NAME

dnsproxy —

DNS proxy

SYNOPSIS

dnsproxy [-dhV] [-c file]

DESCRIPTION

The dnsproxy daemon waits for nameserver queries on a user specified address, dispatches these queries to authoritative and recursive nameservers and forwards the received answers back to the original client.

The options are as follows:

-c file: Read configuration from file.
-d: Detach from current terminal and run as background process.
-h: Show usage.
-V: Show version.

If a client from an internal IP address does a recursive lookup the query is forwarded to a recursive DNS server. Authoritative queries and queries coming from clients in foreign networks are forwarded to an authoritative DNS server.

CONFIGURATION FILE

At startup dnsproxy reads a configuration file specified via the -c option or at the default location of /etc/dnsproxy.conf.

The following keywords are recognized:

authoritative IP: Address of the authoritative nameserver [required].
recursive IP: Address of the recursive nameserver [required].
listen IP: Local address (defaults to 0.0.0.0).
port number: Local port number (defaults to 53).
chroot path: A path to chroot to before starting to answer queries.
user name: A user to change to before starting to answer queries.
authoritative-timeout seconds: Time in seconds when authoritative queries time out (defaults to 10).
recursive-timeout seconds: Time in seconds when recursive queries time out (defaults to 90).
authoritative-port number: Port number on authoritative nameserver (defaults to 53).
recursive-port number: Port number on recursive nameserver (defaults to 53).
statistics seconds: Period between output of statistics (defaults to 3600). Use 0 to disable output of statistics completely.
internal network: Declare networks recognized as internal and thus eligible to do recursive queries. One network in CIDR notation per keyword.

EXAMPLE

authoritative 10.1.1.1
recursive 127.0.0.1
recursive-port 10053
listen 192.168.1.1
port 53
chroot /var/empty
user nobody
internal 192.168.1.0/24
internal 127.0.0.1

STATISTICS

Every hour (by default) dnsproxy logs the collected statistics about its usage to standard error (or syslog when running detached). Statistics look like

ActiveQr AuthorQr RecursQr AllQuery Answered
0        0        0        0        0
TimeoutQ DroppedQ DroppedA LateAnsw HashColl
0        0        0        0        0

and have the following meaning:

ActiveQr: Number of currently active queries proxied to the servers.
AuthorQr: Accumulated number of authoritative queries.
RecursQr: Accumulated number of recursive queries.
AllQuery: Accumulated number of all queries ever received.
Answered: Accumulated number of answered queries.
TimeoutQ: Accumulated number of queries that did not receive an answer in time.
DroppedQ: Accumulated number of dropped queries (e.g. transmission errors).
DroppedA: Accumulated number of dropped answers.
LateAnsw: Accumulated number of answers received after the timeout period.
HashColl: Accumulated number of hash collisions in the query list.

VERSION

This manual page describes dnsproxy version 1.17.

AUTHORS

Armin Wolfermann <armin@wolfermann.org>

The dnsproxy homepage is at http://www.wolfermann.org/dnsproxy.html.