rfc 2663 - regarding

dear all ,

I am having a small doubt in the following example for
twice NAT from rfc 2663.


The twice NAT located at the Private site border may
   be configured as follows:

 
Private to Public : 200.200.200.0/24 -> 138.76.28.0/24
Public to Private : 200.200.200.0/24 -> 172.16.1.0/24

Datagram flow  : Host_A(Private) ->  Host_X(Public)

a) Within private network

   DA: 172.16.1.100      SA: 200.200.200.1

b) After twice-NAT translation

  DA: 200.200.200.100    SA: 138.76.28.1

Datagram flow Host_X (Public) -> Host_A (Private)

a) Within Public network

   DA: 138.76.28.1       SA: 200.200.200.100

b) After twice-NAT translation, in private network

   SA: 200.200.200.1     DA: 172.16.1.100

 - the author says SA & DA refers to source and
destination address , if that is the case then for the
datagram flow from public -> private  , after
twice-NAT translation ( i.e b) ) it should be 

DA : 200.200.200.1       SA: 172.16.1.100

Is this a "document error" OR the author means to say
something in the given line .Please tell me what the
given lines says and doesnt it mean.

thank you for your attention

Regards 
venkatakrishnan  

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