On Jul 23, Alexis Vassiliadis wrote
> Suppose I'm dual-homed, my web-server have 2 ip-addresses from 2 different
> spaces of 2 different providers.
Yes.. most of the time.
> Will it be "backup" if one of my 2 links to providers will go down?
> I.e., Does a browser poll another address from dns-reply if 1st is not
Yes and now. Usually the Browser will not try all of the A Records, but the
first one. The "first" one is different on each query, since the DNS Servers
and Resolvers do RR rolling. A user will need to 'reload' and perhaps the
browser does a new Lookup. This will most likely fail with Proxies in
between, cause Proxies do DNS Caching and negative Connection Caching on
If one ISP fails you will be still reachable, but not without troubles to
the users. (it is of course better than 1 ISP, but not as failsafe as one
(OO) -- Bernd_Eckenfels @
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