Network; Network Connectivity Test - 3Com 4200G 12-Port Configuration Manual

43
Network Connectivity
Test
ping
tracert
N
ETWORK
You can use the ping command to check the network connectivity and the
reachability of a host.
Table 322 The ping command
Operation Command
Check the IP network ping [ -a ip-address ] [ -c count ] [ -d ] [
connectivity and the -f ] [ -h ttl ] [ -i { interface-type
reachability of a host interface-number } ] [ ip ] [ -n ] [ - p
pattern ] [ -q ] [ -r ] [ -s packetsize ] [ -t
timeout ] [ -tos tos ] [ -v ] host
This command can output the following results:
Response status for each ping packet. If no response packet is received within the
■
timeout time, the message "Request time out" is displayed. Otherwise, the
number of data bytes, packet serial number, TTL (time to live) and response time of
the response packet are displayed.
Final statistics, including the numbers of sent packets and received response
■
packets, the irresponsive packet percentage, and the minimum, average and
maximum values of response time.
You can use the tracert command to trace the gateways a packet passes during its
journey from the source to the destination. This command is mainly used to check the
network connectivity. It can help you locate the trouble spot of the network.
The executing procedure of the tracert command is as follows: First, the source host
sends a data packet with the TTL of 1, and the first hop device returns an ICMP error
message indicating that it cannot forward this packet because of TTL timeout. Then,
the source host resends the packet with the TTL of 2, and the second hop device also
returns an ICMP TTL timeout message. This procedure goes on and on until the
packet gets to the destination. During the procedure, the system records the source
address of each ICMP TTL timeout message in order to offer the path that the packet
passed through to the destination.
Table 323 The tracert command
Operation Command
Trace the gateways a tracert [ -a source-IP | -f first-ttl | -m
packet passes from the max-TTL | -p port | -q num-packet | -w
source host to the timeout ] string
destination
C
ONNECTIVITY
T
EST
Description
You can use this
command in any view.
Description
You can execute the
tracert command in any
view.