IP Services
NAT / PAT Lab
Walk through inside local vs inside global, static and dynamic NAT, PAT overload with port translation, command building, and reading translation tables — with animated packets across the lab topology.
NAT / PAT Lab
Static NAT, dynamic NAT, PAT overload, translation tables, and configuration — animated like Packet Walk 2.0.
R1 G0/0 (inside) 192.168.10.1/24 · LAN-A .10.10/.10.20 · Server .20.10
R1 G0/1 (outside) 203.0.113.2/30 → ISP 203.0.113.1 → Internet
Pool: 203.0.113.100–110 · Static server: 203.0.113.20
NAT changes IP addressing. PAT also changes source port numbers.
The ACL in a NAT overload command selects traffic to translate. It is not the same teaching point as an interface security ACL.
Return traffic must match the translation table or the router will not know which inside host should receive it.
Inside Local
The private IP address of an inside device before translation.
Example: 192.168.10.10
Verification commands
show ip nat … and related checks