Lucent Technologies 6000 - Manual (Page 497)

Configuring IPX Routing
Configuring IPX routing connections
MAX 6000/3000 Network Configuration Guide 12-11
broadcasts across a WAN connection, specify that the MAX only send or only receive SAP
broadcasts on that connection, or use IPX SAP filters.
Dial Query for bringing up a connection on the basis of service queries
Setting the Dial Query parameter to Yes configures the MAX to bring up a connection when it
receives a SAP query for service type 0004 (File Server) and that service type is not present in
the MAX SAP table.
If the MAX has no SAP table entry for service type 0004, it brings up
every connection that has Dial Query set. If 20 Connection profiles have Dial Query set, the
MAX brings up all 20 connections in response to the query.
Note: If the MAX unit has a static IPX route for even one remote server, it brings up that
connection instead of choosing the more costly solution of bringing up every connection that
has Dial Query set.
Netware t/o watchdog spoofing
The Netware t/o parameter defines the number of minutes the MAX enables clients to remain
logged in after losing a connection. NetWare servers send out NCP watchdog packets to
determine which logins are active, so that they can log out inactive clients. Only clients that
respond to watchdog packets remain logged in.
Watchdog packets can cause a WAN connection to stay up unnecessarily. But if the MAX
simply filtered them, the remote server would drop active as well as inactive client logins. To
prevent unwanted client logouts while enabling WAN connections to be brought down in times
of inactivity, the MAX local to IPX servers responds to NCP watchdog requests as a proxy for
clients on the other side of an IPX routing or IPX bridging connection. Responding to such
requests is commonly called watchdog spoofing.
To the server, a spoofed connection looks like a normal, active client login session, so it does
not log the client out. The timer begins counting down as soon as the link goes down. At the
end of the selected time, the MAX stops responding to watchdog packets and the server can
release the client-server connections. If the WAN session reconnects before the end of the
selected time, the MAX resets the timer.
Note: The MAX filters watchdog packets automatically on all IPX routing connections and
all IPX bridging connections that have watchdog spoofing enabled. The MAX applies a call
filter implicitly, which prevents the idle timer from resetting when the MAX sends or receives
IPX watchdog packets. You apply this filter after the standard data and call filters.
SAP HS Proxy (NetWare SAP Home Server Proxy)
By setting SAP HS Proxy parameters, you can configure the MAX to forward SAP broadcasts
to specified IPX networks, thus ensuring that remote users access the same resources as local
users.
When a NetWare client starts up, it broadcasts a SAP request for the nearest server if it is not
configured for a preferred server or if it does not get a response from the configured, preferred
server. By default, the MAX consults its own internal SAP table and responds to this request
with the SAP server entry indicating the lowest hop count. SAP HS proxy keeps the MAX
from making this response. Instead the MAX forwards the response to the specified IPX
network, and relies on a response from a router on that network.The MAX takes the first SAP
reply received to be the nearest server, and attaches your PC to that server.