Tony Finch wrote: > > We use round robin DNS and it works fine, so long as nothing breaks :-) > Most MUAs will not try more than one IP address, so if the IP address they > have fixed on stops working they will break too. The way we deal with this > is to just shift the IP addresses of the broken machine onto a hot spare. > (We haven't automated it because our machines are too reliable to make it > worth adding complexity.) The other problem is that client computers often > don't respect the TTL on DNS records, so they may not respect changes > promptly. (This seems to be less of a problem now than a few years ago.) > The upshot is that you need to change the DNS several days before taking a > machine out of service.
Round-robin DNS isn't quite as reliable today as it used to be, thanks to RFC 3484. Take a look at the last couple months of the Debian tech committee archives for the gory details. - Marc -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
