The NetWare IPX Packet Header: |
|
8 |
16 bit |
Checksum |
|
Packet Length |
|
Transport control |
Packet Type |
Destination Network (4 bytes) |
|
Destination node (6 bytes) |
|
Destination socket (2 bytes) |
|
Source network (4 bytes) |
|
Source node (6 bytes) |
|
Source socket (2 bytes) |
|
Protocol Structure - Novell IPX: Internetwork Packet Exchange Packet Header
- Checksum - when this 16-bit field is set to 1s (FFFF) it indicates that the checksum is not used.
- Packet length - specifies the length of a complete IPX datagram, in bytes. Packet fragmentation is not allowed in IPX. Packets can be of any length, up to the media maximum transmission unit (MTU) size.
- Transport control - indicates the number of routers from which the packet has passed. When the value reaches 16, assuming that a routing loop might be occurring the packet will be discarded.
- Packet type- specifies the upper-layer protocol that should receive the packet's information. It has two common values:
- 5- Specifies Sequenced Packet Exchange (SPX).
- 17- Specifies NetWare Core Protocol (NCP).
- Destination network, Destination node, and Destination socket - Specify destination information.
- Source network, Source node, and Source socket - Specify source information.
