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etrace(8) FreeBSD System Manager's Manual etrace(8)

etrace - print the route packets take to a network host

etrace [ -BbCcnv ] [ -p profile ] [ -F config ] [ -i interface ] [ -I icmp-type ] [ -T port ] [ -U port ] [ -P protocol ] [ -r probe-count ] [ -t timeout ] [ -1 hop ] [ -h hop ] [ -m hop ] [ -A address ] [ -s port ] [ -f flags ] [ -d data ] [ -D data-file ] [ -R count ] [ -q seq ] [ -w window ] target [...]

etrace is a configurable static port network tracing tool, similar to traceroute, but supporting ICMP, TCP, UDP and other IP protocols.

etrace has a wealth of options ranging in function from controlling output to the detailed construction of trace packets.
A profile is a pre-configured list of options stored in a shared, or user specific configuration file. By defining profiles, complex etrace option sets can be easily accessed with a single command line option.
-p, --profile
Specify a profile.
-C, --clear
Clear the current list of probes. This option can be used to allow a profile to inherit options from another profile, but specify it's own list of probes.
-F, --config
Specify an alternative profiles file.
-i, --interface
Specify interface. If unspecified, etrace will examine the routing table and select the most appropriate interface for each target address.
-c, --promisc
Put in interface into promiscuous mode. As this option increases the load on the system in general, it should only be used if spoofing of source packets address is enabled with the "-A" option.
-I, --icmp
Specify an ICMP trace and the packet type to use. ICMP traces may use Echo (E or P), Timestamp (T or S), Netmask (N or M) or Info (I). The default trace probe is an ICMP Echo.
-T, --tcp
-U, --udp
Specify either a TCP or UDP trace and the port to use.
-P, --protocol
Specify a protocol type other than TCP, UDP or ICMP.
-1, --initial
Specify the initial hop.
-h, --hop
Specify a specific hop to investigate.
-m, --maximum
Specify the maximum number of hops.
-r, --probes
Set the maximum number of probes to send per hop. The default is 3.
-t, --timeout
Set the maximum amount of time, in milli-seconds, to wait for a response to a probe. The default is 3000 (three seconds).
-A, --address
Specify the source IP address of generated packets.
-s, --source
Set the source port of the generated probe packets. If unspecified, etrace uses a random high port.
-f, --flags
Specify TCP and/or IP flags. Takes a comma delimitered list of any of the following flags: RF, DF, MF, FIN, SYN, RST, PSH, ACK, URG, ECE, CWR (Default: SYN)
-d, --data
Specify the data content of generated probe packets. Standard meta-characters are recognised (e.g. "\n\t") as are binary values given in octal (e.g. "\000\x00");
-D, --data-file
Load the data content of the generated probe packets from the specified file. Filenames beginning with '@' a loaded from the etrace shared data directory (usually /usr/local/share/etrace). etrace currently ships with the following predfined packet data files: dns, ike.
-R, --random
Fill the data content of the generated probe packets with the specified number of random bytes.
-b, --badcksum
Generate and send probe packets with bad checksums.
-q, --seq
Specify the TCP sequence number.
-w, --window
Specify the TCP window size.
-v, --verbose
Increase output verbosity.
-B, --debug
Enable debugging output.
-n, --numeric
Turn off name resolution

Launches a trace ICMP Echo, the default, trace to Specifiying the options "-I E" whould accomplish the same results.
etrace -T 80
Similar to the previous example, except the trace is performed on TCP port 80.
etrace --udp 53 --data-file @dns
Starts are trace to on UDP port 53 with the trace packets containing data loaded from the file /usr/local/share/etrace/dns (a file supplied with etrace that contains a simple dns request to resolve
etrace -p dns -p fast
The default profiles shipped with etrace include "dns" (which equates to the options shown in the previous example) and "fast" (which decreases both timeouts and the number of probes sent for each hop, as well as disabling name resolution). Profiles are stackable, with latter options overriding those specified in earlier profiles.

User specific profiles.
System wide profiles.

Dave Armstrong <>

The latest version of etrace can be obtained from:
8 July 2006

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