4000 Router Series Layer 3 - IP Services Configuration Guide

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Local IP/port: 200.1.1.3/53

NAT logging:

Log enable : Disabled

Flow-begin : Disabled

Flow-end : Disabled

Flow-active: Disabled

NAT mapping behavior:

Mapping mode: Address and Port-Dependent

ACL : ---

NAT ALG:

DNS: Enabled

FTP: Enabled

H323: Enabled

ICMP-ERROR: Enabled

# Use the display nat session verbose command to display NAT session information generated when

Host accesses the Web server.

[Router] display nat session verbose

Initiator:

Source IP/port: 192.168.1.2/1694

Destination IP/port: 202.38.1.2/8080

VPN instance/VLAN ID/VLL ID: -/-/-

Protocol: TCP(6)

Responder:

Source IP/port: 192.168.1.2/8080

Destination IP/port: 202.38.1.3/1025

VPN instance/VLAN ID/VLL ID: -/-/-

Protocol: TCP(6)

State: TCP_ESTABLISHED

Application: HTTP

Start time: 2012-08-15 14:53:29 TTL: 3597s

Interface(in) : GigabitEthernet1/2

Interface(out): GigabitEthernet1/1

Initiator->Responder: 7 packets 308 bytes

Responder->Initiator: 5 packets 312 bytes

Total sessions found: 1

NAT hairpin in C/S mode

Network requirements

As shown in Figure 58, the internal FTP server at 192.168.1.4/24 provides services for internal and

external users.

Configure NAT hairpin in C/S mode to allow external and internal users to access the internal FTP server.