Print the route packets take to network host.
Syntax traceroute [options] host [packetsize] Options: -I Use ICMP ECHO for probes -T Use TCP SYN for probes -U Use UDP datagrams for probes (default). Only UDP is allowed for unprivileged users. -d Enable socket level debugging (when the Linux kernel supports it) -F Set the "Don't Fragment" bit. This tells intermediate routers not to fragment the packet when they find it's too big for a network hop's MTU. -f first_ttl With what TTL to start. Default = 1 -g gateway Adds an IP source route gateway to the outgoing packet. Not useful, as most routers have disabled this for security reasons. -i interface The interface through which traceroute should send packets. Default = select according to the routing table. -m max_ttl The max no. of hops (max time-to-live value) traceroute will probe. Default=30 hops -N squeries The number of probe packets sent out simultaneously. Sending several probes concurrently can speed up traceroute considerably. Default = 16 Note that some routers and hosts can use ICMP rate throttling. In such a situation specifying too large number can lead to loss of some responses. -n Show numerical addresses; do not look up hostnames. (Useful if DNS is not functioning properly.) -p port For UDP tracing: the destination port base traceroute will use (the destination port number will be incremented by each probe). For ICMP tracing: the initial icmp sequence value (incremented by each probe). For TCP tracing: the (constant) destination port to connect. -t tos For IPv4, set the Type of Service (TOS) and Precedence value. Useful values are 16 (low delay) and 8 (high throughput). Note that in order to use some TOS precendence values, you have to be super user. For IPv6, set the Traffic Control value. -w waittime Set the time (in seconds) to wait for a response to a probe (default 5.0 sec). -q nqueries Set the number of probe packets per hop. Default = 3 -r Bypass 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. -s source_addr Choose an alternative source address. You must select the address of one of the interfaces. Default = address of the outgoing interface. -z sendwait Minimal time interval between probes (default 0). If the value is more than 10, then it specifies a number in milliseconds, else it is a number of seconds (float point values allowed too). Useful when some routers use rate-limit for icmp messages. -A Perform AS path lookups in routing registries and print results directly after the corresponding addresses -V Print the version and exit. --help Print help info and exit. -4, -6 Explicitly force IPv4 or 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 IPv4.
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