Re: internet connection tester script
On Sat, 27 Mar 2010 13:07:14 +0100, Jozsef Vadkan jozsi.avad...@gmail.com
wrote:
Why doesn't my internet-connection script work?
When I plug the ethcable out, it just waits...and waits...and waits...
It doesn't even work correctly: Now as I definitely have
Internet connection, it prints NO INTERNET CONNECTION.
Allow me a comment:
#!/bin/bash
This is Linux. It is not portable. FreeBSD is NOT Linux.
In FreeBSD, the standard scripting shell is the Bourne
shell /bin/sh. Unless you don't require things that are
specific to bash, use the correct shebang for shm which is
#!/bin/sh
If you intendedly want to use bash, specify it correctly:
#!/usr/local/bin/bash
The bash is an additional package for FreeBSD, it does not
belong to the OS itself. It needs to be installed. Of
course, there's a way to make bash available as /bin/bash
statically linked, but with all thoughts to interoperability,
I wouldn't rely on this.
Let me bring the script into a more easily readable form
and allow me to say something about it:
#!/bin/sh
function internet_connection_ok
{
echo Testing internet connectionplease wait...
if ping -W 1 -c 4 bix.hu | grep -q 4 received; then
if ping -W 1 -c 4 www.yahoo.com | grep -q 4 received; then
echo NET is OK
else
echo NO INTERNET CONNECTION
exit 1
fi
else
echo NO INTERNET CONNECTION
exit 1
fi
}
internet_connection_ok
Basically, you're relying on a 100 % correct reception of
pings from two specified host to see if Internet is up and
running. In case of package loss, even with running Internet
(e. g. 4 sent, 3 received), the script would say that there's
no Internet connection, which is false. Additionally, you're
giving only 1 ms for reply, which may not be enough for a
slow (but stable) connection. Finally, you're relying on
DNS to get the IPs to ping for bix.hu and www.yahoo.com.
I'm not sure if this resolve time is important here, too.
--
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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Re: internet connection tester script
I prefer to use `host' command
ping take time to run, especially when it do not respond...
here's my script
r...@omega ~ : cat /usr/local/bin/check_connectivity
13:43
#!/bin/sh
# checks local and internet connectivity
# faust - 2010/02/17
host google.com /dev/null
if [ $? -eq 0 ];
then
net=1
echo Internet connection is UP
else
net=0
echo Internet connection is DOWN
fi
host alpha.faust-network /dev/null
if [ $? -eq 0 ];
then
local=1
echo Local network is UP
else
local=0
echo local network is DOWN
fi
case `expr $local '*' 2 + $net` in
0) exit 2 ;; # big nothing
1) exit 42 ;; # just internet (uhu?)
2) exit 1 ;; # just local
3) exit 0 ;; # all right!
*) exit 43 ;; # divided by zero?
esac
Samuel Martín Moro
{EPITECH.} tek4
CamTrace S.A.S
On Sat, Mar 27, 2010 at 1:22 PM, Polytropon free...@edvax.de wrote:
On Sat, 27 Mar 2010 13:07:14 +0100, Jozsef Vadkan jozsi.avad...@gmail.com
wrote:
Why doesn't my internet-connection script work?
When I plug the ethcable out, it just waits...and waits...and waits...
It doesn't even work correctly: Now as I definitely have
Internet connection, it prints NO INTERNET CONNECTION.
Allow me a comment:
#!/bin/bash
This is Linux. It is not portable. FreeBSD is NOT Linux.
In FreeBSD, the standard scripting shell is the Bourne
shell /bin/sh. Unless you don't require things that are
specific to bash, use the correct shebang for shm which is
#!/bin/sh
If you intendedly want to use bash, specify it correctly:
#!/usr/local/bin/bash
The bash is an additional package for FreeBSD, it does not
belong to the OS itself. It needs to be installed. Of
course, there's a way to make bash available as /bin/bash
statically linked, but with all thoughts to interoperability,
I wouldn't rely on this.
Let me bring the script into a more easily readable form
and allow me to say something about it:
#!/bin/sh
function internet_connection_ok
{
echo Testing internet connectionplease wait...
if ping -W 1 -c 4 bix.hu | grep -q 4 received; then
if ping -W 1 -c 4 www.yahoo.com | grep -q 4 received;
then
echo NET is OK
else
echo NO INTERNET CONNECTION
exit 1
fi
else
echo NO INTERNET CONNECTION
exit 1
fi
}
internet_connection_ok
Basically, you're relying on a 100 % correct reception of
pings from two specified host to see if Internet is up and
running. In case of package loss, even with running Internet
(e. g. 4 sent, 3 received), the script would say that there's
no Internet connection, which is false. Additionally, you're
giving only 1 ms for reply, which may not be enough for a
slow (but stable) connection. Finally, you're relying on
DNS to get the IPs to ping for bix.hu and www.yahoo.com.
I'm not sure if this resolve time is important here, too.
--
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
___
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Re: internet connection tester script
Jozsef Vadkan wrote: Why doesn't my internet-connection script work? When I plug the ethcable out, it just waits...and waits...and waits... The script: http://pastebin.com/AE9U1qdL As someone has noted, you're waiting on ping to timeout a bunch of times. And really, I'm not sure why this script is needed. In ~/.cshrc: alias upping -t3 yahoo.com ... or something (your .bashrc equivalent, or .shrc, etc.) should do the trick, with much less effort on all fronts. HTH, Kevin Kinsey ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: internet connection tester script
FWIW, here's what I use. Requires net/fping. #!/bin/sh target=ip.address.of.next.hop.out echo - Started at `date` is_dead=0 while true; do fping -q $target fping_rc=$? if [ $is_dead -eq 0 -a $fping_rc -gt 0 ]; then echo ! Failure at `date` is_dead=1 fi if [ $is_dead -eq 1 -a $fping_rc -eq 0 ]; then echo Alive at `date` is_dead=0 fi sleep 30 done -- James. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
