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RFC 1631
http://www.faqs.org/rfcs/rfc1631.html
The IP Network Address Translator (NAT). K. Egevang, P. Francis. May 1994.
RFC 2391
http://www.faqs.org/rfcs/rfc2391.html
Load Sharing Using IP Network Address Translation (LSNAT). P. Srisuresh, D. Gan. August 1998.