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-c count -l device -i seconds -f
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Specifies the number of packets to be sent. The ping command terminates automatically after reaching this number. Specifies the name of the network device that should be used. Useful on a computer with several network devices. Specifies the number of seconds to wait between individual ping packets. The default setting is 1 second. Sends packets as fast as possible, but only after a reply comes in. Continued
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Table 8-1. Continued
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Sends packets without waiting for a reply. If used with the -f option, this may cause a denial-of-service attack on the target host and the host may stop functioning properly or even crash. Apart from the unknown harm that this may do to the target server, you may find yourself blacklisted or even charged with a criminal offense. Because this is such a very dangerous option, only the user root is allowed to use it. Sets the time to live (TTL) for packets that are sent. This indicates the maximum number of routers that each packet may pass through on its way to a destination. The TTL is decremented by one by each router it passes until the TTL becomes 0, which means that the packet won t be routed any more. Sends packets to the broadcast address of the network. This prompts a reply from every host that s up and allowed to answer to ping packets.
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-t ttl
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Note To protect against a denial-of-service attack, many hosts are configured not to answer a ping
request. Therefore, when testing connectivity, make sure that you use a host that s allowed to answer.
The ping command is not just used to test that a connection can be established; you can also use it to check the roundtrip delay between your computer and a given host. The elapsed time is an important indication of the quality of the network connection. To check the roundtrip delay, have a look at the time parameter that s listed in the result of the ping command. Listing 8-12 provides an example in which ping is used to send four packets to www.ubuntu.com. Listing 8-12. Testing Connectivity to www.ubuntu.com root@ZNA:~# ping -c 4 www.ubuntu.com PING www.ubuntu.com (82.211.81.158) 56(84) bytes of 64 bytes from arctowski.ubuntu.com (82.211.81.158): 64 bytes from arctowski.ubuntu.com (82.211.81.158): 64 bytes from arctowski.ubuntu.com (82.211.81.158): 64 bytes from arctowski.ubuntu.com (82.211.81.158): data. icmp_seq=1 icmp_seq=2 icmp_seq=3 icmp_seq=4
ttl=51 ttl=51 ttl=51 ttl=51
time=22.0 time=10.7 time=18.6 time=20.8
ms ms ms ms
--- www.ubuntu.com ping statistics --4 packets transmitted, 4 received, 0% packet loss, time 3015ms rtt min/avg/max/mdev = 10.741/18.092/22.057/4.417 ms
Testing Routability
If you can ping your default router but you can t ping a given host on the Internet, it s probably obvious that something is wrong with one of the routers between your network and the destination host. You can use the traceroute command to find out exactly where things are going wrong. The traceroute command uses the TTL value of the UDP datagrams it sends out.
CHAPTER 8 MAKING CONNECTION
Note A datagram is a packet sent over the OSI model network layer.
The idea is that, when the TTL value reaches 0, the packet is discarded by the router and a message is sent back to the sender. When starting, traceroute uses a TTL value of 0, which causes the packet to be discarded by the very first router. This is how traceroute identifies the first router. Next, it sends the packet to the target destination again, but with a TTL of 1, which, as you can see, causes the packet to be discarded by the second router. Things continue in this manner until the packet reaches its final destination. To use traceroute, you normally put the host name as the argument, such as traceroute www.ubuntu.com. It s possible as well to use the IP address of a host, which will produce a result as seen in Listing 8-13. Listing 8-13. Testing a Network s Route with traceroute root@ZNA:~# traceroute www.ubuntu.com traceroute to www.ubuntu.com (82.211.81.158), 30 hops max, 40 byte packets 1 192.168.1.254 (192.168.1.254) 72.668 ms 10.361 ms 176.306 ms 2 195.190.249.90 (195.190.249.90) 3.353 ms 9.199 ms 10.351 ms 3 42.ge-4-0-0.xr1.3d12.xs4all.net (194.109.5.49) 6.386 ms 7.237 ms 16.421 ms 4 0.so-6-0-0.xr1.tc2.xs4all.net (194.109.5.10) 11.407 ms 11.447 ms 9.599 ms 5 217.149.46.21 (217.149.46.21) 31.989 ms 29.321 ms 22.756 ms 6 sl-bb21-ams-8-0.sprintlink.net (217.149.32.41) 13.415 ms 13.244 ms 12.569 ms 7 213.206.131.46 (213.206.131.46) 11.147 ms 12.282 ms 11.222 ms 8 ae-0-56.mp2.Amsterdam1.Level3.net (4.68.120.162) 7.862 ms ae-0-54.mp2.Amster\ dam1.Level3.net (4.68.120.98) 11.796 ms ae-0-52.mp2.Amsterdam1.Level3.net\ (4.68.120.34) 11.000 ms 9 as-0-0.bbr2.London2.Level3.net (4.68.128.110) 21.047 ms ae-1-0.bbr1.London2.\ Level3.net (212.187.128.46) 35.125 ms as-0-0.bbr2.London2.Level3.net\ (4.68.128.110) 17.183 ms 10 ae-15-53.car1.London2.Level3.net (4.68.117.79) 18.917 ms 17.388 ms ae-25-52.\ car1.London2.Level3.net (4.68.117.47) 18.992 ms 11 tge9-3-146.core-r-1.lon2.\ mnet.net.uk (212.187.196.82) 14.699 ms 17.381 ms 15.293 ms 12 85.133.32.134 (85.133.32.134) 27.130 ms 33.310 ms 37.576 ms 13 82.211.81.76 (82.211.81.76) 16.784 ms 20.140 ms 17.556 ms 14 * * * 15 * * * 16 * * * 17 * * * With the traceroute command, you ll see every router that s passed. For each router, the name of the router is displayed, followed by its IP address and then the roundtrip times of the three packets that were sent to that router. You ll often see that a router replies with only a string of three asterisks (* * *), which indicates that the router forwards packets normally but is configured not to reply to ping packets for security reasons.
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