11-27-2006
Traceroute will allow you to test connectivity. Basically, it'll show you the steps a package takes to reach a machine. For this purpose, it uses UDP (default), though depebnding on the version you can choose ICMP. Also depending on the version , you can choose the port. Have a look at traceroute man page for more info. I've mentioned this tool because sometimes the problem is not sockets related but a network issue.
Regards.
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LEARN ABOUT DEBIAN
traceroute
TRACEROUTE(1) User Commands TRACEROUTE(1)
NAME
traceroute - Trace the route to a host
SYNOPSIS
traceroute [OPTION...] HOST
DESCRIPTION
Print the route packets trace to network host.
-f, --first-hop=NUM
Set initial hop distance, that is the time-to-live.
-g, --gateways=GATES
List of gateways for loose source routing.
-I, --icmp
Use ICMP ECHO as probe.
-m, --max-hop=NUM
Set maximal hop count (default is 64).
-M, --type=METHOD
Use METHOD (icmp or udp) for traceroute operations, defaulting to udp.
-p, --port=PORT
Use destination PORT port (default is 33434).
-q, --tries=NUM
Send NUM probe packets per hop (default is 3).
--resolve-hostnames
Resolve hostnames.
-t, --tos=NUM
Set type of service (TOS) to NUM.
-w, --wait=NUM
Wait NUM seconds for response (default is 3).
-?, --help
Give this help list.
--usage
Give a short usage message.
-V, --version
Print program version.
GNU inetutils 2015-05-15 TRACEROUTE(1)