NETGEAR FR314 Reference Manual page 126

Reference Guide for the Model FR314, FR318 and FV318 Cable/DSL Firewall and VPN Routers
From a local PC, initiate an IP session with the remote host using an IP client, such as Web,
4.
FTP, or Telnet.
Do not enter a host name, such as "www.yahoo.com"; instead, type the same IP address
entered in the "Trace on IP address" box.
Click Refresh.
5.
The packet trace information is displayed.
Click Stop to terminate the packet trace, and Reset to clear the results.
6.
Note: Packet Trace requires an IP address for the target host. You can use the DNS Name Lookup
tool to find the IP address of a host.
To interpret the results of this tool, it is necessary to understand the three-way handshake that
occurs for every TCP connection. A typical three-way handshake initiated by a host on the firewall
router's LAN to a remote host on the WAN is shown below.
1 TCP received on LAN [SYN]
From 192.168.0.3 / 1282 (00:a0:4b:05:96:4a)
To 204.71.200.74 / 80 (02:00:cf:58:d3:6a)
The firewall router receives SYN from LAN client.
2 TCP sent on WAN [SYN]
From 207.88.211.116 / 1937 (00:40:10:0c:01:4e)
To 204.71.200.74 / 80 (02:00:cf:58:d3:6a)
The firewall router forwards SYN from LAN client to remote host.
3 TCP received on WAN [SYN,ACK]
From 204.71.200.74 / 80 (02:00:cf:58:d3:6a)
To 207.88.211.116 / 1937 (00:40:10:0c:01:4e)
The firewall router receives SYN,ACK from remote host.
4 TCP sent on LAN [SYN,ACK]
From 204.71.200.74 / 80 (02:00:cf:58:d3:6a)
To 192.168.0.3 / 1282 (00:a0:4b:05:96:4a)
The firewall router forwards SYN,ACK to LAN client.
5 TCP received on LAN [ACK]
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