JonAB wrote:
OK, I get that there is a 50/50 chance that one of my lags would choose to make it this way. But now, lag1 (router - switch) is choosing a good way 100 % of the time, and lag2 (switch - NAS) is choosing to transmit everything on the same port 100 % of the time...

The decision on which port to use is based on a hash of the source and destination mac addresses in the ethernet packet. So it will be deterministic for a specific LAG. In your particular case, the router is likely rewriting the source mac address.

Note that the transmit decision is made only by the sending device, so flows in the opposite direction can use different ports.

While some implementations give you a couple of alternative ways to make the decision, the GS724 does not. I guess you could try changing to a static lag, and see if the traffic flow changes. But likely the switch will use the same policy. Another thing you could try is removing one port from the router LAG. Then (if you are lucky) these flows will use different ports. But different flows (from different devices) will still end up with sub-optimal load-balancing, so these hacks are only useful if you are trying to optimize these specific flows.

Multigig NICs and switches are the cleanest path, but of course are expensive.

Is there a reason you want local data flows to be routed? Also, what is your ISP internet speed?

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