I have redirected upload traffic to imq0 by using IMQ in the PREROUTING chain
and download traffic in the POSTROUTING chain to imq1.
Upload traffic --> -i br-lan+tun --> imq0
Download traffic --> -o br-lan+tun --> imq1
IMQ module is set to before NAT in PREROUTING and after NAT in POSTROUTING.
So on which interface should I enable the "nat" option, imq0, imq1, both or
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