On Tue, Jun 12, 2007 at 08:37:38PM +0100, Jonathan Underwood wrote: > > > Presumably switching the two interfaces on the frontend (eth0<->eth1) > > > would also solve this problem? > > If you have root privileges this seems to be a another good approach. > I don't, but will explain the issue to sysadmin. Thanks again.
I suggest to get rid of this senseless naming (eth0, eth1) and use self-explanatory names. To illustrate it, here are some lines from /etc/mactab. It's a mapping between MAC addresses and the desired names. The file can be shared between cluster nodes, in other words, just put in all your MAC addresses and copy it around: # ipc654 ethsvc 00:00:5a:9e:a8:83 ethmp 00:0e:0c:06:2f:af ethfrz 00:0e:0c:06:2c:9b # heidi ethsvc 00:11:d8:37:98:30 ethmp 00:00:5a:9a:0b:6c # inge ethsvc 00:11:d8:37:94:71 ethmp 00:00:5a:9b:36:de where "svc" means "service" and "mp" means "message passing". By this, we can say "btl_tcp_if_include=ethmp". Obviously, this would solve your problem. This /etc/mactab stuff requires the tool "nameif" (package net-tools in Debian) and needs to be called before the interfaces are pulled up. For Debian, we use: # /etc/network/interfaces -- configuration file for ifup(8), ifdown(8) auto lo iface lo inet loopback pre-up nameif -s auto ethsvc # the usual stuff For Gentoo, we have in /etc/conf.d/net: # rename interfaces according to /etc/mactab preup() { ip link set "${IFACE}" down || true nameif -s return 0 } If a system has more than one NIC, I would never let the kernel define the naming, but always use /etc/mactab instead. HTH -- Cluster and Metacomputing Working Group Friedrich-Schiller-Universität Jena, Germany private: http://adi.thur.de