Or [better still]
<Internet>---<router>--<firewall-1>-----<HUB>--<internal network>
| (192.168.1.x)
<firewall-2>
|
<HUB>
|
<guest network>
(192.168.2.x)
firewall-1&2 = IpCop Linux Firewall
See: http://www.ipcop.org/cgi-bin/twiki/view/IPCop/WebHome
--
but test everything; hold fast what is good,
1 Thessalonians 5:21