Editing Internetwork Packet Exchange (section)

== IPX packet structure==

Each IPX packet begins with a header with the following structure:

{|class=wikitable style="text-align:left;"
|-
! Octets !! Field
|-
| 2 || Checksum (always 0xFFFF – no checksum)
|-
| 2 || Packet Length (including the IPX header)
|-
| 1 || Transport Control (hop count)
|-
| 1 || Packet Type
|-
| 12 || Destination address
|-
| 12 || Source address
|}

The Packet Type values are:

{|class=wikitable style="text-align:left;"
|-
! Value !! Meaning/Protocol
|-
| 0 || Unknown
|-
| 1 || RIP ([[Routing Information Protocol]]) (RFC 1582, RFC 2091)
|-
| 2 || Echo Packet
|-
| 3 || Error Packet
|-
| 4 || PEP ([[Packet Exchange Protocol]]), used for SAP ([[Service Advertising Protocol]])
|-
| 5 || SPX ([[Sequenced Packet Exchange]])
|-
| 17 || NCP ([[NetWare Core Protocol]])
|-
| 20 || Broadcast<ref name="RFC1132">{{cite web |url=https://datatracker.ietf.org/doc/html/rfc1132 |title=A Standard for the Transmission of 802.2 Packets over IPX Networks |publisher=IETF}}</ref>
|}