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changelog 2.6.11
[PATCH] Remove Randomness in Selecting NAT IP Address
We currently choose a "random" IP address to NAT to, where we have a
range. Martin Josefsson pointed out that he uses the SAME target in
iptables because changing IP addresses breaks Internet banking sites
(among others) which assume the customer will be coming from a
consistent IP address.
In fact, we spend a fair bit of effort trying to balance the number of
connections we NAT to each IP address. We can come pretty damn close
just hashing the source and destination IP addresses, and it has the
consistency property which is so desirable, as well as being faster."