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ASYNC ROUTER AR-P, AR-5, AND SYNC ROUTER USER’S MANUAL
79
B.2.4 USE THE ROUTER’S PREDEFINED IPX/SPX FILTERS
Idle and unnecessary IPX and SPX packet transmission can be selectively restricted by Router’s dial
suppression feature (called RLO). RLO is essentially a predefined group of IPX and SPX filters, that
filter unnecessary calling (calling not initiated by the user).
Using NLO, you can separately enable the Router to suppress dialing due to:
• Pings from NetWare servers
• SPX idle traffic
• NetBIOS name broadcasts between servers
• Any other IPX broadcasts
RLO reduces line use due to applications like Lotus
®
Notes, Windows
®
for Workgroups, Novell
NetWare Management System, and Cheyenne
®
ArcServe.
How to enable all RLO filters
Enter the following command to start the RLO filters:
ipx optimization on enable all NLO filters
When NLO is enabled, the Router is automatically configured to minimize unnecessary dialing.
How to disable the NLO filters
Enter the following command to disable the NLO filters:
ipx optimization off disable all NLO filters
B.2.5 W
RITE YOUR OWN IP AND IPX FILTERS
To prevent certain hosts or networks from making connections with your Router, employ an IP or IPX
dial filter. Using dial filters does not restrict all hosts on your own network, as the dialup-quota method
does.
Dial filters are best used to restrict the access of specified hosts, networks and applications.
Use the -t nodial parameter of the filter command to create IP dial filters.
Use the filter, ripfilter, or sapfilter command to create IPX dial filters.
Simple IP filter example
A branch-office LAN is connected to its home office through a Router, and the home office is connected
to the Internet. To prevent hosts on the Internet from routing through your home office over the dialup
connection to your remote office, install an IP dial filter. For example, domain-name packets entering
the system with a destination port number 53 cannot be sent to the remote office on the modem0 port
when the following command is entered to the home-office Router:
filter add dnsfilter -d any 53 -t nodial -i modem0 -f outbound
filter enable
Also refer to the filter command in Section 3.6 of the Reference Manual, which begins on page 137.