Hash key data
Hash key type 12 is a 5-tuple where the hash key data is the contents of these packet header fields:
- 32-bit IPv4 / 128-bit IPv6 source address
- 32-bit IPv4 / 128-bit IPv6 destination address
- 16-bit SCTP source port number
- 16-bit SCTP destination port number
- 32-bit SCTP verification tag
The hash key data is not sorted for hash key type 12. For IPv4 packets, hash key data word 0 is always the IPv4 source address, and hash key data word 4 is always the IPv4 destination address. For IPv6 packets, hash key data words 0 – 3 are always the IPv6 source address, and hash key data words 4 – 7 are always the IPv6 destination address. This means that frames sent from IP address A to IP address B will generate a hash value different from frames sent from IP address B to IP address A (if address A and B are different).
The SCTP source port number is always placed in the lower 16 bits of hash key data word 8, and the SCTP destination port number is always placed in the upper 16 bits of hash key data word 8.
Hash key data word 9 is always the SCTP verification tag.
For IPv4 packets, hash key data words 1 – 3 and 5 – 7 are all zeros for hash key type 12.
Illustration for IPv4 packets
This figure illustrates hash key type 12 for IPv4 packets.
Illustration for IPv6 packets
This figure illustrates hash key type 12 for IPv6 packets.
Hash key type 12 is valid for frames containing an IPv4 packet or an IPv6 packet with an SCTP packet as payload.