Hello,
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
> available?
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
Host-name base.
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
might guess).
Greetings
Bernd
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