https://datatracker.ietf.org/doc/html/rfc6985
+-----------+---------------------+---------------------------+
| IP Length | Percentage of Total | Length(s) at Other Layers |
+-----------+---------------------+---------------------------+
| 64 | 23 | 82 |
| 128 | 67 | 146 |
| 1000 | 10 | 1018 |
+-----------+---------------------+---------------------------+
https://support-kb.spirent.com/infocenter/index?page=content&id=FAQ11671&cat=SOFTWARE_TESTCENTER&actp=LIST&showDraft=false
Example : Here are the calculations for iMix with frame sizes 64 (61%), 594 (21%), 1518 (18%)