ZyXEL Communications P-324 User's Guide download pdf (Page 227)

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P-2602HWNLI User’s Guide

Chapter 14 Firewall Configuration 227

Figure 121 Firewall Example: Rules: MyService

14.9 Predefined Services

The Available Services list box in the Edit Rule screen (see Section 14.7.1 on page 219)

displays all predefined services that the ZyXEL Device already supports. Next to the name of

the service, two fields appear in brackets. The first field indicates the IP protocol type (TCP,

UDP, or ICMP). The second field indicates the IP port number that defines the service. (Note

that there may be more than one IP protocol type. For example, look at the default

configuration labeled “(DNS)”.

(UDP/TCP:53) means UDP port 53 and TCP port 53. Custom

service ports may also be configured using the Edit Customized Services function discussed

previously. See Appendix G on page 407 for a list of commonly used services and port

numbers.

14.10 Firewall Threshold

For DoS attacks, the ZyXEL Device uses thresholds to determine when to drop sessions that

do not become fully established. These thresholds apply globally to all sessions.

You can use the default threshold values, or you can change them to values more suitable to

your security requirements.

Refer to Section 14.10.3 on page 229 to configure thresholds.

14.10.1 Threshold Values

Tune these parameters when something is not working and after you have checked the firewall

counters. These default values should work fine for most small offices. Factors influencing

choices for threshold values are:

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