[zeromq-dev] What protocol does 0mq heartbeat use?

[James Marcus]

Hi,
I'm working through some issues for our engineers and its not clear to me
if the heartbeat is using multicast or ICMP (ping) for the heartbeat?

Our two servers can't communicate but I see ports open. I'm also able to
use omping for multicast testing, as well as ICMP ping.

Any additional thoughts on testing connectivity between two machines would
be great.

Thanks,
James
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