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06-26-2005 02:43 AM
06-26-2005 02:43 AM
howto check if DNS sever caches queries correctly ?
I've installed an internal DNS server BIND 9 on Debian.
under options I have forwarders of my ISP:
options {
directory "/var/cache/bind";
forwarders { 211.12.X.X; 211.12.X.X; 194.15.X.X; };
forward first;
.....................................................................................................
howto be sure, that caches all queries
and doesn't go each time to the internet to ask DNS servers of my ISP ?
kind regards
chris
Solved! Go to Solution.
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06-26-2005 10:24 AM
06-26-2005 10:24 AM
Re: howto check if DNS sever caches queries correctly ?
Quite straightforward :
* nslookup or dig
* unplug the network cable
* nslookup or dig
You may also try a "soft" method by using tcpdump or ethereal as a spy for outgoing network traffic (monitor port 53, TCP and UDP).
Good lcuk.
Kodjo
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06-26-2005 10:34 AM
06-26-2005 10:34 AM
Re: howto check if DNS sever caches queries correctly ?
I've tried and this is working,
but I cannot find any Bind cache files.
/var/cache/bind is always empty.
where is Bind putting its cache files ?
greetings
chris
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06-26-2005 11:09 AM
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06-26-2005 08:46 PM
06-26-2005 08:46 PM
Re: howto check if DNS sever caches queries correctly ?
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06-27-2005 12:51 AM
06-27-2005 12:51 AM
Re: howto check if DNS sever caches queries correctly ?
If you get weird results like that, you can flush the DNS cache using the command 'ipconfig /flushdns' (on the windows box).
anyway ;)
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06-27-2005 07:57 AM
06-27-2005 07:57 AM
Re: howto check if DNS sever caches queries correctly ?
"It's in memory"
You mean RAM Memory ?
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06-27-2005 12:05 PM
06-27-2005 12:05 PM
Re: howto check if DNS sever caches queries correctly ?
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06-27-2005 07:29 PM
06-27-2005 07:29 PM
Re: howto check if DNS sever caches queries correctly ?
The dns cache is in ur ram memory . When u restart ur dns server all the cache is lost . Bind is not storing any dns cache in files . U cant modify the amount of memory bind uses to allocate for the cache , bind allocates the memory depending on ur total memory . U can check whether the query is resolved from the cache or from the isp server by using the steps from Kodgo or u can see the query time it takes to check whether it is resolving from cache or ur isp server. Pls see the attachment and see the query time difference.
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07-03-2005 04:04 AM
07-03-2005 04:04 AM
Re: howto check if DNS sever caches queries correctly ?
in a large scale structure the dns cache helps to avoid
a lot of unnescessary querys for the same domain. but if someone moves a server from one ip to another and i have to update the cache entrys just for that specific host what would be the best method ???
remember, i dont want to loose the whole cache with a restart
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