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first of all eONS only exists in 188.8.131.52. It is removed in 184.108.40.206. so actually nothing to worry about.
However GI itself uses multicast on the public and on the private interconnect.
On public it is used by mdsnd to share the profile.xml if you change anything in the bootstack (like network parameters or ASM_DISKSTRING).
On private it is used by mdsnd for the same (if there is a problem with multicast on the public) and in 220.127.116.11 for HAIP (redundant interconnect usage).
My question is about what appears to be a public IP address for the "multicast" address. IOW it's not on the interconnect (192.168.x.x) nor is it an address on my corporate network (10.x.x.x). I thought 18.104.22.168 was a public IP address somewhere on the internet. I just discovered however that 234.x.x.x is a unicast address and as such is probably non-routable (still trying to confirm this). It guess it's something recent. The last time I checked on non-routable addresses they were as 10/8, 172.16/16, and 192.168/16. That was years ago though.