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ASM-60 Installation and Operation Manual Appendix C IR-IP Interface Module
Quick Setup Menu C-11
LAN IP Address
Used to enter the IP address for the IP router LAN interface. This is the address to
which nodes connected to the local LAN send packets addressed to the WAN.
LAN IP Mask
Used to enter the IP subnet mask. The IP router supports a maximum of 254 hosts
on the LAN, therefore you must use Class C subnet masks. The basic subnet IP
mask for Class C addresses, which supports the maximum possible number of
hosts, 254, is 255.255.255.0. To help you understand the selection of IP subnet
masks, Figure C-7 provides a configuration example for a LAN with 6 nodes: the IP
subnet mask for a 6-node IP network is 255.255.255.248.
ASM-60 with IR-IP
.6.5.4.3192.168.1.2
LAN IP Address: 192.168.1.2
IP Address
.248.248.248.248255.255.255.248
Mask: 255.255.255.248
Mask
192.168.1.1192.168.1.1192.168.1.1192.168.1.1192.168.1.1Default Gateway
Figure C-7. Selecting the IP Subnet Mask
WAN IP Address
Used to enter the IP address for the IR-IP WAN interface, i.e., the IP address to be
used by IP hosts on the WAN to reach this IR-IP interface module.
If the WAN IP Address field remain blank, IR-IP operates in the Unnumbered
Router Mode.
WAN IP Mask
Used to enter the IP subnet mask for the WAN interface.
Default Gateway
Operation without Default Gateway
The IP interface module is intended to enable the extension of LANs through the
ASM-60 link. Therefore, its default routing operation is different from the default
routing operation of standard IP routers:
• IR-IP forwards packets with destinations not located on the local LAN through
the WAN interface
• Packets received from the WAN interface and destined to hosts located on the
local LAN are forwarded to the LAN; other packets are discarded.
The default operation is used when the Default Gateway field is blank.