JDownloader + PTCL DSL (shiro)

Does anyone use Jdownloader for downloading related Rapidshare links as a free user? i have started using this software but when it restarts shiro modem to change IP after downloading a file ... then it doesn't accepts new IP and also shiro modem's 192.168.1.1 is also not accessible, althought nrwing and everything works fine ... any help?