The Firewall Screen - ZyXEL Communications ZyWall USG 50-H Series User Manual

Chapter 18 Firewall
Figure 228 Firewall Example: Edit a Firewall Rule
8 The firewall rule appears in the firewall rule summary.
Figure 229 Firewall Example: MyService Example Rule in Summary

18.2 The Firewall Screen

Asymmetrical Routes
If an alternate gateway on LAN1 has an IP address in the same subnet as the ZyWALL's
LAN1 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 50-H User's Guide