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. (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.) 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
