David writes:

> I took a closer look at the perl code and I see the cause of the problem.
> Please note I have no DNS. My PCs use DHCP, but are configured in BackupPC
> with the host table's DHCP flag set to zero.
> 
> Here is what I think is happening:
> 
> 1. BackupPC_dump is called periodically at each WakeupSchedule interval.
> 2. BackupPC_dump calls NetBiosHostIPFind which uses NmbLookupFindHostCmd to
> lookup my hosts' Samba names, thereby powering them on.
> 3. It then determines whether or not the host needs to be backed up.
> 
> At this point the only solution I can think of is to modify BackupPC_dump's
> perl code to reverse the order of steps 2 and 3 above, and only invoke
> wake-on-lan if a backup is due.
> 
> I am hoping a more experienced BackupPC user has a better solution that
> doesn't involve modifying the perl code.

You're right - these two steps are backwards and it should be fine
to do them in the order you propose.  However, I can't suggest a
way to do it without modifying the code.  I will fix this.

An alternative is just doing a single wakeup each night, but that
won't work for laptops that aren't connected overnight.  Or you
could do two: one at night and one during the day, minimizing
the likelihood of an extraneous power up.

Craig

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