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Forum Discussion
Issues with LACP with VLANs
Hi all, Network newbie here. I am having some trouble with VLAN's combined with LACP. The setup I have at the moment are purely for educating my self. It consists of: One Netgear GS724Tv4 On...
I will start answering your last questions. There is no real reason. At the moment, I am using the setup purely for educational purposes. I want to try different setups to test my understanding, and when I do run into troubles like this, take the chance to learn something! My ISP is nothing special, 300/300...
"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."
I think this is it! When the router is transmitting the flows, the MACs and IPs are changed. Instead of having unique MACs and IPs, both flows now have the same MAC and IP. This is making the switch to decide to transmit them on the same port...
All right. What should I do instead? Let's say that I want a segmented network for increased security. Let's say that I have different VLANs for different clients. Let's say that I have a NAS serving multiple purposes (of course with multiple pools for the corresponding client group). Of course I want to make use of that the NAS has 4 gigabit connection for maximum bandwidth with multiple clients
I think this is it! When the router is transmitting the flows, the MACs and IPs are changed. Instead of having unique MACs and IPs, both flows now have the same MAC and IP. This is making the switch to decide to transmit them on the same port...
I agree that is likely it. But I do want to point out that the hash uses both the source and destination MAC addresses in the packet. Both flows would have the same source MAC leaving the router, but they would still have the different destination MACs.
All right. What should I do instead?
At the end of the day, LAGs on the switch won't load-balance perfectly, no matter what you do in the config.
If you set up a static lag on the switch <-> synology, you could probably also set up round-robin on the synology. That would fully load-balance on the outbound path from the synology (but not the inbound path). But you could end up with buffer overruns in your clients (or in other LAGs), which will result in packet loss.
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