+Default: No.
+.TP
+\fBNoDNS\fR
+If enabled, ngircd will not make DNS lookups when clients connect.
+If you configure ngircd to connect to other servers, ngircd may still
+perform a DNS lookup if required.
+Default: No.
+.TP
+\fBListenIPv4\fR
+Set this to no if you do not want ngircd to accept clients using the standard internet protocol, ipv4.
+This allows use of ngircd in ipv6-only setups.
+Default: Yes.
+.TP
+\fBListenIPv6\fR
+Set this to no if you do not want ngircd to accept clients using the new internet protocol, ipv6.
+Default: Yes.
+.TP
+\fBConnectIPv4\fR
+Set this to no if you do not want ngircd to connect to other irc servers using ipv4.
+This allows use of ngircd in ipv6-only setups.
+Default: Yes.
+.TP
+\fBConnectIPv6\fR
+Set this to no if you do not want ngircd to connect to other irc servers using ipv6.
+Default: Yes.