Reverse Lookup

[peeyush]

Hello Everybody

I have installed a Win2k Advanced server in my network and have configured DNS server on it. I have configured one zone in Forward Lookup Zone, which quite understandable. But what is Reverse Lookup Zone? why one should need to configure it in a network? what are the benefits of using Reverse Lookup zone?



Regards
Peeyush

[vass0922]

do a ping -a on an IP
If you don't have reverse lookup, it won't resolve

syntax
ping -a 192.168.1.105

sometimes you don't want it to resolve, so you leave that blank

Welcome to TechIMO

[Siliconjunkie]

IIRC not having reverse will break certain things in AD, at the minimum you should have an entry for your DNS server.

[Mntsnow]

Also if you plan on running a mail server many admins will reject mail from servers that do not have a reverse lookup!

[embj]

How exactly are you supposed to setup a reverse DNS? As you know mntsnow...I'm running 2k3 Server and Exchange 2k3. I think that is why RR doesn't allow me to send messages to any of the users.

[Siliconjunkie]

No, RR has any dynamic IPs (say that home users) blacklisted. You need to use a SMTP smart host.

You should get a bounce message with the info.

http://security.rr.com/spam.htm

[embj]

I've seen the smart host in the options before but, are you saying that I have to type in my ISP's smtp server so that it routes things through that or what?

[DVNT1]

Originally posted by Siliconjunkie
No, RR has any dynamic IPs (say that home users) blacklisted. You need to use a SMTP smart host.

You should get a bounce message with the info.

http://security.rr.com/spam.htm

I don't think this is entirely true (all dynamic IPs blacklisted) because I am on RR and have had my own email server for a long time without any problems with email going in or out. I do understand AOL has blacklisted email servers in certain IP ranges on RR's networks though.

[Siliconjunkie]

It may depend on what RR network you are on. I have seen it both ways as well.

And, you can try your ISPs SMTP server as a smart host. Can't hurt.

[embj]

Well, my server is on the RR network. It's not that they block all outgoing mail...it's just that they block all outgoing mail to users on the rr network. I think AOL blocks my mail, too.

When I try to send mail to users of AOL I get this message:

Your message

To: XXXXX@aol.com
Subject: XXXXXXXXX
Sent: Sat, 20 Sep 2003 01:28:00 -0400

did not reach the following recipient(s):

XXXXX@aol.com on Sun, 21 Sep 2003 18:27:51 -0400
A configuration error in the e-mail system caused the message to bounce between two servers or to be forwarded between two recipients.
Contact your administrator.
<XXXXXXXXX.com #5.3.5>

Then when I try to send a message to somebody on the rr network I get a message back saying this:

Your message

To: XXXXX@nc.rr.com
Subject:
Sent: Sun, 21 Sep 2003 18:24:17 -0400

did not reach the following recipient(s):

XXXXX@nc.rr.com on Sun, 21 Sep 2003 18:24:26 -0400
The message cannot be delivered due to a configuration error on the server. Please contact your Administrator.
<mydomain.com #5.3.0 smtp;553 5.3.0 Mail from
66.57.XXX.XX rejected, see http://www.mail-abuse.org/dul>

And for the smart host what would you primarily put in? Like my stmp server primarily or what? Right now I have it set so it's using my DNS which is hosted by me.