User's Manual

Table Of Contents

Configuring the Gateway

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.