traceroute <host> debug-socket
Displays the route that packets take to a network host.
- Explicitly force IPv4 traceouting. By default, the program will try to resolve the name given, and choose the appropriate protocol automatically. If resolving a host name returns both IPv4 and IPv6 addresses, traceroute will use IPv4.
- Explicitly force IPv6 traceouting. By default, the program will try to resolve the name given, and choose the appropriate protocol automatically. If resolving a host name returns both IPv4 and IPv6 addresses, traceroute will use IPv6.
- A host that is the destination for the trace. The host is specified as a name (if DNS is being used on the network), as an IPv4 or IPv6 address, or as a MAC address (format h:h:h:h:h:h:h:h).
- Enables socket level debugging.
- The following entries are options. Multiple options can be included on the same command line.
- Performs AS path lookups in routing registries and print results directly after the corresponding addresses.
- Bypasses the normal routing tables and send directly to a host on an attached network. If the host is not on a directly-attached network, an error is returned. This option can be used to ping a local host through an interface that has no route through it.
- first-ttl value
- Specifies the first time-to-live value. Defaults to 1.
- gateway address
- Routes the request through a specified gateway.
- Uses ICMP echo for the traceroute probe.
- Shows ICMP extensions (rfc4884). The general form is CLASS/TYPE: followed by a hexadecimal dump.
- interface value
- Specifies the interface that the device must use for traceroute requests.
- interval value
- Specifies the time in seconds between traceroute requests from the device.
- max-ttl value
- Specifies the maximum number of hops for the probe.
- Does not fragment the probe packets.
- num-queries number
- Specifies the number of probe packets per hop. The default is 3.
- port number
- For UDP tracing, specifies the destination port base traceroute will use (the destination port number will be incremented by each probe). For ICMP tracing, specifies the initial icmp sequence value (incremented by each probe too). For TCP specifies just the (constant) destination port to connect.
- seq-queries number
- Specifies the number of sequential probe packets.
- source-addr host
- Specifies an alternative source host by hostname, IPv4 address, or MAC address.
- Uses TCP SYN for the probes.
- tos value
- Marks the packets with the specified Type of Service (TOS) value.
- Displays the timestamp during ping output.
- wait-time value
- Specifies the time (seconds) to wait for a response from the probe. Default is 5 seconds.
Use this command to perform a “traceroute” operation for a network host. This operation uses the IP protocol time-to-live (TTL) field and attempts to elicit an Internet Control Message Protocol (ICMP) TIME_EXCEEDED response from each gateway along the path to a host to track the route that a set of packets follows. It attempts to trace the route an IP packet follows to an Internet host by launching User Datagram Protocol (UDP) probe packets with a small time to live, then listening for an ICMP “Time exceeded” reply from a gateway.
The following example illustrates a traceroute to google.com with socket level debugging enabled.
vyatta@vyatta# traceroute google.com debug-socket traceroute to google.com (18.104.22.168), 30 hops max, 60 byte packets 1 gateway.attlocal.net (10.0.6.1) 0.422 ms 0.399 ms 0.498 ms 2 75-25-153-214.uvs.sntcca.sbcglobal.net (22.214.171.124) 16.520 ms 6.484 ms 6.460 ms 3 76-198-128-2.lightspeed.mtvwca.sbcglobal.net (126.96.36.199) 33.529 ms 36.814 ms 26.584 ms 4 188.8.131.52 (184.108.40.206) 26.546 ms 39.056 ms 38.523 ms 5 220.127.116.11 (18.104.22.168) 39.763 ms 30.819 ms 44.405 ms 6 22.214.171.124 (126.96.36.199) 44.407 ms 43.366 ms 43.334 ms 7 * * * 8 188.8.131.52 (184.108.40.206) 28.635 ms 220.127.116.11 (18.104.22.168) 28.293 ms 22.214.171.124 (126.96.36.199) 25.805 ms 9 188.8.131.52 (184.108.40.206) 32.914 ms 34.112 ms 220.127.116.11 (18.104.22.168) 30.330 ms 10 22.214.171.124 (126.96.36.199) 36.979 ms 36.492 ms 38.584 ms 11 188.8.131.52 (184.108.40.206) 37.497 ms 37.496 ms 220.127.116.11 (18.104.22.168) 37.503 ms 12 22.214.171.124 (126.96.36.199) 36.126 ms 36.735 ms 36.686 ms 13 lax02s21-in-f14.1e100.net (188.8.131.52) 34.280 ms 32.453 ms 31.764 ms