Configuring the Gateway
54
SMCD3GNV Wireless Cable Modem Gateway User Manual
Figure 27. Custom Firewall Security Settings
Table 10. Custom Security Settings
Option Description
Block http Blocks Hypertext Transfer Protocol (HTTP) downloads on ports 80 and 443.
Block ICMP Blocks Internet Control Message Protocol (ICMP) traffic at the outer perimeter of the Gateway
to protect against attacks such as cascading ping floods.
Block Multicast Blocks unsolicited multicast packets.
Block Peer-to-peer application Blocks peer-to-peer applications
Block IDENT Blocks identification (Ident) requests from Ident servers on port 113.
Note: Port 113 is associated with Ident. If a client program on a computer connected to the
Gateway contacts a remote server for services such as POP, IMAP, SMTP, or IRC, the
remote server returns a query to the “Ident” server running in many systems listening for
these queries on port 113. Essentially, the remote server is asking your system to identify
itself and you. This means that port 113 is often probed by attackers as a source of your
personal information.
Disable entire firewall Disables all of the Gateway’s firewall settings.
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