Conversation:
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I have managed to bork #IPv4 routing at home. Only #IPv6 working now. The internet is such a small place now .(
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I'm experimdnting with router split personality. "macvlan" interfaces to enable multiple DHCP addresses, but they hijack each other?!
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.........hm. I see. I figured forwarding would be necessary to let them talk through each other, but now that I think about it I guess I've misunderstood _how_ the separation is done in the kernel.
And documentation is poor, but I found some kernel docs I can read to perhaps understand better.
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The routes for each interface remove the other. When eth1 gets a gateway, which is the same as eth2's, it removes eth2's gateway. So I have to manually add it back after either interface has renewed its DHCP lease.