3Com 3C13636 Configuration Manual page 62

3Com Router 3000 Ethernet Family
Configuration Guide
For example:
<3Com> ping 202.38.160.244
ping 202.38.160.244 : 56 data bytes, press CTRL-C to break
Reply from 202.38.160.244 : bytes=56 sequence=1 ttl=255 time = 1ms
Reply from 202.38.160.244 : bytes=56 sequence=2 ttl=255 time = 2ms
Reply from 202.38.160.244 : bytes=56 sequence=3 ttl=255 time = 1ms
Reply from 202.38.160.244 : bytes=56 sequence=4 ttl=255 time = 3ms
Reply from 202.38.160.244 : bytes=56 sequence=5 ttl=255 time = 2ms
--202.38.160.244 ping statistics--
5 packets transmitted
5 packets received
0% packet loss
round-trip min/avg/max = 1/2/3 ms
II. tracert
tracert is used to test the gateways that a packet sent by the host will pass by in order
to reach the destination. It is mainly used to test whether a network connection is
reachable and to locate the position where faults occur on the network.
The tracert command is executed following this procedure: The system first sends a
packet with TTL as 1 and the first hop returns an ICMP error message indicating that
the packet cannot be transmitted due to TTL timeout. Then the system transmits the
packet again with TTL being set to 2 and the second hop returns TTL timeout message
similarly. This process continues until the packet reaches its destination. The purpose
of such a process is to record the source addresses where these ICMP TTL timeout
messages are sent to outline the path along which the IP packet can reach the
destination.
Perform the following operation in any view.
Table 2-10 Trace the gateways between a source host and a destination host
Trace the gateways between a source
host and a destination host
For more information about the options and parameters of the command, refer to the
section introducing the tracert command in the Command Manual.
Following are examples of using tracert for network analysis.
Example 1:
<3Com> tracert 35.1.1.48
traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
Operation
3Com Corporation
2-14
Chapter 2 System Maintenance Management
Command
tracert [-a X.X.X.X ] [ -f first_TTL ] [ -m
max_TTL ] [ -p port ] [ -q nqueries ]
[ vpn-instance vpn-instance-name ] [ -w
timeout ] host