I'm downloading a smaller file this time, 1.87 GB, and it has run overnight okay with no interrupts to download due to loss of internet line. I noticed I'd forgotten to run Lighthouse scripts to keep the port open so I started it up this morning with Transmission still running. Within two minutes I'd lost internet connection. It may just be coincident, but it seems unlikely. I paused, verified local data, and turned lighthouse off again. I had a quick look to see what I could find in the logs around this time-stamp:
Console>All Messages
12/09/2009 08:08:26 hdiejectd[809] running
12/09/2009 08:08:26 KernelEventAgent[26] tid 00000000 received VQ_LOWDISK event (4)
12/09/2009 08:08:37 Lighthouse[819] NSScanner: nil string argument
12/09/2009 08:08:37 Lighthouse[819] NSScanner: nil string argument
12/09/2009 08:08:37 Lighthouse[819] NSScanner: nil string argument
12/09/2009 08:08:37 Lighthouse[819] NSScanner: nil string argument
12/09/2009 08:08:37 Lighthouse[819] NSScanner: nil string argument
12/09/2009 08:08:37 Lighthouse[819] NSScanner: nil string argument
12/09/2009 08:08:37 Lighthouse[819] NSScanner: nil string argument
12/09/2009 08:08:37 Lighthouse[819] NSScanner: nil string argument
12/09/2009 08:08:37 Lighthouse[819] NSScanner: nil string argument
12/09/2009 08:08:37 Lighthouse[819] NSScanner: nil string argument
12/09/2009 08:12:27 kernel AppleYukon2 - en0 link down
12/09/2009 08:12:33 ntpd[14] sendto(17.151.16.21) (fd=25): Can't assign requested address
12/09/2009 08:12:35 kernel AppleYukon2: 00000000,00000000 sk98osx_dnet - recovering from missed interrupt
12/09/2009 08:13:36 ntpd[14] sendto(17.151.16.21) (fd=23): No route to host
12/09/2009 08:13:36 ntpd[14] sendto(17.151.16.21) (fd=23): No route to host
12/09/2009 08:16:14 [0x0-0x49049].org.m0k.transmission[350] connect: No route to host
12/09/2009 08:16:14 [0x0-0x49049].org.m0k.transmission[350] connect: No route to host
apache2>appplefirewall.log
Sep 12 08:16:04 Macintosh-2 Firewall[41]: cupsd is listening from fe80::1:631 uid = 0 proto=6
Don't know if any of that is useful, but you can see Lighthouse produces a series of nil string arguments, and then en0 link down, so I'd guess the two things are related. Anyway, I've turned lighthouse off again and checked port is still open, and signed back on to continue download okay. I'll see if anything else pops up, but I'm quite pleased to have managed an overnight run without losing internet connection - I've not managed that before.
Cheers