This has to be a sign that I'm getting old.
Today I upgraded Quagga on all of my Linux/Unix network servers to version 0.98.2. Looked like all was well, until I realized that all of my IPv6 tunnels to starfire (FreeBSD) were stuck in a ExStart/PointToPoint state. In OSPF, this means that the OSPF protocol has started talking, but has stopped due to some problem with the link or configuration. I restart the daemons repeatedly, since older versions of Quagga/Zebra reacted to this. No dice. I turn up some OSPFv3 debugging, and see "2005/02/27 13:04:42 OSPF6: I/F MTU mismatch." I check out the MTU settings, and find out that for the last two years, I've had the MTU on starfire set at 1280 and the MTU on the other peers set to 1480. Lovely! At least I fixed a problem that's been around for ... awhile.
On a side node, you may have noticed that I referred to these boxes as "network servers." I figured this was appropriate, since they do almost everything under the sun: routing, firewalling, vpn, dhcp, mail, dns, etc. Whatever, you get the picture.
