On Tue, 05 Jul 2005 21:27:23 PDT, Justin Mason said: > BTW, someone (possibly Randal L. Schwartz) came up with a neat related > trick to the above -- set up an interface alias on *the same machine* as > the primary MX, list that as the last MX in the list, and (assuming that > the software side of the primary MX is reliable) you're then assured that > any SMTP traffic that arrives on that IP's port 25 is spam, since when > the primary MX's hardware goes down, this MX will, too.
That's got the same failure mode - if I take a 30-second hit and can't reach the first MX, then the link comes up before I try the last MX, I hit the "bad" one. And since the link burp is at *my* end, you don't even know about it, unless you hook it into a full BGP feed with Zebra or something and see AS1312's routes flap (and even then, it's dicy - a very short burp may not cause the routes to be withdrawn)....
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