[Sorry, the previous one is screwed up.] Hi all, My home LAN is something like this: /////////////////////////////////////////// ///////////// host1 /////////////////////// ///////////// 192.168.0.1 ///////////////// ///////////// +------+ //////////////////// ///////////// | PC-A | //////////////////// ///////////// | win2k| //////////////////// ///////////// +------+ //////////////////// //////////////// | //////////////////////// //////////////// | //////////////////////// / +------+ /// +-----+ ////// +------+ //// / | PC-B |-----| hub |--------| PC-C | //// / | win2k| /// +-----+ ////// | winNT| //// / +------+ /////// | //////// +------+ //// / host2 ////////// | //////// host3 /////// / 192.168.0.2 //// | //////// 192.168.0.3 / ////////////////// | ////////////////////// ////////////////// | ////////////////////// /////////////// +------+ ////////////////// /////////////// | PC-D | ////////////////// /////////////// | win98| ////////////////// /////////////// +------+ ////////////////// /////////////// host4 ///////////////////// /////////////// 192.168.0.4 /////////////// /////////////////////////////////////////// Everybody except PC-D can see each others and share folders or files or a printer with no problem whatsoever. But PC-D, which is actually a laptop PC, has some difficulties. While everybody else can see others either by the IP address or the host name(host1, host2...), PC-D(host4) cannot see "host2". It can ping "host1" or "host3" as well as their IP address. And it can ping 192.168.0.2, the IP address of host2. Only "host2" doesn't work. Host1 is the gateway to the outside world of this LAN and PC-D has no problem accessing outside(Internet) thru host1 as others can. PC-D, or host4, can even do the "net use" command successfully to "host1" or "host3". Howcome cannot this guy even ping "host2"? Others can ping "host4". Host4 can ping others except "host2". I'm pretty much stuck. Please help. Thanks, Dai