Open Ports in BIND
Alan_Clegg at isc.org
Sun Feb 1 16:23:41 UTC 2009
> Dear Admins
> I installed Bindv9.5.1 and it works properly,,but i have some questions
> about these parameters:
> # netstat -an |grep 53 |wc
> 391 1223 20656
I think you might want to use "lsof" (or your system equivalent) to find
the open ports that are directly related to BIND.
root at yellow:~# lsof -i -n -P | grep named | grep IP
COMMAND PID USER FD TYPE DEVICE NODE NAME
named 6043 root 20u IPv6 17419 TCP *:53 (LISTEN)
named 6043 root 21u IPv4 17424 TCP 127.0.0.1:53 (LISTEN)
named 6043 root 22u IPv4 17425 TCP 127.0.0.1:953 (LISTEN)
named 6043 root 23u IPv6 17426 TCP [::1]:953 (LISTEN)
named 6043 root 24u IPv4 133746 TCP 192.168.1.125:53 (LISTEN)
named 6043 root 25u IPv4 646882 TCP 172.16.33.1:53 (LISTEN)
named 6043 root 26u IPv4 646884 TCP 192.168.136.1:53 (LISTEN)
named 6043 root 512u IPv6 17418 UDP *:53
named 6043 root 513u IPv4 17423 UDP 127.0.0.1:53
named 6043 root 514u IPv4 133745 UDP 192.168.1.125:53
named 6043 root 515u IPv4 646881 UDP 172.16.33.1:53
named 6043 root 516u IPv4 646883 UDP 192.168.136.1:53
(output slightly edited to fit 80 columns)
> is first number the total queries which asked from my server on port 53
> or number of sessions that stablished?
They are useless, as your method of collecting the information did not
actually gather anything that is provably related to BIND.
> # rndc status
> soa queries in progress: 1
> query logging is OFF
> recursive clients: 365/32668/32768
> tcp clients: 3/10000
> server is up and running
> what is the meaning of recursive clinets 365/32668?
> is 365 the number of queries which asked from my server or number of
> sessions from other clients to me?
You currently have 365 clients asking questions.
> what is the meaning of tcp clients:3?
Three clients are using TCP for some reason (zone transfer, truncation
fall-back-to-TCP, or direct TCP queries).
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