Hash Key Type 16: 3-Tuple GTPv1/GTPv2

Napatech Link™ Software Features

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Intel® PAC
Napatech SmartNIC
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Feature Description

Hash key data

Hash key type 16 is a 3-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
  • 32-bit GTPv1 or GTPv2 TEID (tunnel endpoint identifier)

The hash key data is not sorted for hash key type 16. 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).

Hash key data word 8 is always the GTPv1 or GTPv2 TEID.

For IPv4 packets, hash key data words 1 – 3, 5 – 7 and 9 are all zeros for hash key type 16. For IPv6 packets, hash key data word 9 is all zeros for hash key type 16.

Illustration for IPv4 packets

This figure illustrates hash key type 16 for IPv4 packets.

3-tuple GTPv1/ GTPv2 hash key for IPv4

Illustration for IPv6 packets

This figure illustrates hash key type 16 for IPv6 packets.

3-tuple GTPv1/ GTPv2 hash key for IPv6

Validity

Hash key type 16 is valid for frames containing an IPv4 packet or an IPv6 packet with a GTPv1 or a GTPv2 packet as payload.