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ZyWAN User Manual Configuring the ZyWAN

Use of Default Gateway, DHCP and DNS on ZyWAN

The ZyWAN provides two Ethernet (eth0, eth1), WiFi (wlan0), and cellular (ppp0)

interfaces. Each of these interfaces can potentially have a Default Gateway address,

DHCP, and DNS server addresses. One of these interfaces will be made the default

route to reach addresses not otherwise available on its local networks.

The Ethernet and WiFi interfaces on the ZyWAN can act as a Default Gateway, a

DHCP server, and a DNS server. The ZyWAN automatically detects the configuration

and availability of the Ethernet or WiFi networks and changes its routing and DNS

operation accordingly. This section will describe this operation in general, so the proper

configuration of the ZyWAN can be made.

Configuration Options

The Ethernet interfaces can be configured to be a DHCP client on an existing network

(the Use Dhcp? option set to Yes). The WiFi interface can be configured in similar

manner (in “managed mode”). In this case, it is likely that the ZyWAN will obtain a

Default Gateway and DNS server from the network to which it’s attached.

Static IP addresses may also be configured. This allows the Ethernet or WiFi to be

configured with a Default Gateway and two DNS Server addresses for the interface.

These items may be left blank if there is no server available, or if it doesn’t make sense

to include them in the configuration.

When configured with a static IP address, the Ethernet interface may be configured to

Run a DHCP Server. This will allow the ZyWAN to deliver an IP address to other

devices on the network. When operating in this mode, there is also an option to Pass

DNS servers to DHCP clients. The WiFi interface in “master” or “ad-hoc” modes

provides these same options to wireless clients.

Default Route

The ZyWAN will make one of its interfaces the default route based on the configuration

and the availability of each network. The order of preference for the default route is:

• Ethernet 0 (eth0)

• Ethernet 1 (eth1)

• WiFi (wlan0)

• Cellular (ppp0)

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Arcom ZyWAN Manuel d'utilisateur Page 40