RE: [Nolug] Help please

Hi Chris.

Hope this helps.

1) For every IP address in use there should be a name (reverse lookup).
    Note: Many violate this rule. Thus you should only try to enforce it
in limited circumstances (known group of users).

2) For every name in use there should be an IP address.
    Note: This is always the case, else the name would not be usable.

3) Multiple names can point to the same IP address.

4) An IP address can only point to one name. This name should be one of
the names which points to the IP address.

Thus, when someone id's with a name and you look it up, then reverse it, you
might end up with a different name. This is OK.

John

    John Souvestre - Southern Star - (504) 888-3348 - www.sstar.com

-----Original Message-----
From: owner-nolug@joeykelly.net [mailto:owner-nolug@joeykelly.net] On Behalf
Of Chris Reames
Sent: Monday, April 05, 2004 3:17 PM
To: nolug@joeykelly.net
Subject: RE: [Nolug] Help please

Off the wall thought...
I was having similar problems with my FTP server.
My server was wanting a double reverse lookup to validate incoming
connections.
This was too long ago to remember what the resolution was, but it may
explain the connection to some sites but not others.
Hopefully this will jog somebody in the right direction.

Could this be a web server or firewall blocking rule?
Where the forward and reverse lookups don't match???

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Received on 04/05/04