9 anti-probing, Figure 107 firewall: anti probing – ZyXEL Communications 802.11g HomePlug AV ADSL2+ Gateway P-660HWP-Dx User Manual
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Chapter 11 Firewall Configuration
P-660HWP-Dx User’s Guide
63
11.9 Anti-Probing
If an outside user attempts to probe an unsupported port on your P-660HWP-Dx, an ICMP
response packet is automatically returned. This allows the outside user to know the P-
660HWP-Dx exists. The P-660HWP-Dx supports anti-probing, which prevents the ICMP
response packet from being sent. This keeps outsiders from discovering your P-660HWP-Dx
when unsupported ports are probed.
Internet Control Message Protocol (ICMP) is a message control and error-reporting protocol
between a host server and a gateway to the Internet. ICMP uses Internet Protocol (IP)
datagrams, but the messages are processed by the TCP/IP software and directly apparent to the
application user.
Refer to
for more information.
Click Security > Firewall > Anti Probing to display the screen as shown.
Figure 107 Firewall: Anti Probing
SSH(TCP/UDP:22)
Secure Shell Remote Login Program.
STRMWORKS(UDP:1558)
Stream Works Protocol.
SYSLOG(UDP:514)
Syslog allows you to send system logs to a UNIX server.
TACACS(UDP:49)
Login Host Protocol used for (Terminal Access Controller Access
Control System).
TELNET(TCP:23)
Telnet is the login and terminal emulation protocol common on the
Internet and in UNIX environments. It operates over TCP/IP networks.
Its primary function is to allow users to log into remote host systems.
TFTP(UDP:69)
Trivial File Transfer Protocol is an Internet file transfer protocol similar
to FTP, but uses the UDP (User Datagram Protocol) rather than TCP
(Transmission Control Protocol).
VDOLIVE(TCP:7000)
Another videoconferencing solution.
Table 64 Predefined Services (continued)
SERVICE
DESCRIPTION