DNS
 
Forums: » Register « |  User CP |  Games |  Calendar |  Members |  FAQs |  Sitemap |  Support | 
User Name:
Password:
Remember me
Go Back   Dev Shed ForumsSystem AdministrationDNS
The ASP Free website provides in-depth information on the latest developer tools available from Microsoft. Our cadre of writers, highly experienced industry experts, reveals the best ways to use established technologies as well as new and emerging technologies. Our coverage of Microsoft's development and administration technologies is among the most respected in the IT industry today.

ASP Free and Iron Speed Designer are giving away $5,500+ in FREE licenses. Iron Speed's RAD CASE toolset can save up to 80% of your coding time. One free license per week, one perpetual license per month!
Download and Activate to enter!

Intel® Graphics Performance Analyzers is a powerful tool suite for analyzing and optimizing your games, media, and graphics-intensive applications. Used by some of the best developers on the planet, Intel GPA lets you maximize your app’s performance.


Tutorials
| Forums

Download to Enter
| Contest Rules

DOWNLOAD INTEL® GPA FOR FREE

Reply
Add This Thread To:
  Del.icio.us   Digg   Google   Spurl   Blink   Furl   Simpy   Y! MyWeb 
Thread Tools Search this Thread Rate Thread Display Modes
 
Unread Dev Shed Forums Sponsor:
  #1  
Old March 20th, 2003, 09:59 AM
mszekeres mszekeres is offline
Junior Member
Dev Shed Newbie (0 - 499 posts)
 
Join Date: Mar 2003
Posts: 2 mszekeres User rank is Just a Lowly Private (1 - 20 Reputation Level) 
Time spent in forums: < 1 sec
Reputation Power: 0
DNS Reverse lookup ... for email

I am trying to active Reverse Lookup security on my email server. However when my email server makes a Reverse Lookup query to my DNS server it fails. Basically the DNS server will only successfully respond to reverse lookup queries if the entry can be resolved locally on the box. How do you configure a DNS server to resolve queries of reverse lookups that are not local to the DNS server.

Obviously, its a common configuration because many people implement reverse lookup on their email server.

Any help would be appreciated.

Thanks.

Reply With Quote
  #2  
Old March 20th, 2003, 11:22 PM
freebsd freebsd is offline
Contributing User
Dev Shed Newbie (0 - 499 posts)
 
Join Date: Jan 2001
Posts: 5 freebsd User rank is Just a Lowly Private (1 - 20 Reputation Level) 
Time spent in forums: < 1 sec
Reputation Power: 0
>> because many people implement reverse lookup on their email server

Not that many, really, perhaps just 20% of SMTP servers out there have a matching reverse DNS. Many big ISPs even have a broken reverse DNS on their MX records because most sysadmins are clueless in DNS.

>> However when my email server makes a Reverse Lookup query to my DNS server it fails

I don't quite understand you. Are you trying to say that the reverse DNS of your IP returns null?

>> I am trying to active Reverse Lookup security on my email server.

Just because your ISP assigned you a static IP doesn't mean you can be authoritative for such IP. In order to do that your ISP has do delegate the authority to you (I bet even you pay them $1000 they still won't do it because they are not allowed to).
Even you lease a class C block from your ISP there is still no guarantee that they can delegate that to you mainly because of their upstream policy.

If you really need reverse DNS for your IP go switch provider, I recommend SpeakEasy.net

Reply With Quote
  #3  
Old March 21st, 2003, 09:18 AM
mszekeres mszekeres is offline
Junior Member
Dev Shed Newbie (0 - 499 posts)
 
Join Date: Mar 2003
Posts: 2 mszekeres User rank is Just a Lowly Private (1 - 20 Reputation Level) 
Time spent in forums: < 1 sec
Reputation Power: 0
clarify

I guess I wasn't too clear in my first message.

The issue is that my DNS server does not return values for reverse lookup querries that are not local to my DNS server.

For example .. I can do a reverse lookup for my own domain and get a successfull response but if I do a reverse lookup for lets say yahoo.com is won't return the successful response. Now I can then go to some Internet DNS servers and do a reverse lookup for yahoo.com and it works.

Basically, I need to have my DNS server look elsewhere for reverse lookups if it is not local. It works for forward lookups .. what do I need to configure for it to work on reverse lookups.

Reply With Quote
  #4  
Old March 22nd, 2003, 02:49 AM
freebsd freebsd is offline
Contributing User
Dev Shed Newbie (0 - 499 posts)
 
Join Date: Jan 2001
Posts: 5 freebsd User rank is Just a Lowly Private (1 - 20 Reputation Level) 
Time spent in forums: < 1 sec
Reputation Power: 0
>> I can do a reverse lookup for my own domain and get a successfull response

How to do it exactly? Any tools? Commands or what?

>> if I do a reverse lookup for lets say yahoo.com is won't return the successful response

Show us step-by-step how to do a reverse lookup

>> I need to have my DNS server

Define DNS server.

In addition, are you connected to the Internet thru a proxy or so?
What's in your /etc/hosts and /etc/resolv.conf file.

Reply With Quote
Reply

Viewing: Dev Shed ForumsSystem AdministrationDNS > DNS Reverse lookup ... for email


Thread Tools  Search this Thread 
Search this Thread:

Advanced Search
Display Modes  Rate This Thread 
Rate This Thread:


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
View Your Warnings | New Posts | Latest News | Latest Threads | Shoutbox
Forum Jump

Forums: » Register « |  User CP |  Games |  Calendar |  Members |  FAQs |  Sitemap |  Support | 
  
 


Powered by: vBulletin Version 3.0.5
Copyright ©2000 - 2012, Jelsoft Enterprises Ltd.

© 2003-2012 by Developer Shed. All rights reserved. DS Cluster 1 - Follow our Sitemap