Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Fujitsu/MB9BF61xT/ETHERNET_MAC0/rxipv6_gd_octets#0x0
“Number of bytes received in good IPv6 datagrams encapsulating TCP, UDP or ICMPv6 data”
https://github.com/cmsis-svd/cmsis-svd-data