First 192.168.xxx.xxx addresses are private, no need to protect them.
Nasuki: your problem for speed is not that you are firewalled. Being unfirewalled helps, but you can get 100KB/s easily firewalled with the firewall to firewall transfers in LW.
So is your ISP limiting P2P traffic?
Are you connecting at your home, university or work? (the latest two often limit dl and upload speed of P2P apps)
Try Bearshare lite, if it is faster, prob is LW.
http://www.bearshare.com/lite/
Also try Ares galaxy, might not be limited by your ISP/config
http://aresgalaxy.sourceforge.net/
Ciao