LinuxSA Mailing list archives

  From: Richard Sharpe <sharpe@ns.aus.com>
  To  : lloy0076 , linuxsa@linuxsa.org.au
  Date: Sun, 16 Apr 2000 19:55:07 +0900

Re: BIND

At 08:28 AM 4/17/00 +0930, lloy0076 wrote:
>
>Here's an interesting question that I can't quite work out the answer
>too. I have manged to setup BIND 8.2.[a number] on my system. It works
>perfectly and finds name for me on the Internet without haivng to fall
>back on another name server (i.e. in /etc/resolv.conf, nameserver
>0.0.0.0 is sufficient).
>
>The question is the following:
>
>i have the setup of /etc/resolv.conf of
>
>nameserver 0.0.0.0
>#nameserver 203.20.69.66
>
>it works
>
>If I uncomment the hash, will my LOCAL nameserver cache a reply from
>203. 

It depends on exactly what you do. If you leave the nameserver 0.0.0.0 in
there, then it will be tried first, and will do a recursive lookup, and
will cache the answers. The second name server will not be used AFAIK.

However, if you comment out the 0.0.0.0 entry, then your nameserver will
not be used at all.

>     That is to say, obviously when I start up my PPP connection, my
>local nameserver has little to no cache (I think). Hence when I first
>start up name service is slightly but not really that noticeably slower
>until I resolve the names I usually go to. It's particularly noticeable
>when there are a lot of banner ad links because my name server has to go
>find a query for the whole lot of them/
>
>i.e. will my nameserver cache ANY valid reply OR will my nameserver only
>cache replies IT has gotten itself....

If your name server is not used for the query, it will not see the replies
... and will therefore not cache them.

If you are not up all the time, and you are visiting sites that are visited
by others, you might want to dispense with running your own name server.

>DAVID


Regards
-------
Richard Sharpe, sharpe@ns.aus.com, Master Linux Administrator :-),
Samba (Team member, www.samba.org), Ethereal (Team member, www.zing.org)
Co-author, SAMS Teach Yourself Samba in 24 Hours
Author: First Australian 5-day, intensive, hands-on Linux SysAdmin course
Author: First Australian 2-day, intensive, hands-on Samba course

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