Netopia 4541, 4542 manual Trace Route, Time

13-4 User’s Reference Guide

time

send Ping packet 1

Netopia

receive Ping packet 1

send return Ping packet 1

Netopia receive return Ping packet 1

send Ping packet 2

Netopia

		receive Ping packet 2
	send Ping packet 3	send return Ping packet 2
Netopia
	receive return Ping packet 2
Netopia
		receive Ping packet 3
		send return Ping packet 3
Netopia	receive return Ping packet 3

host

host

host

host

host

host

Packets Lost: The number of packets unaccounted for, shown in total and as a percentage of total packets sent. 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, and Packets In is noticeably lagging behind Packets Out, the destination is probably unreachable. In this case, use

STOP PING.

Round Trip Time (Min/Max/Avg): Statistics showing the minimum, maximum, and average number of seconds elapsing between the time each Ping packet was sent and the time its corresponding return Ping packet was received.

The time-to-live (TTL) value for each Ping packet sent by the Netopia 4541/4542 is 255, the maximum allowed. The TTL value defines the number of IP routers that the packet can traverse. Ping packets that reach their TTL value are dropped, and a “destination unreachable” notification is returned to the sender (see the table on the previous page). This ensures that no infinite routing loops occur. The TTL value can be set and retrieved using the SNMP MIB-II ip group’s ipDefaultTTL object.

Trace Route

You can count the number of routers between your Netopia Router and a given destination with the Trace Route utility.

In the Statistics & Diagnostics screen, select Trace Route and press Return. The Trace Route screen appears.