Hello,
System:
Two servers, with an ip address each, *.*.*.9 and *.*.*.57 respectively.
They also have a third ip address *.*.*.176, that's used for http
requests, and which one (and only one) of them owns at any time.
This address is set up as an alias, ie. eth0:0 on the machine currently
owning it.
This setup is the first small step in making the two servers work as a
(moderately) High Availability system, with fairly fast fallover of the
webserver service.
The problem is that if I move the .176 ip from one machine to the other,
by "downing" it on one, and "upping" it on the other, I can't get in
contact with the new machine using the .176 number from any other machine
but the two involved in the switch.
Now, my question is:
Am I right in guessing that the problem is stale arp table entries, and is
there any way to tell the rest of the net/routers that this arp entry
should be flushed?
I've cheched rfc826 and as far as I can see, the arp protocol makes
it possible if I can generate an arp request with the .176 number as
sender address, but I'm not sure if there's a nice utility for doing
just that.
Somehow I have the feeling I have about 95% of the solution, but right
now I can't get that last bit:(
--
Henrik Olsen, Dawn Solutions I/S
URL=http://www.iaeste.dk/~henrik/
Get the rest there.
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