NAME

       walldns - a reverse DNS wall server

DESCRIPTION

       walldns is a reverse DNS wall.  It accepts iterative DNS queries for
       in-addr.arpa domains from hosts around the Internet, and supplies
       generic responses that avoid revealing local host information.

       For example, walldns provides a PTR record for 4.3.2.1.in-addr.arpa
       showing 4.3.2.1.in-addr.arpa as the name of IP address 1.2.3.4, and a
       matching A record showing 1.2.3.4 as the IP address of
       4.3.2.1.in-addr.arpa.



CONFIGURATION

       Normally walldns is set up by the walldns-conf(8) program.

       walldns runs chrooted in the directory specified by the $ROOT
       environment variable, under the uid and gid specified by the $UID and
       $GID environment variables.

       walldns listens for incoming UDP packets addressed to port 53 of $IP.
       It does not listen for TCP queries.


FURTHER DETAILS

       walldns rejects inverse queries, non-Internet-class queries, truncated
       packets, packets that contain anything other than a single question,
       queries for domains outside in-addr.arpa, and request types other than
       A, PTR, and *.

       walldns does not include NS or SOA records with its responses.

       walldns uses TTLs slightly over one week.


SEE ALSO

       walldns-conf(8)


REFERENCE

       http://cr.yp.to/djbdns.html



                                       8                djbdnscurve6:(walldns)

Man(1) output converted with man2html