1.1.1 with
the translation entry global address and forwards the packet.
Step 4 Host B receives the packet and responds to host 1.1.1.1 by using the
inside global IPv4 destination address 2.2.2.2 (DA 2.2.2.2).
Step 5 When the router receives the packet with the inside global IPv4 address,
the router performs a NAT table lookup by using the inside global
address as a key. The router then translates the address back to the inside
local address of host 1.1.1.1 and forwards the packet to host 1.1.1.1. Host
1.1.1.1 receives the packet and continues the conversation. The router
performs Steps 2 through 5 for each packet.
The order in which the router processes traf?¬?c depends on whether the NAT translation
is a global-to-local translation or a local-to-global translation. Table 7-1 illustrates the order
in which a router processes traf?¬?c, depending on the direction of the translation.
Table 7-1 Router Processing Order
Local-to-Global Global-to-Local
1. Check input access list if using IPsec1.
2. Perform decryption??”for Cisco
Encryption Technology or IPsec.
3. Check inbound access list.
4. Check input rate limits.
5. Perform input accounting.
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