as a
test lab. I am following the the instruction at this site
> http://tldp.org/HOWTO/BRIDGE-STP-HOWTO/index.html
but I cannot figure out where I am going wrong and would be thankful if
someone could point me in the right direction.
Here is what I have done:
Check bridge information with the following:
> ~ $ modprobe -v bridge
No issues or errors
> ~ $ cat /proc/modules | grep bridge
> bidge 91889 0 - Live 0xffffffff89247000
Check to ensure forwarding is turned on:
> ~ $ cat /proc/sys/net/ipv4/ip_forward
> 1
Checked that my interface are up and running
(Was sure of this but did the check anyway):
> ~ $ ifconfig
> eth0 Link encap:Ethernet HWaddr 48:5B:39:2A:07:D5
> inet addr:192.168.1.100 Bcast:192.168.1.255 Mask:255.255.255.0
> inet6 addr: fe80::4a5b:39ff:fe2a:7d5/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:1059 errors:0 dropped:0 overruns:0 frame:0
> TX packets:1080 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:454226 (443.5 KiB) TX bytes:120584 (117.7 KiB)
> Interrupt:90 Base address:0x8400
>
> 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:92 errors:0 dropped:0 overruns:0 frame:0
> TX packets:92 errors:0 dropped:0 overruns:0 carrier:0[Thu Nov 25
So now I begin to create the bridge form CLI as I want to make sure everything
works before committing it to the config:
> brctl addbr br0
> ifconfig eth0 down
> ifconfig br0 192.168.1.100 up
> ifconfig eth0 0.0.0.0 up
> route add default gw 192.168.1.254
I check my interfaces and routing:
> ~ $ ifconfig
> br0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
> inet addr:192.168.1.100 Bcast:192.168.1.255 Mask:255.255.255.0
> inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:0 (0.0 b) TX bytes:398 (398.0 b)
>
> eth0 Link encap:Ethernet HWaddr 48:5B:39:2A:07:D5
> inet6 addr: fe80::4a5b:39ff:fe2a:7d5/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:64662 errors:0 dropped:0 overruns:0 frame:0
> TX packets:63301 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:17699194 (16.8 MiB) TX bytes:7958063 (7.5 MiB)
> Interrupt:90 Base address:0x8400
>
> 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:211 errors:0 dropped:0 overruns:0 frame:0
> TX packets:211 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:17346 (16.9 KiB) TX bytes:17346 (16.9 KiB)
> ~ $ route -n
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use
Iface
> 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 br0
> 0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0 br0
Time to test if ping works:
> ~ $ ping -c3 192.168.1.254
> PING 192.168.1.254 (192.168.1.254) 56(84) bytes of data.
> ping: sendmsg: Operation not permitted
> ping: sendmsg: Operation not permitted
> ping: sendmsg: Operation not permitted
>
> --- 192.168.1.254 ping statistics ---
> 3 packets transmitted, 0 received, 100% packet loss, time 2000ms
I know the firewall is causing this issue so I stop the firewall:
> ~ $ service iptables stop
> Flushing firewall rules: [ OK ]
> Setting chains to policy ACCEPT: nat filter [ OK ]
> Unloading iptables modules: [ OK ]
Time to try ping again:
> ~ $ ping -c3 192.168.1.254
> PING 192.168.1.254 (192.168.1.254) 56(84) bytes of data.
> From 192.168.1.100 icmp_seq=1 Destination Host Unreachable
> From 192.168.1.100 icmp_seq=2 Destination Host Unreachable
> From 192.168.1.100 icmp_seq=3 Destination Host Unreachable
>
> --- 192.168.1.254 ping statistics ---
> 3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 1999ms
To back out all I needed to do was:
> ifconfig br0 down
> brctl delbr br0
> service iptables start
> service netowrk restart
Everything is back to normal. I cannot figure out what am I missing here?
Interfaces and routing look to be setup correctly. Is there something else I
need to be looking at?
--
Regards
Robert
Linux
The adventure of a life time.
Linux User #296285
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