[ILUG] intermittent IP failure
kae at verens.com
Tue Jun 3 21:42:44 IST 2008
recently I've had to have a few extra IPs assigned to my machine in
order to handle SSL certs.
The IPs connect okay, but then after a random amount of time, they start
As an example, I am currently trying to ping xx.xx.xx.228 and failing.
When I log into the machine through another IP and run ifconfig, I see
that it is supposedly up:
eth0:4 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:xx.xx.xx.228 Bcast:xx.xx.xx.237 Mask:255.255.255.240
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
when I run route, I see that it also looks right:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
xx.xx.xx.224 * 255.255.255.240 U 0 0 0 eth0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
default xx.xx.xx.238 0.0.0.0 UG 0 0 0 eth0
again, the symptom is that I cannot ping the .228 IP address from
outside the machine itself.
In webmin (yes, yes...), I navigate to network interfaces, open up
eth0:4 and simply click "save and apply" without changing anything, and
suddenly everything works.
This is getting annoying, as the failures appear to be random, and I
can't guarantee that an IP will be available for any particular time.
Has anyone got any idea what to look for? I currently have a three other
addresses experiencing the same problem, so will be able to perform
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