Contributed by pitrh on from the states of confusion dept.
It’s possible to misuse NAT to load balance outbound traffic across multiple internet connections from different service providers,see the Load Balance Outgoing Traffic section of PF FAQ.
The shortfall with this configuration is when implemented alongside unstable links, forwarding will continue to be attempted over the links which are down, this will cause issues such as long hangs for users behind the NAT while connections time out. To mitigate this,
ifstatedcan be used to smooth things over.
Read the rest at geeklan.co.uk, Sevan's blog site.
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