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Zorluk: OrtaInside Source NAT and PAT Configuration and Verification

A network administrator is configuring Port Address Translation (PAT) on a Cisco IOS router to allow hosts on the private subnet 172.16.20.0/24172.16.20.0/24 to access the Internet using an IP NAT pool named `PAT_POOL` with the public address 198.51.100.10198.51.100.10. Which TWO commands are required to successfully complete this dynamic PAT pool configuration?

  1. ip nat inside source list 15 pool PAT_POOL overloadCevap
  2. ip nat pool PAT_POOL 198.51.100.10 198.51.100.10 netmask 255.255.255.252Cevap
  3. C
    ip nat inside source list 15 pool PAT_POOL
  4. D
    access-list 15 permit 172.32.20.0 0.0.0.255

Cevap

The configuration requires defining the dynamic IP NAT pool using `ip nat pool PAT_POOL 198.51.100.10 198.51.100.10 netmask 255.255.255.252` and referencing that pool in the NAT source translation statement with the `overload` keyword appended: `ip nat inside source list 15 pool PAT_POOL overload`.
Configuring PAT using a dynamic NAT pool requires defining the pool parameters via `ip nat pool <name> <start-ip> <end-ip> netmask <mask>` and linking an access list that identifies private traffic to that pool using `ip nat inside source list <acl> pool <name> overload`. The `overload` keyword enables multiplexing multiple internal sockets onto a single public address using port numbers.

Adım Adım Çözüm

1
Define the public NAT address pool
Configured `ip nat pool PAT_POOL 198.51.100.10 198.51.100.10 netmask 255.255.255.252` to specify the public IPv4 address available for outbound translation.
A pool must exist before dynamic NAT/PAT mapping rules can reference it by name.
2
Bind the access list to the pool with port overload enabled
Executed `ip nat inside source list 15 pool PAT_POOL overload`.
The `overload` keyword instructs Cisco IOS to perform Port Address Translation (PAT), allowing multiple inside private hosts to share the single pool address by tracking unique TCP/UDP port numbers.

Anahtar Kavram

Port Address Translation (PAT) Pool Configuration Syntax
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