On Tue, Apr 24, 2007 at 12:20:12PM +0100, David Lee wrote: > On Tue, 24 Apr 2007, Dejan Muhamedagic wrote: > > > On Mon, Apr 23, 2007 at 06:56:55PM +0100, Faisal Shaikh wrote: > > > Both cards on each machine(Sun Netras) have the same MAC addresses. Can > > > this be a cause of the problem? > > > > > > fw1 ha.d # lspci | grep Ethernet > > > 01:01.1 Ethernet controller: Sun Microsystems Computer Corp. Happy Meal > > > (rev 01) > > > 01:03.1 Ethernet controller: Sun Microsystems Computer Corp. Happy Meal > > > (rev 01) > > > > > > fw1 ha.d # dmesg | grep Ethernet > > > Ethernet address: 08:00:20:c2:d5:3e > > > eth0: HAPPY MEAL (PCI/CheerIO) 10/100BaseT Ethernet 08:00:20:c2:d5:3e > > > eth1: HAPPY MEAL (PCI/CheerIO) 10/100BaseT Ethernet 08:00:20:c2:d5:3e > > > > what!? shouldn't each device have a unique mac address? never seen > > anything like this. perhaps you should ask your hw vendor about > > this. > > (I'm a little rusty on this, but I hope what follows is broadly correct.) > > Sun hardware traditionally does do this. The location of the MAC address > is primarily in the boot prom of the machine, rather than in the ethernet > device itself, and that prom-based MAC address is then applied to all the > ethernet interfaces. Thus the observed: > eth0: ... 08:00:20:c2:d5:3e > eth1: ... 08:00:20:c2:d5:3e > > of the same MAC on multiple interfaces is normal, and expected, for Sun > hardware.
Interesting practice. Thanks for the info. > (Drifting off topic....) > > Historically, the multiple interfaces tend to be on separate subnets (as > in simple routing) where using the same MAC isn't a problem. (Concepts of > "ethernet bonding", "link aggregation" (etc.) of multiple interfaces are > relatively new and would require a little extra configuration to achieve > on default Sun hardware.) Right, that's not a problem for the wire protocols since things are done on a per interface/network basis. However, sometimes, it's convenient to use the MAC as a unique software. I think I did that myself too. > > Hope that helps. > > > -- > > : David Lee I.T. Service : > : Senior Systems Programmer Computer Centre : > : UNIX Team Leader Durham University : > : South Road : > : http://www.dur.ac.uk/t.d.lee/ Durham DH1 3LE : > : Phone: +44 191 334 2752 U.K. : > _______________________________________________ > Linux-HA mailing list > [email protected] > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems -- Dejan _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
