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Hi!
Firstly thanx a million for clearing my doubts so promptly !( which
prompted me to ask u for a bit more of a clarification :( )
quoting rfc 1631 about The IP Network Address Translator (NAT)
Each NAT box will set aside one global address for tunneling. When a NAT
box x in stub partition X wishes to deliver a packet to stub partition Y, it
will encapsulate the packet in an IP header with destination address set to
the global address of NAT box y that has been reserved for encapsulation.
When NAT box y receives a packet with that destination address, it
decapsulates the IP header and routes the packet internally.
A special table is used to correct the TCP sequence and acknowledge
numbers with source port FTP or destination port FTP. The table entries
should have source, destination, source port, destination port, initial
sequence number, delta for sequence numbers and a timestamp.
Also from the CISCO NAT faq we have :
Q: What is Port Address Translation (PAT), or "NAT overloading"?
A: Also called Port Address Translation (PAT) or port-level multiplexed NAT,
NAT "overload" is used to translate all "internal" (local) private addresses
to a single "outside" (global - usually registered) IP address. Unique port
numbers on each translation are used to distinguish between the
conversations.
With NAT overload, a translation entry containing full address and port
information is created. A port translation may be created if another
translation is using that port number with that outside/global address. This
is necessary in order to eliminate any ambiguity about which translation
needs to be applied to each packet traversing the router.
It was actually this that led me to believe that there was a difference
between NAT concept ...the one used by CISCO and NAT servers (the ones using
the 1:1 mechanism for address translation)
Is it that the case ?If not do reply so as to clarify my questions!
thanx
gokul
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