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NETSELECT(1) General Commands Manual NETSELECT(1) NAME netselect - choose the fastest server automatically SYNOPSIS netselect [-v|-vv|-vvv|-vvvv] [-m HOPS] [-s SERVERS] [-t PACKETS] host ... DESCRIPTION netselect determines several facts about all of the hosts given on the command line, much faster than you would if you manually tried to use ping and traceroute. For each host, netselect figures out the approximate ping time (though not as accurately as ping does), the number of network "hops" to reach the target, and the percentage of ping requests that got through suc- cessfully. Then netselect calculates the "score" of each operational host based on these values. A lower score is better, in the end it prints one line showing the server with the best score. EXAMPLES # netselect -vv ftp.fceia.unr.edu.ar ftp.kulnet.kuleuven.ac.be \ ftp.cdrom.com ftp.debian.org ftp.de.debian.org This is the output: ftp.fceia.unr.edu.ar 2792 ms 23 hops 100% ok ( 1/ 1) [ 9213] ftp.kulnet.kuleuven.ac.be 9999 ms 30 hops 0% ok ftp.cdrom.com 94 ms 8 hops 100% ok (10/10) [ 169] ftp.debian.org 46 ms 15 hops 100% ok (10/10) [ 115] ftp.de.debian.org 9999 ms 30 hops 0% ok 115 ftp.debian.org The value in brackets is the "score" of each operational host based on these values. A lower score is better. The last line shows the server with the best score. If we had not used '-vv' on the command line, only this last line would have been printed. Note that for ftp.kulnet.kuleuven.ac.be and ftp.de.debian.org in this case, nothing got through at all. That indicates that either the host doesn't exist, or it is down. OPTIONS -v Verbose mode. Displays nameserver resolution messages to stderr. You probably want this so that you don't get bored waiting for a hundred name resolutions to finish. -vv Very verbose mode. Displays nameserver resolution and statis- tics (not just scores) to STDERR and STDOUT. -vvv Very very verbose mode. Everything -vv prints, plus it print every packet received as it happens. Good for debugging or try- ing to figure out how it works. -vvvv Very very very verbose mode. Everything -vvv prints, plus a trace of all packets sent. -m HOPS Maximum TTL (time to live). Don't accept hosts that are further than HOPS away. -s SERVERS Print this many "top-scoring" SERVERS at the end of the list. If SERVERS is 0, then this disables printing of high scores. -t PACKETS Make sure at least 50% of the hosts get tested with this many PACKETS. The more packets you use, the more accurate are the results... and the longer it takes to run. The default is 10, which is usually okay. -I Use ICMP instead of UDP probes. In some occassions (firewalled hosts) UDP probes like those used in traceroute will get fil- tered out and hosts might be perceived as dead. Using this op- tion will make netselect use ICMP probes instead. SEE ALSO ping(8), traceroute(8), netselect-apt(1). AUTHOR Avery Pennarun <apenwarr@gmail.com> DEBIAN March 14, 2004 NETSELECT(1)
NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | OPTIONS | SEE ALSO | AUTHOR
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