When I try to specify bind/listen ip address via config file (/usr/local/etc/opentracker/opentracker.conf) or via command line, I always get message "V6 Tracker is V6 only!" and it doesn't start.

for example (default configuration file, without any uncommented directives) :

# egrep -cv "^#|^$" /usr/local/etc/opentracker/opentracker.conf
0

# /usr/local/bin/opentracker -i 127.0.0.1 -p 6969 -P 6969 -f /usr/local/etc/opentracker/opentracker.conf
V6 Tracker is V6 only!

# /usr/local/bin/opentracker -i 127.0.0.1 -f /usr/local/etc/opentracker/opentracker.conf                
V6 Tracker is V6 only!


but it does allow to change ports:

# /usr/local/bin/opentracker -p 6969 -P 80 -f ../opentracker/opentracker.conf
(runs in foreground)

But configuration file does not allow to specify port values without IP address, and it returns error on a try, for example:

# echo listen.tcp_udp 127.0.0.1:6969 > /usr/local/etc/opentracker/opentracker.conf

# /usr/local/bin/opentracker  -f /usr/local/etc/opentracker/opentracker.conf
V6 Tracker is V6 only!


Currently, I have to change start script /usr/local/etc/rc.d/opentracker to honor command line arguments from a newly defined variable from /etc/rc.conf.