ZyXEL Communications XGS4600 Series - What Could Go Wrong

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3.3.4 What Could Go Wrong?
1 If the hosts are not be able to access the Internet when
Gateway-A has been disconnected from the network, the
following problems may have occurred:
a. Verify that the hosts and Gateway-B IP interface are in the
same subnet and VLAN.
b. Check for link failures on port 23 or port 24 of Gateway-B.
c. Check whether Gateway-B has a default route to USG-B.