Hard disc size for installing a Linux router

[Stephen Liu <satimis_(_at_)_writeme_(_dot_)_com>]

Hi All Folks,

I just join this list

I have following questions :

1) what will be the minimum size for a hard disc to install a Linux router, 
a basic with firewall
2) what will be the minimum RAM requirement
3) I have an obsolete PC, P-90 with about 300 MB hard disc and 16 MB RAM. 
Can I use it ???
4) can I install a Linux router in a workstation for dual application, 
router and workstation

Thanks in advance.

Stephen Liu