15-4 Administration GuidePackets Lost: The number of packets unaccounted for, shown in total and as a percentage of total packetssent. This statistic may be updated during the Ping test, and may not be accurate until after the test is over.However, if an escalating one-to-one correspondence is seen between Packets Out and Packets Lost, andPackets In is noticeably lagging behind Packets Out, the destination is probably unreachable. In this case, useSTOP PING.Round Trip Time (Min/Max/Avg): Statistics showing the minimum, maximum, and average number ofseconds elapsing between the time each Ping packet was sent and the time its corresponding return Pingpacket was received.The time-to-live (TTL) value for each Ping packet sent by the Netopia 4752 is 255, the maximum allowed. TheTTL value defines the number of IP routers that the packet can traverse. Ping packets that reach their TTL valueare dropped, and a “destination unreachable” notification is returned to the sender (see the table on theprevious page). This ensures that no infinite routing loops occur. The TTL value can be set and retrieved usingthe SNMP MIB-II ip group’s ipDefaultTTL object.Trace RouteYou can count the number of routers between your Netopia Router and a given destination with the Trace Routeutility.In the Statistics & Diagnostics screen, select Trace Route and press Return. The Trace Route screen appears.To trace a route, follow these steps:1. Select Host Name or IP Address and enter the name or address of the destination you want to trace.2. Select Maximum Hops to set the maximum number of routers to count between the Netopia Router andthe destination router, up to the maximum of 64. The default is 30 hops.3. Select Timeout (seconds) to set when the trace will timeout for each hop, up to 10 seconds. The default is3 seconds.Trace RouteHost Name or IP Address:Maximum Hops: 30Timeout (seconds): 5Use Reverse DNS: YesSTART TRACE ROUTEEnter the IP Address/Domain Name of a host.Trace route to a network host.
