ZyXEL Communications ZyWALL USG 50 User Manual page 785

ZyWALL are overwritten with the new file. If this is not your intention, make sure
that the files you import are not named 'custom.rules'.
I cannot configure some items in IDP that I can configure in Snort.
Not all Snort functionality is supported in the ZyWALL.
The ZyWALL's performance seems slower after configuring ADP.
Depending on your network topology and traffic load, applying an anomaly profile to
each and every packet direction may affect the ZyWALL's performance.
The ZyWALL routes and applies SNAT for traffic from some interfaces but not
from others.
The ZyWALL automatically uses SNAT for traffic it routes from internal interfaces
to external interfaces. For example LAN to WAN traffic. You must manually
configure a policy route to add routing and SNAT settings for an interface with the
Interface Type set to General. You can also configure a policy route to override
the default routing and SNAT behavior for an interface with the Interface Type
set to Internal or External.
The ZyWALL is not applying a policy route's port triggering settings.
You also need to create a firewall rule to allow an incoming service.
I cannot get Dynamic DNS to work.
• You must have a public WAN IP address to use Dynamic DNS.
• Make sure you recorded your DDNS account's user name, password, and
domain name and have entered them properly in the ZyWALL.
• You may need to configure the DDNS entry's IP Address setting to Auto if the
interface has a dynamic IP address or there are one or more NAT routers
between the ZyWALL and the DDNS server.
ZyWALL USG 50 User's Guide
Chapter 52 Troubleshooting
785