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Learn how to install, configure, and operate Vyatta Network Operating System (Vyatta NOS), which helps to drive our virtual networking and physical platforms portfolio.

traceroute <host> tcp-syn

Displays the route that packets take to a network host.

traceroute[ipv4|ipv6]hosttcp-syn[options]
ipv4
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.
ipv6
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.
host
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).
tcp-syn
Uses TCP SYN for the probes.
options
The following entries are options. Multiple options can be included on the same command line.
as-path
Performs AS path lookups in routing registries and print results directly after the corresponding addresses.
bypass-routing
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.
debug-socket
Enables socket level debugging.
first-ttlvalue
Specifies the first time-to-live value. Defaults to 1.
gatewayaddress
Routes the request through a specified gateway.
icmp-echo
Uses ICMP echo for the traceroute probe.
icmp-extensions
Shows ICMP extensions (rfc4884). The general form is CLASS/TYPE: followed by a hexadecimal dump.
interfacevalue
Specifies the interface that the device must use for traceroute requests.
intervalvalue
Specifies the time in seconds between traceroute requests from the device.
max-ttlvalue
Specifies the maximum number of hops for the probe.
no-fragment
Does not fragment the probe packets.
num-queriesnumber
Specifies the number of probe packets per hop. The default is 3.
portnumber
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-queriesnumber
Specifies the number of sequential probe packets.
source-addrhost
Specifies an alternative source host by hostname, IPv4 address, or MAC address.
tosvalue
Marks the packets with the specified Type of Service (TOS) value.
version
Displays the timestamp during ping output.
wait-timevalue
Specifies the time (seconds) to wait for a response from the probe. Default is 5 seconds.

Operational mode

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 using tcp-syn for probes.

vyatta@vyatta# traceroute google.com tcp-syn
traceroute to google.com (74.125.224.6), 30 hops max, 60 byte packets
1  gateway.attlocal.net (10.0.6.1)  0.389 ms  0.341 ms  0.316 ms
2  75-25-153-214.uvs.sntcca.sbcglobal.net (75.25.153.214)  12.784 ms  12.767 ms  12.771 ms
3  76-198-128-2.lightspeed.mtvwca.sbcglobal.net (76.198.128.2)  35.539 ms  35.529 ms  35.517 ms
4  71.145.0.192 (71.145.0.192)  35.512 ms  35.503 ms  33.653 ms
5  12.83.39.189 (12.83.39.189)  38.888 ms  36.371 ms  37.952 ms
6  12.122.136.181 (12.122.136.181)  63.947 ms  63.087 ms  63.045 ms
7  * * *
8  216.239.49.168 (216.239.49.168)  28.752 ms  29.378 ms  29.368 ms
9  * * *
10  nuq04s18-in-f6.1e100.net (74.125.224.6)  29.669 ms  27.836 ms  29.669 ms