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A quick search turned up this:
Patent # 6,985,440
Network address translation using a forwarding agent
Abstract
A system and method are disclosed for specifying network address
translation for a set of packets. A first set of instructions is sent to
a forwarding agent specifying criteria for designated packets that are
designated to undergo network address translation. A matching packet is
received from the forwarding agent that matches the specified criteria.
A network address translation scheme is determined for the matching
packet. A second set of instructions are sent specifying the network
address translation scheme for packets associated with the matching packet.
Link to it:
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=6,985,440.WKU.&OS=PN/6,985,440&RS=PN/6,985,440
There is a 10-15 cross referenced in this one if this doesn't fit. Not
being an expert in NAT or patents hope this helps :)
-John
Roberto Nibali wrote:
On top of that I believe there is still a patent issue with regard to
VRRP. Cisco is holding it.
Alexandre knew about this and contacted cisco before writing keepalived.
He was reassured that he would have no problems.
The people who wrote CARP apparently weren't convinced.
I remember. Wouldn't it be nice to consolidate it? I know one of the
CARP guys personally, I could ask him.
cisco has the patent on NAT (I believe). Why haven't they asserted it?
Hmm, I think this would be very difficult to assert, or even to file a
patent for. Don't you think that they rather filed a patent for a
specific method of implementing NAT?
They should be able to make mucho $ out of that.
Does anybody know the specific patent no.? So we could check. Someone
with enough time could try:
http://www.uspto.gov/patft/index.html
http://164.195.100.11/netahtml/search-adv.htm
Regards,
Roberto Nibali, ratz
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