static IP & DHCP problems on LAN
Adam Funk
a24061 at ducksburg.com
Mon Mar 11 14:26:30 UTC 2013
I had some trouble with my NAT router the other day, so I was using
the cable modem (which I normally use in "modem mode", i.e., straight
through to my own router) for a few hours. I got everything back to
normal, but on two consecutive days now, around 01:30 or so, the
machine (desktop & home "server") has gone off its static IP address
and onto a DHCP address from the router, which makes it impossible for
me to SSH into it (unless I can guess the IP address correctly).
When I sit down at it & run
sudo ifdown -a
sudo ifup -a
it comes up with the correct static address, but then something funny
happens early in the morning to turn it back to DHCP. I also tried
running the '/etc/init.d/networking restart' command today, & that
screwed up graphics & lightdm to the extent that I rebooted the
machine in desperation.
Q1. How can that init.d/networking command screw up things unrelated
to networking? I expected it to do little more than 'ifdown -a ;
ifup -a'.
Q2. What is allowing something else to override my static config in
/etc/network/interfaces in the early morning? The config file is
the same as it was before except for a commented out stanza.
Thanks,
Adam
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