[lug] DNS error. Kinda vague.

[Ian Hall-Beyer]

On Sat, 16 Sep 2000, John Starkey wrote:

> > Looks like your login process and MTA are attempting to do reverse name
> > lookups on the originating IP.

> Is there really any need for this?? Why would login need to get involved
> with sendmail??

They don't have anything to do with each other, per se, but rather,
tcpwrappers is doing a reverse lookup on the originating IP. If hosts.deny
has ALL:PARANOID in it, any IP that doesn't match forward and reverse is
denied.

Sendmail also does a similar sort of lookup and will put a warning in the
headers if the reverse dns doesn't match what the originating server
claims it is.

-Ian

--
<cosmo> wow, this is kinda nifty. the win98 protocol stack is 
like a chinese finger puzzle, twist and turn in the right places, 
and it pops right off			--Seen on EFNet IRC