The Firewall Screen - ZyXEL Communications ZYWALL USG 2000 Manual

Chapter 20 Firewall
Enter the name of the firewall rule.
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Make sure Dest_1 is selected for the Destination and MyService is selected as
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the Service. Enter a description and configure the rest of the screen as follows.
Click OK when you are done.
Figure 209 Firewall Example: Edit a Firewall Rule
The firewall rule appears in the firewall rule summary.
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Figure 210 Firewall Example: MyService Example Rule in Summary

20.2 The Firewall Screen

Asymmetrical Routes
If an alternate gateway on the LAN has an IP address in the same subnet as the
ZyWALL's LAN IP address, return traffic may not go through the ZyWALL. This is
called an asymmetrical or "triangle" route. This causes the ZyWALL to reset the
connection, as the connection has not been acknowledged.
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ZyWALL USG 2000 User's Guide