I'm inspired to ask this after waking up to a dead DSL line this morning. Fortunately it revived shortly thereafter, but concerns linger as I provide mail, WWW and some other services that I REALLY want to stay up.
Suppose I have two DSL lines attached to my multi-homed server. I can think of two different ways to handle the DNS: (1) Round-robin DNS. Advertise both external IP addresses for the same domains. DNS lookups have an equal chance of returning either IP. This approach is suggested by: http://www.samag.com/documents/s=1824/sam0201h/0201h.htm. (2) Run a separate instance of BIND on each of the two interfaces, one as the primary and one as the secondary nameserver. Each instance resolves names to its own IP address. This way if the primary DSL line dies, so does its nameserver and the outside world will presumably try the secondary nameserver, which in turn will give out only the remaining IP. #1 seems like a nice solution for load balancing, but I'm not sure how well it works for failover which is my primary concern. In particular, will half of all HTTP requests fail if either line goes down? I suspect so. #2 I just made up. Comments? Any other ideas? Thanks, -- Rod _______________________________________________ vox-tech mailing list [EMAIL PROTECTED] http://lists.lugod.org/mailman/listinfo/vox-tech
