now my ktorrent listen port 58243 over ipv6. how i can switch it to ipv4?

You can disable it in some config file somewhere (I think). However why do you want to do this ? This is not necessary at all, linux uses a dual stack implementation which means that if you are listening on :::58243, you are also listening on the IPv4 equivalent 0.0.0.0:58243

maybe it's issue in my system. at work and at home i'm using debian squeeze/sid and ktorrent (4.0beta2) listen only ipv6 port:

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xsektorx@work-325:~$ nmap 127.0.0.1 -p 58243

Starting Nmap 5.00 ( http://nmap.org ) at 2010-05-25 15:24 MSD
Interesting ports on localhost (127.0.0.1):
PORT      STATE  SERVICE
58243/tcp closed unknown

Nmap done: 1 IP address (1 host up) scanned in 0.09 seconds

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xsektorx@work-325:~$ nmap ::1 -p 58243 -6

Starting Nmap 5.00 ( http://nmap.org ) at 2010-05-25 15:25 MSD
Interesting ports on localhost (::1):
PORT      STATE SERVICE
58243/tcp open  unknown

Nmap done: 1 IP address (1 host up) scanned in 0.09 seconds

sek.tor wrote:maybe it's issue in my system. at work and at home i'm using debian squeeze/sid and ktorrent (4.0beta2) listen only ipv6 port:

Yes, IPv4-mapped addresses are disabled on Debian squeeze/sid by default (and majority of other non-Linux OSes too)

See http://lists.debian.org/201005251113.07 ... vainius.eu , https://bugs.kde.org/show_bug.cgi?id=238688

can i fix it by recompile with bindv6only=0?

sek.tor wrote:can i fix it by recompile with bindv6only=0?

This is kernel option, so

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echo 0 > /proc/sys/net/ipv6/bindv6only

or

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sysctl net.ipv6.bindv6only=0

. But you can simply install packages mentioned in the mail. I'm Debian maintainer of the ktorrent package so those packages are as official as you can get at this point (libktorrent has been stuck in NEW queue for 2+ weeks, I can't do anything to speed things up).

thanks a lot, solved