ZyXEL Communications P-2612HW-F1 User Manual page 137

The following lists out the steps taken, when a computer tries to access the
Internet for the first time through the ZyXEL Device.
When a computer (which is in a different subnet) first attempts to access the
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Internet, it sends packets to its default gateway (which is not the ZyXEL Device)
by looking at the MAC address in its ARP table.
When the computer cannot locate the default gateway, an ARP request is
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broadcast on the LAN.
The ZyXEL Device receives the ARP request and replies to the computer with its
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own MAC address.
The computer updates the MAC address for the default gateway to the ARP table.
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Once the ARP table is updated, the computer is able to access the Internet
through the ZyXEL Device.
When the ZyXEL Device receives packets from the computer, it creates an entry in
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the IP routing table so it can properly forward packets intended for the computer.
After all the routing information is updated, the computer can access the ZyXEL
Device and the Internet as if it is in the same subnet as the ZyXEL Device.
P-2612HW-F1 User's Guide
Chapter 7 LAN Setup
137