Forward timeout

[Jonathan Petersson]

Hi, I've a question in regards of forwarding;

Example:

...
forwarders {
    123.123.123.123;
    231.231.231.231;
}
...

Lets say that 123.123.123.123 fails and the forward is redirected to 
231.231.231.231, will this happen for each user or only once? And when 
it happens how long time does it take to fail over and is this option 
editable? When 123.123.123.123 gets up again will the server fail back 
to it?

Thanks

/Jonathan