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If either your ISP exposes that ability or if you maintain multiple outbound connections, then yes. But I don't think this is commonly implemented today, however.

You would probably have to configure your own routing table to direct traffic for each application through the appropriate link, but that's completely doable as long as you can write rules to distinguish the packets (for example based on destination).

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Yes I can imagine using iptables to work but it was my understanding that this would only be able to determine the next hop and I couldn’t get it to force the decision higher up the chain. This would mean that every party along the chain has to play ball.

I can imagine that it would be beneficial for the internet experience if we could segregate low latency traffic (human/hft) traffic from hulk traffic such as video. Although this goes against net neutrality I suppose.

If you want it to be done externally without setting up a routing table then the next best option would be some kind of traffic tagging to indicate what you want to go over which line. That would start looking like a network with multiple VLAN:s.

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