|
Well,
I've found an interesting, but not totally unexpected race condition
under DR in 2.2.x that I've managed to create when installing VIP's on a
machine in DR mode, and I figured I'd stick it on the list in case someone
else runs into it later.
Basically, the cause is this:
ifconfig dummy0 10.0.1.15
echo 1 > /proc/sys/net/ipv4/conf/dummy0/hidden
You'll notice that there's going to be a small gap between the two which
allows an ARP request to come in, and for the server to reply. And yes,
it is big enough to be bitten by -- I've been bitten twice by it so far :)
The question then is, how do I solve it?
Try changing the order to this:
echo 1 > /proc/sys/net/ipv4/conf/default/hidden
ifconfig dummy0 10.0.1.15
echo 0 > /proc/sys/net/ipv4/conf/default/hidden
That way, it defaults to being hidden when it's first created.
Another possible method would be to configure dummy0 with a bogus IP
address, then set the hidden flag, but I think I prefer the first method.
Anybody else experience this problems and have other ways to address the
problem?
Thanks,
Kyle Sparger - Senior System Administrator
ksparger@xxxxxxxxxxxxxxxxxxxx - http://www.dialtoneinternet.net
Voice - (954) 581-0097 x 122
"Forget college, I'm going pro."
|
