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Any VPS host, or EC2, will let you run ZeroMQ in whatever way is appropriate to your problem.

edit: and same for if you run your own server or rent a server, obviously

However, many services won't let you make full use of it; e.g. last year when I tried to get multicast between my EC2 nodes, it discovered it was unsupported.

If you're only using ZeroMQ in tcp or inproc mode, it is nice, but in a pub/sub scenario you are wasting a lot of bandwidth and CPU time.

Can you explain why you're wasting a lot of bandwidth/CPU time in pub/sub?

if you're not using multicast in pub sub, you're establishing individual tcp connections between nodes, it's not any different than doing N point to point communications, whereas with multicast, the data is only copied when needed, your data will fan out if that makes sense with your network topology I think if you look at the picture it'll be clear

http://en.wikipedia.org/wiki/Multicast

But when you have to add the second ZeroMQ (say, two Linode VPSs), how do you secure communication between those nodes?

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