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Network Problems
If problems disappear on the local segment but return as soon as you involve the larger
network, the problem may lie in the network itself. There are several tests you can run to
troubleshoot problems between remote sites, even if you are unable to test local
videoconferences.
Verify the Problem is with the Network
1. Reduce the speed of the videoconference to the lowest level possible (64K or 128K). If
the videoconference runs well at this lower speed but has problems at higher speed, the
network is suspect.
2. Try the videoconference at different times of day. Because network use varies over a
24-hour period, videoconferences may work better at some times of day than others. If
you find a videoconference works well during "off" hours, such as early morning, but
fails at busy times (typically late morning or mid-afternoon), the network is suspect.
3. Try a network route that has fewer router hops, such as across a leased line or an
alternate ISP. To determine the number of router hopes, run a traceroute ("tracer
Ipaddr" on a PC, "tr Ipaddr" on a UNIX system). If the videoconference behaves better
on a connection with fewer routers, the network is at fault.
Debug the Network
Network debugging is the domain of the network administrator and is not addressed in this
document. Contact your system administrator for assistance.
Analyzing Problems
9-5
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