Since dial-up connection (e.g. ISDN calls) charges are based on the connection time, a technique
called IP spoofing is often used to limit or prevent unnecessary connection time. This is done by (1)
allowing control packets to be sent only when the connection is already up transmitting user data, or
(2) allowing control packets to be spoofed (faked) so that they don’t add load to the WAN traffic. IP
RIP broadcasts are sent only when the connection is up.
Example:
Router> enable spoofing isdn1 iprip
Router> disable spoofing isp2 iprip
ping <ipAddr> [n_times] [n_size]
Description: See description under Diagnostics.
set ip default route <gateway-ipAddr> set ip default route <Profile Name>
Description: This command is used to set the IP default route. The default route will be used when an
IP packet’s destination IP address cannot be found in the IP routing table. If the default route is not
defined, such a packet is discarded.
Example:
Router> set ip default route 204.71.220.153
Router> set ip default route isp1
set ip lan <ip_addr> <netMask>
Description: This command assigns a “public” IP address to the LAN port of the router. As a
consequence, the LAN port maps to two IP addresses (one public and one private), and is therefore on
two networks.
Example:
Router> set ip lan 204.71.220.153 255.255.255.0
set ip private <ip_addr> <netMask>
Description: This command is used to modify the “private” IP address on the router’s LAN interface.
The IP network corresponding to the “set ip private” command becomes the private network. Private
addresses are not legal for use on the Internet and therefore, devices in this network are no longer
accessible from public devices on the Internet side. All devices within this “private” network are
represented by one single IP address: the IP address received from an Internet Service Provider at
connect time. Note that 192.168.168.230 is the default private address used for routers, and the private
network address is 192.168.168.0, and therefore all private devices (by default) should have IP
addresses within the range of 192.168.168.1 to 192.168.168.254. Private IP addresses may be any
Class A, B or C address as described in the “DHCP” section of this manual.