with 127.0.0.1 might require tuning with net.local.stream.* and would
consume more memory if set high.
so far i've noticed with 127.0.0.1 browsing seems like faster than the
other, but im not sure what I've missed.
rdr on em1 inet proto tcp from any to ! (em1) port = http -> 127.0.0.1 port
3128
or
rdr on em1 inet proto tcp from any to ! (em1) port = http -> $em1ip port
3128
but which one is better in terms of memory consumption.
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