Netopia 2200 series Software User's Manual page 174

If you check the Idle Reset checkbox, a match on this rule will keep the WAN connection
alive by resetting the idle-timeout status.
The Idle Reset setting is used to determine if a packet which matches the filter will cause
an "instant-on" link to connect, if it is down; or reset its idle timer, if it is already up. For
example, if you wanted ping traffic not to keep the link up, you would create a filter which
forwards a ping, but with the Idle Reset checkbox unchecked.
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NOTE:
Default Forwarding Filter
If you create one or more filters that have a matching action of forward, then
action on a packet matching none of the filters is to block any traffic.
Therefore, if the behavior you want is to force the routing of a certain type of
packet and pass all others through the normal routing mechanism, you must
Example: You want packets with the TOS low
latency bit to go through VC 2 (via gateway
127.0.0.3 – the Netopia Gateway will use
127.0.0.x, where x is the WAN port + 1) instead
of your normal gateway.
You would set up the filter as shown here.