[Bridge] linux bridging problem

Brodie, Laura (Mission Systems) Laura.Brodie at ngc.com
Thu Aug 21 13:39:57 PDT 2008

Help please,

My goal is to create a bridge to do traffic shaping for a subnet.
I am trying to create a bridge following the Linux Foundation sample
setup in a VMware CentOS guest OS (before the router) using the

	brctl addbr br0
 	brctl addif br0 eth0
 	brctl addif br0 eth1
	ifconfig eth0 down
	ifconfig eth1 down
 	ifconfig eth0 up
	ifconfig eth1 up
	ifconfig eth1
The problem: A flood of ARP requests from the Vyatta machine
( looking for the DNS Server ( on the upper
network shuts down the entire network.

Laura Lee

On Tue, Aug 19, 2008 at 5:32 AM, joy c <cjjoy1980 at gmail.com> wrote:
> Hi,
>   I am trying to creat a bridge with the following command:
>         brctl addbr br0
>         brctl addif br0 eth0
>         brctl addif br0 pci0
>         ifconfig eth0 up
>         ifconfig pci0 up
>         ifconfig br0 up
>         dhclient br0
> I am able to see the bridge and interfaces to the bridge using brctl
> command.. But when I run the
> dhclient br0 command, the system stops responding.  I am not able to
> anything on the termnial and the termnial does not respond...  Please
let me
> what is the problem....

Do virtual terminals still work (Alt+F2, Alt+F3, ...)?  If yes, then
you're not receiving a dhcp response and your dhclient is configured
with a long timeout.

If no, then one of your kernel modules is hanging your system.
Include the output of "uname -a" and "lsmod".

> Thanks,
> joy
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