Provides information about network latency and network loss at intermediate hops between a source and destination. Pathping sends multiple Echo Request messages to each router between a source and destination over a period of time and then computes results based on the packets returned from each router. Because pathping displays the degree of packet loss at any given router or link, you can determine which routers or subnets might be having network problems. Pathping performs the equivalent of the tracert command by identifying which routers are on the path. It then sends pings periodically to all of the routers over a specified time period and computes statistics based on the number returned from each. Used without parameters, pathping displays help.
pathping [-n] [-h MaximumHops] [-g HostList] [-p Period] [-q NumQueries [-w Timeout] [-T] [-R] [TargetName]
-n : Prevents pathping from attempting to resolve the IP addresses of intermediate routers to their names. This might expedite the display of pathping results.
-h MaximumHops : Specifies the maximum number of hops in the path to search for the target (destination). The default is 30 hops.
-g HostList : Specifies that the Echo Request messages use the Loose Source Route option in the IP header with the set of intermediate destinations specified in HostList. With loose source routing, successive intermediate destinations can be separated by one or multiple routers. The maximum number of addresses or names in the host list is 9. The HostList is a series of IP addresses (in dotted decimal notation) separated by spaces.
-p Period : Specifies the number of milliseconds to wait between consecutive pings. The default is 250 milliseconds (1/4 second).
-q NumQueries : Specifies the number of Echo Request messages sent to each router in the path. The default is 100 queries.
-w Timeout : Specifies the number of milliseconds to wait for each reply. The default is 3000 milliseconds (3 seconds).
-T : Attaches a layer-2 priority tag (for example, 802.1p) to the Echo Request messages that it sends to each of the network devices along the route. This helps to identify network devices that do not have layer-2 priority capability. This switch is used to test for Quality of Service (QoS) connectivity.
-R : Determines whether each network device along the route supports the Resource Reservation Protocol (RSVP), which allows the host computer to reserve a specified amount of bandwidth for a data stream. This switch is used to test for Quality of Service (QoS) connectivity.
TargetName : Specifies the destination, which is identified either by IP address or host name.
/? : Displays help at the command prompt.
The following example shows pathping command output:
D:\>pathping -n corp1 Tracing route to corp1 [10.54.1.196] over a maximum of 30 hops: 0 172.16.87.35 1 172.16.87.218 2 192.168.52.1 3 192.168.80.1 4 10.54.247.14 5 10.54.1.196 Computing statistics for 125 seconds... Source to Here This Node/Link Hop RTT Lost/Sent = Pct Lost/Sent = Pct Address 0 172.16.87.35 0/ 100 = 0% | 1 41ms 0/ 100 = 0% 0/ 100 = 0% 172.16.87.218 13/ 100 = 13% | 2 22ms 16/ 100 = 16% 3/ 100 = 3% 192.168.52.1 0/ 100 = 0% | 3 24ms 13/ 100 = 13% 0/ 100 = 0% 192.168.80.1 0/ 100 = 0% | 4 21ms 14/ 100 = 14% 1/ 100 = 1% 10.54.247.14 0/ 100 = 0% | 5 24ms 13/ 100 = 13% 0/ 100 = 0% 10.54.1.196 Trace complete.
When pathping is run, the first results list the path. This is the same path that is shown using the tracert command. Next, a busy message is displayed for approximately 90 seconds (the time varies by hop count). During this time, information is gathered from all routers previously listed and from the links between them. At the end of this period, the test results are displayed.
In the sample report above, the This Node/Link, Lost/Sent = Pct and Address columns show that the link between 172.16.87.218 and 192.168.52.1 is dropping 13 percent of the packets. The routers at hops 2 and 4 also are dropping packets addressed to them, but this loss does not affect their ability to forward traffic that is not addressed to them.
The loss rates displayed for the links, identified as a vertical bar (|) in the Address column, indicate link congestion that is causing the loss of packets that are being forwarded on the path. The loss rates displayed for routers (identified by their IP addresses) indicate that these routers might be overloaded.