This Wireshark plugin dissects GRE over UDP protocol (RFC 8086), with GRE extensions defined by RIST main profile (VSF TR-06-02). It works when GRE headers are not encrypted (no DTLS).
To use it-
- Place 'gre_over_udp.lua' in the Wireshark program folder
- Include it at the end of 'init.lua' with: dofile(DATA_DIR.."gre_over_udp.lua")
It opens an option of "GREoUDP" in the "Decode as..." dialog. It arbitrarily register UDP port 5000 by default.