Provided by: dbndns_1.05-8ubuntu1_amd64 bug


       walldns - a reverse DNS wall


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

       For  example,  walldns  provides a PTR record for showing as the name of IP address, and a matching A record  showing  as
       the IP address of


       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-, 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.