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There are several troubleshooting tools available for determining problem information, such as links or devices that are down, loops in your network, and/or poor routing statements A few of these tools are discussed in the following sections
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The Internet Control Message Protocol (ICMP) was defined by the Department of Defense as part of the Internet layer protocols ICMP serves four functions: flow control, unreachable destination alerts, redirecting routes, and checking remote hosts The ICMP echo message, also known as ping, sends a packet to a specific destination and requests a response Using the MAC and IP address, and the ping-defined destination IP address, the request is sent If the destination is connected to the network and receives the request, it will respond This send-and-respond process will occur five times Successful responses are represented by am exclamation mark (!), and unsuccessful responses by a period () The ping command also provides statistics on the success rate, as well as the minimum, average, and maximum milliseconds it took for the ping packet to travel from source to destination and back to source Here is an example of a successful ping: vsigate#ping 101113 Type escape sequence to abort Sending 5, 100-byte ICMP Echos to 101113, timeout is 2 seconds:
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!!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms Here is an unsuccessful ping: vsigate#ping 1011253 Type escape sequence to abort Sending 5, 100-byte ICMP Echos to 1011253, timeout is 2 seconds: Success rate is 0 percent (0/5) If your ping command is not successful, check the following factors: Is the destination physically plugged into the network Is there a link light on the destination's NIC Does the destination have the correct default gateway Does the destination default gateway have the correct routes Does the source have the correct default gateway Does the source default gateway have the correct routes Is there some type of router access list or firewall intercepting the traffic that may be blocking ICMP Are the interfaces up on all applicable network devices (no port failure has occurred) Are the subnet masks correct If fixing any of the above possible problems does not fix your inability to ping, the traceroute or extended ping commands may be useful Extended ping allows you to set some additional parameters, including the source of the ping command An example of extended ping is shown here: vsigate#ping Protocol [ip]:<Enter> Target IP address: 209989898 Repeat count [5]:<Enter> Datagram size [100]:<Enter> Timeout in seconds [2]:<Enter> Extended commands [n]: y Source address or interface: 10111 Type of service [0]:<Enter> Set DF bit in IP header [no]:<Enter> Validate reply data [no]:<Enter> Data pattern [0xABCD]:<Enter> Loose, Strict, Record, Timestamp, Verbose[none]: <Enter> Sweep range of sizes [n]:<Enter> Type escape sequence to abort Sending 5, 100-byte ICMP Echos to 209989898, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 16/16/16 ms
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The traceroute command is similar to ping, except it defines the hops included in its path to the destination When the ping command is unsuccessful, entering the traceroute command shows you the hops defined by the network routing statements that choose the route the packets will take If the packets are being blocked or not being routed correctly, the trail of hops will help you determine which network device is blocking packets or has incorrect routing information In addition to the hops, traceroute also discloses the latency between hops This is particularly useful in determining possible bottlenecks in your network
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Telnet is the login and terminal-emulation protocol that operates over TCP/IP networks Its primary function is to facilitate users' login to remote host systems By having this capability, you can establish a Telnet session at multiple hosts along a path and perform testing at each step For instance, if you are unsuccessful getting from point A to point B, verifying connectivity at each hop from point A to B may help identify a possible point of failure
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