named udp random port - not mentioned in the configuration file.
Kevin Darcy
kcd at daimlerchrysler.com
Fri Dec 10 18:21:21 UTC 2004
As per the BIND 9 ARM:
6.2.16.6. Query Address
If the server doesn't know the answer to a question, it will query other
name servers. *query-source* specifies the address and port used for
such queries. For queries sent over IPv6, there is a separate
*query-source-v6* option. If *address* is *** or is omitted, a wildcard
IP address (*INADDR_ANY*) will be used. If *port* is *** or is omitted,
a random unprivileged port will be used, *avoid-v4-udp-ports* and
*avoid-v6-udp-ports* can be used to prevent named from selecting certain
ports. The defaults are
query-source address * port *;
query-source-v6 address * port *;
*Note: *The address specified in the *query-source* option is used
for both UDP and TCP queries, but the port applies only to UDP
queries. TCP queries always use a random unprivileged port.
*Note: *See also *transfer-source* and *notify-source*.
- Kevin
Fabiano Silos Reis wrote:
>
>Hi,
>
>
>
>Do someone know for what a random udp port is used? AFAIK my named
>process is running with rndc control port (953) and 53(tcp/udp), except
>for this random port that changes each time I restart named.
>
>
>
>$ lsof -i UDP:32768
>
>COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
>
>named 402 named 24u IPv4 2814 UDP *:32768
>
>
>
>$ netstat -nl
>
>Active Internet connections (only servers)
>
>Proto Recv-Q Send-Q Local Address Foreign Address
>State
>
>tcp 0 0 127.0.0.1:53 0.0.0.0:*
>LISTEN
>
>tcp 0 0 127.0.0.1:953 0.0.0.0:*
>LISTEN
>
>udp 0 0 0.0.0.0:32768 0.0.0.0:*
>
>udp 0 0 127.0.0.1:53 0.0.0.0:*
>
>
>
>Thanks!
>
>
>
>Fabiano
>
>
>
>
>
>
>
>
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