The "lowest valid MAC address" is assuredly not unique to the host, which I would think rather defeats the purpose of using it as an address. On Mon, Mar 8, 2010 at 3:32 PM, Chandrashekarappa <nandinic1@xxxxxxxxx> wrote: > > My setup: > I have a machine running RHEL 5.4(kernel - 2.6.18-164.el5)with two NICs.I've > created a bonded interface bond0 with the 2 NICs(eth0 and eth1),added bond0 > to the bridge br0. > > When I create the bonded interface bond0,bond0 gets the MAC address of the > first slave device(eth0 in my case) > After I create br0 and add bond0 to br0,br0 gets the MAC address of bond0. > > Issue: > -I then add a third ethernet interface eth2 to br0 > -br0 now acquires the MAC address of eth2 > -I'd like it if the MAC address of br0 *didn't change*. > > My analysis: > -A bridge acquires the lowest MAC address of all the ports connected to > it.So,I do believe the bridge acquiring a new MAC address every time an > ethernet interface is added or removed from a bridge is expected. > -I also found this patch in the 2.6.27 upstream kernel : > 92c0574f11598c8036f81e27d2e8bdd6eed7d76d > bridge: make bridge address settings sticky > > Normally, the bridge just chooses the smallest mac address as the > bridge id and mac address of bridge device. But if the administrator > has explictly set the interface address then don't change it. > > Signed-off-by: Stephen Hemminger <shemminger@xxxxxxxxxx> > Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> > > Possible workaround: > I think I should be able to work around this issue by assigning the lowest > valid MAC address to one of my ethernet interfaces before adding it to > br0.I'd like to know what is the lowest valid MAC address that can be > assigned to a NIC. > http://standards.ieee.org/regauth/groupmac/tutorial.html > > I'd appreciate any pointers. > > > _______________________________________________ > Bridge mailing list > Bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx > https://lists.linux-foundation.org/mailman/listinfo/bridge > _______________________________________________ Bridge mailing list Bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/bridge
