9 predefined services, 1 threshold values, 9 predefined services 14.10 firewall threshold – ZyXEL Communications 802.11g Wireless ADSL2+ 4-port VoIP IAD P-2602HWNLI User Manual
Page 227: Figure 121 firewall example: rules: myservice, 10 firewall threshold
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
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
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.
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: