01-27-2013
Sorry? If you run your loop over the 10 hosts in your code snippet, for every host responding it will execute the then branch and increment cnt in there, so cnt will hold the No. of active hosts afterwards. Did you give it a shot, after all?
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LEARN ABOUT DEBIAN
vde_tunctl
VDE_TUNCTL(8) System Manager's Manual VDE_TUNCTL(8)
NAME
vde_tunctl -- create and manage persistent TUN/TAP interfaces
SYNOPSIS
vde_tunctl [-f tun-clone-device] [-u owner] [-t device-name]
vde_tunctl [-f tun-clone-device] -d device-name
DESCRIPTION
vde_tunctl allows the host sysadmin to preconfigure a TUN/TAP device for use by a particular user. That user may open and use the device,
but may not change any aspects of the host side of the interface.
vde_tunctl is a simple copy of tunctl done for practical purposes.
USAGE
To create an interface for use by a particular user, invoke tunctl without the -d option:
# vde_tunctl -u someuser
Set 'tap0' persistent and owned by uid 500
Then, configure the interface as normal:
# ifconfig tap0 192.168.0.254 up
# route add -host 192.168.0.253 dev tap0
# bash -c 'echo 1 > /proc/sys/net/ipv4/conf/tap0/proxy_arp'
# arp -Ds 192.168.0.253 eth0 pub
To delete the interface, use the -d option:
# vde_tunctl -d tap0
Set 'tap0' nonpersistent
SEE ALSO
vde_switch(1) vde_plug2tap(1)
AUTHOR
tunctl was written by Jeff Dike jdike@karaya.com
This manual page is based on tunctl manual page written by Matt Zimmerman mdz@debian.org for the Debian GNU/Linux system.
VDE_TUNCTL(8)