topic Re: DNS in Operating System - Linux

DNS

steven Burgess_2 — Wed, 08 Jun 2005 06:37:35 GMT

Hi Everyone

Quick question,

Can anyone tell me how many DNS server RHES 3 update 4 supports ?

Ta

Steve

Re: DNS

Stuart Browne — Wed, 08 Jun 2005 06:47:10 GMT

Do you by chance mean "how many zones can BIND 9 under RHES 3u4 support?" ?

Usually a server will run a single DNS server with multiple zones being either primaried or secondaried.

That being said, a PIII or P4 single processor server running RHES3 and BIND 9 can support many hundreds domains without breaking a sweat.

I personally manage one running about 400 domains without issue.

Re: DNS

steven Burgess_2 — Thu, 09 Jun 2005 05:48:21 GMT

Hi Stuart

Sorry, should have been more specific, the question was simpler than that

How many DNS servers can I have in /etc/resolv.conf

Other sources suggest 3

Steve

Re: DNS

Alexander Chuzhoy — Thu, 09 Jun 2005 06:17:23 GMT

as you can see in the attached link 3 entries supported:

http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/files/aixfiles/resolv.conf.htm

Re: DNS

steven Burgess_2 — Thu, 09 Jun 2005 06:46:15 GMT

Re: DNS

Huc_1 — Thu, 09 Jun 2005 06:53:07 GMT

Well the man page say's look in resolv.h

grep MAXNS /usr/include/resolv.h

MAXNS should reveal this value

This is 3 this here fedora core 3

Hopr yhis is what you needed ?

Jean-Pierre Huc

Re: DNS

Steven E. Protter — Thu, 09 Jun 2005 07:17:59 GMT

Three is the max.

I believe that's a Unix standard that Linux chose not to expand.

SEP

Re: DNS

Bejoy C Alias — Thu, 09 Jun 2005 07:20:28 GMT

U can have a minimum of 1 and a maximum of 3 dns servers in ur resolv.conf file.
If u r registering a public domain it is suggested that You must have at least 2 nameservers (RFC2182 section 5 recommends at least 3 nameservers), and preferably no more than 7.