slow internet connection

I have a small network. suse 6.3 works as a gateway, one windows machine have normal browsing speed(10 seg). The suse 9.0 machine takes ages (60-90seg) to show pages up. In mozilla status bar "resolving www.bla.bla.bla" remains a lot of time, but if I type in the command line "host www.bla.bla.bla" it respondes right away.