Here's a sequence of events (or observations) for which I'd
love to hear an explanation, or even a plausible guess:
My firewall box was just running like it always
does. From a machine behind it, I started four or
five SSH sessions to a remote system (my employer)
and was busy using those masqueraded connections
when everything just froze. After saying many
bad words and flailing about on that internal
machine for a while, I eventually walked over to
the console of my firewall box (which is a DHCP
client of the AT&T cable modem network's DHCP
server) and said "ifconfig" and saw the following -
note how for eth0 it fails to mention any IP addr,
Bcast addr, etc...
eth0 Link encap:Ethernet HWaddr 00:60:08:42:50:73
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1480187 errors:973 dropped:0 overruns:0 frame:973
TX packets:239467 errors:0 dropped:0 overruns:0 carrier:0
collisions:2290 txqueuelen:100
RX bytes:220287284 (210.0 MiB) TX bytes:35966230 (34.3 MiB)
Interrupt:10 Base address:0x300
eth1 Link encap:Ethernet HWaddr 00:C0:DF:62:26:38
inet addr:192.168.0.1 Bcast:192.168.1.255 Mask:255.255.254.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
.
.
.
.
...at which point I said "WTF?!?!' and issued the following commands:
ifdown -a
ifup -a
...which had the desirable but mystifying effect of (apparently)
fixing everything; ifconfig subsequently reported:
eth0 Link encap:Ethernet HWaddr 00:60:08:42:50:73
inet addr:24.128.xxx.yyy Bcast:255.255.255.255 Mask:255.255.252.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1480410 errors:973 dropped:0 overruns:0 frame:973
TX packets:239476 errors:0 dropped:0 overruns:0 carrier:0
collisions:2290 txqueuelen:100
RX bytes:220307258 (210.1 MiB) TX bytes:35968421 (34.3 MiB)
Interrupt:10 Base address:0x300
eth1 Link encap:Ethernet HWaddr 00:C0:DF:62:26:38
inet addr:192.168.0.1 Bcast:192.168.1.255 Mask:255.255.254.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
.
.
.
.
I figured that maybe I just lost my DHCP lease or
something, but the outage lasted almost 15 minutes before
I (apparently) "fixed" it by issuing those ifdown/ifup
commands, so I wonder about the DHCP theory...
--M
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