North American Network Operators Group
Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: OT? /dev/null 5.1.1 email

  • From: Valdis.Kletnieks
  • Date: Wed Jul 06 01:27:13 2005 
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be withdrawn)....

Attachment: pgp00011.pgp
Description: PGP signature