Article ID: 167271
Article Last Modified on 11/1/2006
When a Type 20 broadcast packet is received by a router (this is
indicated by a Packet Type of 14h in the IPX header,) the following
sequence of events should occur:
* The Transport Control Field of the IPX header is examined; this value
indicates the number of routers traversed by the packet so far. This
field also indicates how many Network Number fields in the packet
have been filled in. If this value is 8 or greater the packet is
discarded, otherwise proceed to the next step.
* The router compares each Network Number entry in the packet to the
Network Number of the segment on which the router received the
packet. If a match is found, the packet is discarded to prevent
multiple traversals of the same network segment; if no match is
found, proceed to the next step.
* The router places the address of the network segment on which the
packet arrived into the next available Network Number field. The
offset of this field is easily calculated as 4 * n bytes past the end
of the IPX header, where n is the value of the Transport Control
Field.
* The router increments the Transport Control Field of the IPX header
and broadcasts the packet to all directly connected network segments
that are NOT included in the Network Number fields.
Additional query words: Winnt 3Com LANplex NwLnk
Keywords: kb3rdparty kbhardware kbnetwork KB167271