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Mac OS X 10.8 flush DNS cache

February 25, 2013 by Igor Drobot Leave a Comment

DNS-Cache

I came across this Apple specific DNS cache situation this morning.
I changed a DNS record for my GIT-server and was trying to access it again, the DNS was still showing the old IP-Address. After some attempts to clear Linux DNS cache with “rndc flush” I recognized that dns is was cached by my Mac.

Mac OS X keeps a local cache of successful resolved DNS queries for a time defined by the DNS server.

To clean DNS Cache in Mac OS X versions 10.7 and 10.8, run this command from your Terminal:

1
sudo killall -HUP mDNSResponder

sudo killall -HUP mDNSResponder

Filed Under: Apple, Networking Tagged With: Apple, DNS, DNS cache, MAC OS X

Unbound DNS-Server

August 9, 2011 by Igor Drobot 1 Comment

Unbound is a validating, recursive, and caching DNS server alternative to BIND(Berkeley Internet Name Daemon) its a software product from NLnet Labs, VeriSign, Nominet, and Kirei. And of course its open source under BSD license.

Unbound supports [Read more…]

Filed Under: Linux, Networking Tagged With: DNS, dns resolving, DNS Server, dnssec, resolution, Unbound

Hide BIND sever version from nmap

July 26, 2011 by Igor Drobot Leave a Comment

Security fix for the DNS infrastructure to hide the the sensible information about the version and potential security critical bugs.

[Read more…]

Filed Under: Linux Tagged With: bind, DNS, named

Postfix home server

June 16, 2011 by Igor Drobot 1 Comment

If you have a mail server at home and your Internet service provider (ISP) has no right PTR record for your assigned IP, you will get trouble the most mail servers will reject you.

Some best examples for mail rejection: gmx.de, mail.ru

This problem can be solved [Read more…]

Filed Under: Debian, Linux, Mailing, Networking Tagged With: Debian, DNS, Mail Server, Postfix, PTR

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