I newly installed Slackware 10. When I try to remotely ssh my linux box, there is always "network" problem. the linux box is connect to the internet through LAN, and within the same hub, I have no problem ssh my linux box; outside of the hub, I can't ssh it.

Please help

Is the ip number on your linux box the same as the ip number on the hub?

Do ifconfig to check the ip number on the box..

the ip in the linux box is xxx.xxx.x.001, and the pc I ssh from is xxx.xxx.x.002. Is that consider the same?

outside, say yyy.yyy.y.yyy. ip can not ssh the linux box above.

You are probably behind a router. If so, you need to configure the router to forward the incoming SSH port (22) to your Linux machine.

When you say "hub' do mean the same network or do mean a physical hub. If you are using a physical hub then is will not have any affect on that segment of your network. Hubs are stupid and have no routing capablilties at all. What ip networks are you using? If let say one of your pc's is using 192.168.100.2 and another pc is using another subnet like 192.168.101.4 then you would need a route to that network thus needing a router to connect you to a different network. what does your routing table look like (/sbin/route -n)? If your routes are not correct then you can experience that problem as well. It sound to me that you are having a routing table issue and not anything physical.