I have made almost no manual configuration changes to my Ubuntu Feisty installation since I moved to it as my primary desktop OS. I have, however, installed (and frequently uninstalled) a lot of applications, libraries, and so on (using synaptic, apt, and the Ubuntu add/remove feature). Nevertheless, given my lack of linux-level tweaking, I was surprised when my sound completely disappeared from my system. This was more of a problem for me, than I would have guessed — though I don’t usually listen to music while I’m on the system, occasionally I do want to have something in the background (mid-ground?), and when I wanted that, not having audio output was a disappointment.
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OSPF determines router id in one of three ways. The following list shows the determination mechanism:
- If an ID has been specified with the router-id command, use it.
- If there is no router-id command, use the highest numbered loopback interface, regardless of the physical interface numbers.
- If there is no router-id set, and there are no loopback interfaces, use the highest numbered physical interface as the OSPF router id.
So, what happens if none of these conditions are met? (A better question might be, “Why would you run OSPF on a router with no IP addresses set on it?” I’ll work an answer to that one into my in-progress treatise, 501 Dumb Thing To Do with your Network Lab.)
No time to post, so for now, I’ll point to fantastic article on a great site that hits the target of usefulness and power-IOS-user-hackery that I aspire to reach myself. Here is Enhancing the IOS User Interface .