Information Technology Reference
In-Depth Information
IP packets requiring reassembly
TCP active opens
ICMP input errors
ICMP outgoing redirects
6.
Close the pop-up window when complete.
How It Works
View TCP/IP statistics when you want to troubleshoot issues such as network bottlenecks or to
provide a basic level of monitoring of the traffic that is being directed through your router. The
statistics window in the GUI provides a snapshot of the statistics at the time the window was
requested. You can right-click anywhere on the window to refresh the statistics.
If you want a real-time view of TCP/IP statistics, you should consider using Windows'
built-in Performance Monitor. You can run this from the Performance icon in the Administra-
tive Tools folder, or from the Start
Run menu by typing
perfmon.exe
. All of the counters that
were described in this recipe are also available in Performance Monitor within the IPv4 and the
ICMP objects.
If you suspect that your router is not functioning properly or that there is a problem with
the traffic being directed through or at your router, you may want to analyze the various metrics.
Let's look at the case of IP traffic as an example. One of the first statistics you will want to look
at is IP Datagrams Received. This represents the total number of datagrams that were received
on an interface, including those datagrams that may have been problematic. Compare this to
IP Datagrams Forwarded, which represents the datagrams that were forwarded by the router to
a different network, or IP Datagrams Failing, and you will obtain a sense for the flow of traffic
on this interface.
Of course, it is a lot more helpful when troubleshooting if you first have baseline statistics
for comparison purposes. Spend some time immediately after installing your router, during a
time of “average” traffic, to view the statistics. Use these later when measuring the router's
performance to determine if it has degraded or if the amount and nature of the traffic has
changed significantly.
➤
See Also
Microsoft TechNet: “IP Object” (
http://technet2.microsoft.com/WindowsServer/en/Library/
046ed8bf-9f3d-42a7-b56a-f279495203f11033.mspx)
. This article provides a list of IP performance-
counter objects and their descriptions.
5-11. Configuring an IGMP Interface
Problem
You want to configure an IGMP interface to support multicasts.
