Realtek LAN vs Intel LAN, GBE injection

Does only Intel LAN firmware provide Ipsec hop-by-hop network security with L2 encryption ? or maybe Realtek also does ?
If so did someone see a GBE region for realtek LAN with active Ipsec support in PCH strap 0 then?
Maybe someone also tried to inject a GBE region taken from different vendor to unsupported bios image? Please share here