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Forums » Hiding Behind Your NAT » Rolling my own
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amenite
The Soylent - It's People
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join:2002-11-21
Ridgewood, NJ
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·Verizon Online DSL

Re: Rolling my own

said by AthlGrond See Profile:
said by amenite See Profile:
The ID in question is the IP id string assigned to each packet by the OS, not the IP address of the NAT device.
Are the IPid's not assigned by the NAT device? Seems like they would have to be. (so the NAT device could send the packets to the correct IP in the LAN)
According to the article, the "IP id" field is generated by the host, and is only used to reassemble fragmented packets. It must be unique among all packets of one protocol that have the same source and destination address (to allow for correct reassembly in case of fragmentation). I am assuming that the NAT device only alters the source IP, or leaves enough of the IP id string intact to allow the technique to work.
--
Time is an abstract concept invented by carbon based life forms to monitor their constant decay.-Thunderclese
permalink · 2003-04-24 16:25:29 · Print · Reply to this

AthlGrond
Premium,MVM
join:2002-04-25
Aurora, CO

Re: Rolling my own

Thanks, I reread it and much clearer now. You are correct.
permalink · 2003-04-24 17:01:38 · Reply to this
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