connection problems

dear /tech/

I'm having a wierd problem with my network and I was hoping you could offer some suggestions.
I have three computers connected. and only one of them can connect to the internet. The other two are connecting to the network jsut fine but they are getting nothing past the router.

modem
|
router
|         |         |
comp 1   comp 2    hub
                     |
                  comp 3

comp 1 is connecting but comp 2 and three aren't.

CORRECT(AL)ED DIAGRAM FOR ILLUSTRATING WHAT THE FUCK IS GOING ON
┌───────┐ ┌────────┐ ┌───────┐   ┌─────┐  ┌───────┐ ┌──────┐
│ MODEM ├─┤ ROUTER ├─┤ COMP1 ├─┐ │ EYE ├──┤ BRAIN ├─┤ HAND │
└───┬───┘ │        │ └───────┘ │ └──┬──┘  │       │ └──────┘
    │     │        │ ┌───────┐ │    │     │       │
    =     │        ├─┤ COMP2 ├─┴────┤     │       │
    │     │        │ └───────┘      │     │       │
┌───┴───┐ │        │ ┌─────┐    ┌───┴───┐ │       │ ┌──────┐
│ 4CHAN │ │        ├─┤ HUB ├────┤ COMP3 │ │       ├─┤ COCK │
└───────┘ └────────┘ └─────┘    └───────┘ └───────┘ └──────┘