Seguro que ese modelo no lleva firewall? De la pagina de especificaciones en su ftp he visto esto:
Model Number WRK54G
Standards IEEE 802,3, IEEE 802,3u,
IEEE 802,11g, IEEE 802,11b
Channels 11 Channels (most of
Western Hemisphere)
13 Channels (most of Europe)
Ports/Buttons Internet: One 10/100 RJ-45 Port
LAN: Four 10/100 RJ-45
Switched Ports
One Power Port
One Reset Button
Cabling Type UTP CAT 5
LEDs Power, DMZ, WLAN,
Ethernet (1, 2, 3, 4), Internet
RF Power Output 16,5 dBm
UPnP able/cert able
Security Features NAT Firewall
Wireless Security Wi-Fi Protected Access (WPA),
WEP, Wireless MAC Filtering.
No se que tipo de firewall es ese, pero lo lleva.
Un saludo