D-Link Wireless ADSL2/2+ 4-port Ethernet Router DSL-2640U - Access Control-Services; Access Control-IP Address

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Access Control—Services
Services that can be enabled / disabled on the LAN / WAN are FTP, HTTP, ICMP,
SNMP, Telnet, and TFTP.
Access Control—IP Address
Web access to the router can be limited when Access Control Mode is enabled. The
IP addresses of allowed hosts can be added using Access Control IP Address. →
Add the IP address to the IP address list by clicking on the Add button, then select
“Enabled” to enable Access Control Mode.