Solved

Howto clear cached MX records?

Posted on 2009-04-01
5
2,058 Views
Last Modified: 2013-12-06
Hi,
Please help me with this simple question.

Commands that DID NOT help me with this question:
/etc/rc.d/init.d/nscd restart
rndc flush
rndc reload
/etc/rc.d/init.d/named restart

After them i still get old MX records.
0
Comment
Question by:Dmitriy Ilyin
  • 2
  • 2
5 Comments
 
LVL 70

Assisted Solution

by:Chris Dent
Chris Dent earned 450 total points
ID: 24037946

Do you use Forwarders? Because if you use Forwarders in your configuration you will always get the cached response from the Forwarder.

If you run:

dig <domain> mx

It should also show you the TTL remaining which would be useful as well.

Chris
0
 
LVL 11

Assisted Solution

by:kyodai
kyodai earned 50 total points
ID: 24037948
Reflush the nscd daemon, eg. /etc/init.d/nscd restart. If you still get old DNS records you are using another DNS server (The server you issued the command at is NOT the dns server). Either also reflush the dns server your linux host is refering to or change it to another DNS.
0
 
LVL 11

Author Comment

by:Dmitriy Ilyin
ID: 24038103
It's seems to me i don't use forwarders...
Where i can check this?

0
 
LVL 70

Accepted Solution

by:
Chris Dent earned 450 total points
ID: 24038194

named.conf, Global section unless it's a conditional forward in which case it will be listed as a zone.

If it isn't using Forwarders you would have to check the answer from the servers authoritative for the domain. Perhaps the quickest way is:

dig domain.com mx +trace

Or direct a query at each name server listed in the NS record:

dig domain.com mx @ns1.domain.com
dig domain.com mx @ns2.domain.com
etc

The idea being to find the source of the response for your query.

Chris
0
 
LVL 11

Author Closing Comment

by:Dmitriy Ilyin
ID: 31597474
All my dig commands recieve data from forwarder.
Thanks for +trace tip :)
0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Squid Connection Pools 3 68
PC upgrade to Linux Mint 7 83
Child Domain and dns suffixes 9 52
Windows server:  Forwarding to 8.8.8.8 vs using root hints 2 20
This document is written for Red Hat Enterprise Linux AS release 4 and ORACLE 10g.  Earlier releases can be installed using this document as well however there are some additional steps for packages to be installed see Metalink. Disclaimer: I hav…
In my business, I use the LTS (Long Term Support) versions of Linux. My workstations do real work, and so I rarely have the patience to deal with silly problems caused by an upgraded kernel that had experimental software on it to begin with from a r…
In a recent question (https://www.experts-exchange.com/questions/28997919/Pagination-in-Adobe-Acrobat.html) here at Experts Exchange, a member asked how to add page numbers to a PDF file using Adobe Acrobat XI Pro. This short video Micro Tutorial sh…
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question