Chapter 7: Configuring the Protocols
Perle 833IS User Guide 95
Defining the Internal WAN network as a subnet can still be useful if:
■Routers on the LAN use RIP V2. RIP V2 sends subnet information and any
routers on the LAN network using RIP2 will learn about the Internal WAN
network.
■Static routes are defined.
■The "Enable Proxy ARP" setting is used.
To set the WAN Network Address, the following fields must be defined:
IP Address
Enter the IP address that will be used by the 833IS on the Internal WAN Network for
its router port. Be careful to ensure that this address does not conflict with any dial-
in client IP addresses.
Subnet Mask
Enter the subnet mask for the internal WAN network
Enable Proxy ARP
Devices that are connected on the same IP network discover each other by sending a
message on the local network known as an ARP (Address Resolution Protocol). On
the 833IS, the Internal WAN network is usually defined as a different network from
the LAN network, and ARPs are not used. If the Internal WAN network is defined
as a subnet of the same LAN network (as described in "WAN Network Address" on
page 103z), Proxy ARPs can be enabled so that a device on the LAN can discover a
dial in client. There are some limitations associated with Proxy ARP:
■IP broadcasts will not be forwarded in this mode. Most applications will work,
but IP applications that rely on broadcasts or multicasts (such as NetBEUI over
IP) are not supported.
■There is a small performance penalty if Proxy ARPs are enabled.
Check the “Enable Proxy ARP” filed to enable Proxy ARP.