Well generally you're going to be putting multicast traffic on a default subnet of something like 224.0.0.0/4. It's pretty easy to filter that out using iptabl

Well generally you're going to be putting multicast traffic on a default subnet of something like 224.0.0.0/4. It's pretty easy to filter that out using iptables as well. I know for keepalived, you're generally only sending out notifications every second or two. Anything higher than that and yeah, you could end up generating some crazy traffic. Here's a typical tcpdump of an advertisement for the curious: 172.20.1.xx > 224.0.0.18: AH(xxxxx): VRRPv2, Advertisement, vrid 51, prio 104, authtype ah, intvl 1s, length 20, addrs: 172.20.1.xx