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rbldns(8) System Manager's Manual rbldns(8)
NAME
rbldns - an IP-address-listing DNS server
DESCRIPTION
rbldns is an IP-address-listing DNS server. It accepts iterative DNS queries from hosts
around the Internet asking about various IP addresses. It provides responses showing
whether the addresses are on a locally configured list, such as RBL or DUL.
Configuration
Normally rbldns is set up by the rbldns-conf(8) program.
rbldns runs chrooted in the directory specified by the $ROOT environment variable, under
the uid and gid specified by the $UID and $GID environment variables.
rbldns listens for incoming UDP packets addressed to port 53 of $IP. It does not listen
for TCP queries.
rbldns handles domains of the form d.c.b.a.base where a.b.c.d is the IP address in ques‐
tion and base is given by the $BASE environment variable.
rbldns rejects inverse queries, non-Internet-class queries, truncated packets, packets
that contain anything other than a single query, query types other than A, TXT, or *, and
queries for domains outside $BASE. It looks up other queries inside data.cdb, a binary
file created by rbldns-data(8).
SEE ALSO
rbldns-conf(8), rbldns-data(8)
http://cr.yp.to/djbdns.html
rbldns(8)
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