FnH's Blog - 2008/1/9 - eth0_eth1_eth2_come_out_come_out_wherever_you_are 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scroll no-repeat bottom right}.node>.body>h1{font-size:larger;font-weight:normal;margin:20px 10px 10px 10px}.node>.body>div{margin:10px;}.node>.body img{padding:4px;margin:4px;border:1px solid #000} eth0, eth1, eth2, come out, come out, wherever you are Posted by FnH on 2008/1/9 22:55 Upgrading a headless systems is always a bit exciting. After recompiling the kernel and issuing the reboot command, there are those few scary seconds before it comes up again accepting ssh connections. It's the minute following the reboot command that will either make you really proud of yourself, or will have you scurrying under the desk for cables connecting keyboard and monitor, angrily muttering "I'm really getting too old for this ..." under your breath. In the course of the years you learn a few tricks relevant to upgrading the kernel of a headless system. First, after a few crawls under the desk just to have the latest and greatest linux kernel, you start to appreciate the saying "If it ain't broken, don't fix it". Seriously. If there is nothing to be gained, don't take the risk. Second, if you really do have to change a kernel, start by copying over your old .config. After a few struggles with cables because you forgot to compile in the file system used by your root partition (or network driver, or ...) you learn this lesson as well. Third, configure grub to use the new kernel only once before reverting to the old one, just in case something else goes wrong, like forgetting to run modules_install which might end up in critical hardware not functioning. When I wanted to upgrade the network card from a lousy 100Mb/s to a super fast 1Gb/s one, I took all these precautions, compiled in the extra network driver, swapped the network cards and rebooted the system. And waited. And waited some more. And cursed a little under my breath. Turns out that recent linux distributions figured out a way to track devices. Which is great, really, for your hot-pluggable harddisks and thumbdrives, giving them stable names which makes managing and automounting them a lot easier. Because distributions use the same logic for naming network devices - claiming that they have to do so to support faster, parallel loading device drivers - changing your network card will result in a new name for the device. In my case I ended up with a brand new eth1 and a missing eth0. Needless to say that this brand new network device wasn't configured properly and decided not to work. Anyway. Lesson learned. Next time I'll be more cautious when replacing hardware, and check /etc/udev/rules.d/70-persistent-net.rules before rebooting (or applicable equivalent, depending on the hardware being replaced.) Once properly configured though, the D-Link DGE-528T is working splendidly and making backups goes markedly faster now.