Dell SonicWALL GX250 Manual page 77

1. Select Ping from the Choose a diagnostic tool menu.
2. Enter the IP address of the target device to ping and click Go. The test takes a few
seconds to complete. Once completed, a message showing the results is displayed
in the browser window.
Note: Ping requires an IP address. The SonicWALL DNS Name Lookup tool may be
used to find the IP address of a host.
Packet Trace
The Packet Trace tool tracks the status of a communications stream as it moves from
source to destination. This is a useful tool to determine if a communications stream is
being stopped at the SonicWALL, or is lost on the Internet.
To interpret this tool, it is necessary to understand the three-way handshake that
occurs for every TCP connection. The following displays a typical three-way handshake
initiated by a host on the SonicWALL's LAN to a remote host on the WAN.
1. TCP received on LAN [SYN]
From 192.168.168.158 / 1282 (00:a0:4b:05:96:4a)
To 204.71.200.74 / 80 (02:00:cf:58:d3:6a)
The SonicWALL 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)
SonicWALL Internet Security Appliance Guide Page 77