NAT IPv4, pass through IPv6?

Pierre Abbat phma at
Tue Nov 3 18:45:23 PST 2015

I have a box with two NICs, em0 and em1, and a wireless called wlan0 which is 
an IWN. Originally it was my gateway, with em0 connected to the WAN and em1 to 
the LAN, and ran the IPv6 tunnel. Now I'm on a connection with eight IPv4 
addresses (five usable) and a /64 of IPv6. I'm thinking ahead. I may want to 
add more computers to the network. Let's say that zyxomma has on em0 these 
IPv6: 2001:dead:beef:c0de:123:4567:89ab:cdef
I'd like to add another computer, connected to em1, and it should get the 
IPv6: 2001:dead:beef:c0de:bead:edff:fede:cade
where the IPv4 address is handed out by zyxomma, but the IPv6 address is 
handed out by the satellite modem. Is this possible?

What's the status of IWN support? I tested a fix a few years ago which got the 
kernel to recognize the interface, but it couldn't turn on the carrier, or 
couldn't tell that there was a carrier. That's where it is now, but I haven't 
compiled the kernel lately.

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