A while back I started on a quest to make cake 'nat' aware as the lack of host fairness in a typical home router environment was the only thing that prevented cake from being the ultimate qdisc in my opinion. This involves dealing with conntrack which on egress is easy (the kernel fills in a data structure for us), ingress is less clear. I hacked something together but wasn't really happy with it.

Another github user 'tegularius' presented some beautifully crafted code that did the lookups in a much neater way. Originally it too had an 'ingress' lookup problem. This was worked on and I hacked some conditional 'denat' options into cake & tc.

For your 'delight' a denat cake along with a matching tc

Typically I use 'dual-srchost srcnat' options on the egress interface, with 'dual-dsthost dstnat' in the ingress ifb interface. In *brief* testing, bandwidth is shared fairly between hosts, and fairly by flow within each host. And it's not crashed yet.

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