Cloud Computing Networking

350 Cloud ComPuting networking

9.3.1 NAT Technology

When transmitting an IP packet from a computer on the private network to a com-

puter on the public network, the IP packet contains the private source IP address and

the public destination IP address. As the packet moves across the router that connects

the private network and the Internet, NAT replaces the private source IP address

Table 9.18 Updated Routing Information after Fifth Routing Information Exchange

FROM

R1

TO

R1

TO

R2

TO

R3

TO

R4

TO

R5

TO

R6

FROM

R2

TO

R1

TO

R2

TO

R3

TO

R4

TO

R5

TO

R6

via R1 0 2 6 3 via R1 8 8 5 11

via R2 10 10 7 13 via R2 2 0 11

via R3 via R3 17 19 14 14

via R4 14