The IPX support in the Linux kernel has two modes of operation:
With and without the full internal IPX network. For all normal
operations, you do not need the full internal IPX network.

The full internal IPX network enables you to allocate sockets on
different virtual nodes of the internal network. This is done by
evaluating the field sipx_node of the socket address given to the bind
call. So applications should always initialize the node field to 0
when binding a socket on the primary network. In this case the socket
is assigned the default node that has been given to the kernel when
the internal network was created.
By enabling the full internal IPX network the cross-forwarding of
packets targeted at 'special' sockets to sockets listening on the
primary network is disabled. This might break existing applications,
especially RIP/SAP daemons. A RIP/SAP daemon that works well with
the full internal net can be found on ftp.gwdg.de:/pub/linux/misc/ncpfs.

If you want the full internal network, please uncomment the correspondig
#define in line 19 of include/net/ipx.h