Slide 5 of 5
Notes:
1. Name lookup from X.external.com for A.private.com
a. Name lookup for A.private.com crosses NAT. Note that binding is created here for DNSe external->external’ (1-4)
b. Reply crosses NAT (5-6)
-- change A records private->private’ [assign]
-- assume private’ assignment is 131.108.1.1
2. Reverse name lookup from X.external.com for 131.108.1.1
a. Reverse name lookup crosses NAT. Note that binding is created here for DNSe external->external’ (1-4)
-- change PTR in query private’->private
b. Reply crosses NAT (5-6)
-- change PTR in query private->private’
-- change A records private->private’ [assign]
