3Com Switch 8800 Advanced Software V5 Configuration Guide

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NAT Configuration Example 1001

<Sysname> system-view

[Sysname] userlog nat syslog

# Enable the NAT log function on Device A.

[Sysname] nat log enable

# View the log buffer to monitor access records.

[Sysname] quit

<Sysname> dir

Directory of cf:/

0 -rw- 16850028 Aug 07 2009 04:02:42 mainpack.bin

1 drw- - Aug 07 2005 05:13:48 logfile

2 -rw- 1747 Aug 07 2009 04:05:38 config.cfg

3 -rw- 524288 Aug 13 2009 01:27:40 basicbtm.bin

4 -rw- 524288 Aug 13 2009 01:27:40 extendbtm.bin

249852 KB total (232072 KB free)

File system type of cf: FAT32

<Sysname> cd logfile

<Sysname> more logfile.log

......omitted......

%@250005%Jul 7 04:20:04:72 2005 Sysname USERLOG/7/NAT:

ICMP; 192.168.1.6:768--->1.1.1.1:12288; 2.2.2.2:768;

[2005/07/07 04:20:03-0000/00/00 00:00:00];

Operator 8: Data flow created

%@250006%Jul 7 04:20:10:72 2005 Sysname USERLOG/7/NAT:

ICMP; 192.168.1.6:768--->1.1.1.1:12288; 2.2.2.2:768;

[2005/07/07 04:20:03-2005/07/07 04:20:09];

Operator 1: Normal over

%@250007%Jul 7 04:20:30:72 2005 Sysname USERLOG/7/NAT:

ICMP; 192.168.1.6:768--->1.1.1.1:12288; 2.2.2.2:768;

[2005/07/07 04:20:29-0000/00/00 00:00:00];

Operator 8: Data flow created

......omitted......

Apart from NAT logs, the log file includes other system logs. The following table

shows the description of NAT logs:

Field Description

ICMP ICMP

192.168.1.6:768 Source IP address and port number before

translation

1.1.1.1:12288 Source IP address and port number after translation

2.2.2.2:768 Destination IP address and port number

2005/07/07 04:20:03

2005/07/07 04:20:29

Start time of the NAT session (In this example, the

time displayed is the device’s system time. When the

logs are exported in UDP packet, the UDP packet

records the interval in seconds between the current

system time and Greenwich time 0 AM, Jan 1

1970. The log server, based on its own system time,

converts this interval and exports it.

2005/07/07 04:20:09

0000/00/00 00:00:00

End time of the NAT session

0000/00/00 00:00:00 means that this time is

uncertain.