This was tested with security groups with groups that have any traffic allowed - still didn't work. Not ICMP, but IGMP (The Internet Group Management Protocol) - multicast traffic.
Having the instances attached to a external network and internal network, having port security only on the internal network the IGMP traffic still gets dropped on the external network as well.
This was tested with security groups with groups that have any traffic allowed - still didn't work. Not ICMP, but IGMP (The Internet Group Management Protocol) - multicast traffic.
Having the instances attached to a external network and internal network, having port security only on the internal network the IGMP traffic still gets dropped on the external network as well.