F07. Why Zywall 1050/Zywall Usg 300 Cannot Ping The Internet Host, But Pc From Lan Side Can Browse Internet Www; F10. Why Port Trigger Does Not Work - ZyXEL Communications ZYWALL 1050 Support Notes

When routing, ZyWALL 1050/ZyWALL USG 300 will search with the following order:
1. Local and direct connect subnet table.
2. Policy route rule.
3. Main table, which includes routes learned from RIP/OSPF, static routes and default
routes.
F07. Why ZyWALL 1050/ZyWALL USG 300 cannot ping the Internet host, but PC
from LAN side can browse internet WWW?
This is mainly caused by your interface configuration. If you setup two WAN interfaces,
which have gateway IP address configured, the default route will have two entries added in
ZyWALL 1050/ZyWALL USG 300. If one of the WAN interfaces can't connect to the internet
(for example, ppp interface don't dialup successfully), and this interface has smaller metric
than the other WAN interface, ZyWALL 1050/ZyWALL USG 300 will select this as default
route and traffic can't go out from the ZyWALL 1050/ZyWALL USG 300.
F08. Why can't I ping to the, Internet, after I shutdown the primary WAN
interface?
ZyWALL 1050/ZyWALL USG 300 routes packets by checking session information first. Once
packet matched a session that is already created, it would not lookup the routing table. So the
interface status change doesn't affect the routing result until a new session is created. If you
continually ping internet host and shutdown the ZyWALL 1050/ZyWALL USG 300 primary
WAN interface, the ping packet still matches the original session, which is bound to primary
WAN interface already. The session timeout for ICMP is 15 second.
F09. Why the virtual server or port trigger does not work?
If virtual server or port trigger (or any traffic from WAN zone to LAN zone) doesn't work,
check whether the firewall rule from WAN to LAN is disabled.

F10. Why port trigger does not work?

The port trigger will work only when there is a connection matching that policy route rule.
All contents copyright (c) 2007 ZyXEL Communications Corporation.
ZyWALL 1050/ZyWALL USG 300 Support Notes
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