ZyXEL Communications ZYWALL USG 20 Manual page 731

At the time of writing, the ZyWALL does not support ingress bandwidth
management.
I uploaded a custom signature file and now all of my earlier custom signatures are
gone.
The name of the complete custom signature file on the ZyWALL is 'custom.rules'.
If you import a file named 'custom.rules', then all custom signatures on the
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'.
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.
ZyWALL USG 20/20W User's Guide
Chapter 50 Troubleshooting
731