You can use the Service access control options to allow and restrict specific functions of your gateway. After you have selected or deselected your options, click Apply.
FTP : Allow LAN or WAN side access for FTP.
HTTP: Allow remote access to the gateway from the LAN or WAN.
ICMP: Select to enable ICMP for the gateway's LAN or WAN.
SSH: Allow secure remote login to the gateway from the LAN or WAN. If you change the SSH status, you must restart the gateway before the changes will take effect.
TELNET: Select to allow Command Line Interface access by Telnet from the LAN or WAN.
Return to the Internet menu options.