I would like to do host redirection using nftables, and using maps for
efficient host address lookup (thousands of entries).
As a first step, I tried just natting the output from my laptop but the
real use will be on the prerouting chain:
172.16.0.1 -> 8.8.8.8.
The following works as intended:
nft add table nat
nft add chain nat output { type nat hook output priority 0 \; }
nft add rule nat output ip daddr 172.16.1.1 dnat 8.8.8.8
ping 172.16.1.1
But I can't get it to work using maps - this causes a segmentation error:
nft flush ruleset
nft add table nat
nft add chain nat output { type nat hook output priority 0 \; }
nft add rule ip nat output dnat ip daddr map { 172.16.1.1 : 8.8.8.8 }
nft list ruleset
I don't know if I just have the wrong syntax, if it's a bug in nft, or
if it's just something I shouldn't be trying to do in the first place. I
am using nftables 0.4 (ubuntu 15.10 beta) but had the same result on
ubuntu 15.04.
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