228 CHAPTER 15: S YSTEM DIAGNOSTICSSystem Diagnostics You can use the various system diagnostic capabilities of the Webcache tohelp you identify any problems that may occur. Ping — Ping other devices on the network. Trace Route — Trace the network hops to a device on your network. System Log — View information about the Webcache.Pinging OtherDevicesThe PING feature allows you to send out PING requests to test whetherdevices on an IP network are accessible and functioning correctly. Thisfeature is useful to diagnose connectivity problems such as a failednetwork device between the Webcache and the web server beingaccessed, or to help diagnose DNS setup problems. For example, if theWebcache cannot access www.mycompany.com, enterwww.mycompany.com in the IP Address/DNS Name field and click Ping. Ifthe IP address for www.mycompany.com appears the DNS server iscontactable and working correctly. The problem is therefore aconnectivity issue between the Webcache and the origin web server.Performing a Ping To ping a device using the Web interface:1 Log in to the Web interface.2 Click Device on the Toolbar.3 Select Protocol > Ping/TraceRoute in the Navigation Tree. ThePing/Traceroute screen is displayed.4 In the IP Address/DNS Name field, enter the IP address or Domain NameServer name of the device that you want to PING. Click Ping.5 The Webcache sends PING requests indefinitely to the specified deviceuntil you click Stop. A message similar to the following is displayed:Starting ping, resolution of displayed time is 10milli-secondsIf the device is accessible and functioning correctly, a message similar tothe following is displayed:64 bytes from 192.168.1.254: icmp_seq=0 ttl=248 time=195.2 msIf the device is not accessible, or is not functioning correctly, a messagesimilar to the following is displayed:No answer from 192.168.1.254dua1611-5aaa04.book Page 228 Friday, November 29, 2002 8:56 PM
