Backup Central

Hi,

The idea to use ping to check if the client is a laptop or a desktop is a
nice idea. But some desktops have a firewall that doesn't give an answer if
you ping it. 'arping' on root level always works.

Is there a posability to use 'arping' instead of ping? Because you can not
call the arping command as a simple user, you have to be root for it.

An other problem that might occure is the following. Some laptops or PC's
are dual boot, meaning it uses or linux or windoze. Is there a possability
to let BackupPC check this and make two seprate backups of the windoze part
and the linux part?

thanks
klaas

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Am Freitag, 18. Juni 2004 14:09 schrieb ciccio
Hi,

The idea to use ping to check if the client is a laptop or a desktop is a
nice idea. But some desktops have a firewall that doesn't give an answer
if you ping it. 'arping' on root level always works.


Is there a posability to use 'arping' instead of ping? Because you can not
call the arping command as a simple user, you have to be root for it.

of course, you can use sudo to run programs with super-user privilidges
without password as user.

use "visudo" to edit your sudoers configuration... add something like that:

backuppc ALL=NOPASSWD: /usr/local/bin/arping

Then you should also set:
$Conf{PingPath} = '/bin/ping';
$Conf{PingCmd} = '$pingPath -c 1 -w 3 $host';
in the backuppc config to the "arping" parameters.
.
But I guess that this is not working without patching backuppc a bit. arpping
gives other output as ping does.

# arping -c 1 08:00:46:BF:76:0C
ARPING 08:00:46:BF:76:0C
60 bytes from 10.0.0.9 (08:00:46:bf:76:0c): icmp_seq=0 time=4.401 msec

--- 08:00:46:BF:76:0C statistics ---
1 packets transmitted, 1 packets received, 0% unanswered

# ping -c 1 10.0.0.9 -w 3
PING 10.0.0.9 (10.0.0.9) 56(84) bytes of data.
64 bytes from 10.0.0.9: icmp_seq=1 ttl=64 time=3.61 ms

--- 10.0.0.9 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 3.613/3.613/3.613/0.000 ms

(arping doesn't show "rtt min/avg/max/mdev" times.)


An other problem that might occure is the following. Some laptops or PC's
are dual boot, meaning it uses or linux or windoze. Is there a possability
to let BackupPC check this and make two seprate backups of the windoze part
and the linux part?

Not really... A simple solution is to use diffrent IPs on linux & windows.


thanks
klaas


--Ralph


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Ralph Pa gang writes:

Am Freitag, 18. Juni 2004 14:09 schrieb ciccio

The idea to use ping to check if the client is a laptop or a desktop is a
nice idea. But some desktops have a firewall that doesn't give an answer
if you ping it. 'arping' on root level always works.


Is there a posability to use 'arping' instead of ping? Because you can not
call the arping command as a simple user, you have to be root for it.

of course, you can use sudo to run programs with super-user privilidges
without password as user.

use "visudo" to edit your sudoers configuration... add something like that:

backuppc ALL=NOPASSWD: /usr/local/bin/arping

Then you should also set:
$Conf{PingPath} = '/bin/ping';
$Conf{PingCmd} = '$pingPath -c 1 -w 3 $host';
in the backuppc config to the "arping" parameters.
.
But I guess that this is not working without patching backuppc a bit. arpping
gives other output as ping does.

# arping -c 1 08:00:46:BF:76:0C
ARPING 08:00:46:BF:76:0C
60 bytes from 10.0.0.9 (08:00:46:bf:76:0c): icmp_seq=0 time=4.401 msec

--- 08:00:46:BF:76:0C statistics ---
1 packets transmitted, 1 packets received, 0% unanswered

# ping -c 1 10.0.0.9 -w 3
PING 10.0.0.9 (10.0.0.9) 56(84) bytes of data.
64 bytes from 10.0.0.9: icmp_seq=1 ttl=64 time=3.61 ms

--- 10.0.0.9 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 3.613/3.613/3.613/0.000 ms

(arping doesn't show "rtt min/avg/max/mdev" times.)

Yes, the output is different. It would be pretty easy to write
an external script that runs arping and reformats the output.
Then there are no changes to BackupPC.

Also, another approach if all the machines are known to be on the
network is to not run ping at all. Just set $Conf{PingCmd} to
anything that returns a 0 exit status, eg: '/bin/echo'.

Craig


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