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| Chapter 12 Firewall Configuration | |
| Table 69 Predefined Services (continued) | ||
| SERVICE | DESCRIPTION |
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| SSH(TCP/UDP:22) | Secure Shell Remote Login Program. |
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| STRMWORKS(UDP:1558) | Stream Works Protocol. |
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| SYSLOG(UDP:514) | Syslog allows you to send system logs to a UNIX server. |
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| TACACS(UDP:49) | Login Host Protocol used for (Terminal Access Controller Access |
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| Control System). |
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| TELNET(TCP:23) | Telnet is the login and terminal emulation protocol common on the |
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| Internet and in UNIX environments. It operates over TCP/IP networks. |
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| Its primary function is to allow users to log into remote host systems. |
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| TFTP(UDP:69) | Trivial File Transfer Protocol is an Internet file transfer protocol similar |
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| to FTP, but uses the UDP (User Datagram Protocol) rather than TCP |
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| (Transmission Control Protocol). |
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| VDOLIVE(TCP:7000) | Another videoconferencing solution. |
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12.9
If an outside user attempts to probe an unsupported port on your ZyXEL Device, an ICMP response packet is automatically returned. This allows the outside user to know the ZyXEL Device exists. The ZyXEL Device supports
Internet Control Message Protocol (ICMP) is a message control and
Refer to Section 11.1 on page 159 for more information.
Click Security > Firewall > Anti Probing to display the screen as shown.
Figure 122 Firewall: Anti Probing
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