I ended up getting a new router with more static slots...
Kris Lou wrote at about 11:47:57 -0700 on Thursday, August 8, 2013:
> Question for Jeff:
>
> I know this is an old thread (and still in my archives!), but I'm wondering
> if this worked for you?
>
> I have a similar situation - I have a laptop that needs to be backed up. I
> currently have it configured for wired backups, but the user more often
> uses wifi (DMZ) and then VPN's into the network. If the symlink method
> works out, I can issue a static IP via the VPN.
>
> Thanks,
>
> -Kris
>
>
> Kris Lou
> klou AT themusiclink DOT net
>
>
> On Mon, Jan 16, 2012 at 3:44 PM, Jeffrey J. Kosowsky
> <backuppc AT kosowsky DOT org>wrote:
>
> > Jeffrey J. Kosowsky wrote at about 17:00:45 -0500 on Monday, January 16,
> > 2012:
> > > The laptops I back up have both a wired and wireless Ethernet
> > > connection with (different) MAC addresses.
> > >
> > > I use static DNS so that when the laptops are attached at home they
> > > are given a fixed (known) IP address so that BackupPC can find them
> > > using my /etc/hosts file.
> > >
> > > On my old D-Link router, I used to assign the same static DNS address
> > > to both MAC addresses so that no matter which connection was used, I
> > > had the same fixed IP address.
> > >
> > > The problem is that my new Verizon router does not allow the same IP
> > > address to be correlated with different MAC addresses.
> > >
> > > So now it seems that I can only match the laptop name (used by
> > > BackupPC) against only one of the IP addresses so that it will only
> > > get backed up on one of the two interfaces?
> > >
> > > Is there any simple way to overcome this problem?
> > >
> > > For example would it be possible to match 2 IP/names addresses against
> > > the same host backup so that if one fails then it tries the other?
> > > (this is in a sense the opposite of ClientNameAlias that allows you to
> > > map multiple hosts to one IP address)
> > >
> >
> > Just was thinking that the following simple hack should probably
> > work...
> >
> > 1. Set up two different static IPs, one for each network interface.
> > 2. Enter both IPs (or equivalent names as defined in /etc/hosts) in
> > the BackupPC/hosts file -- call them 'hostA' and 'hostB'
> > 3. Create a *symlink* from TopDir/pc/hostB to TopDir/pc/hostA
> >
> > Then whenever the *common* backup host ages, BackupPC will launch a
> > new backup -- either hostA or hostB depending on which NIC is
> > currently active (note: I am assuming that only one interface is
> > active at a time). That way if one IP addressdidn't back up then the
> > other would back up in place using the same history of numbered full
> > and incremental backups. Once either backup completed then both hosts
> > would look updated since they both point to the same common pc host
> > subdirectory of backups. Note that the host name doesn't appear at all
> > except as the name of the top level directory in the pc tree, so it
> > makes no difference whether the backup is initiated as hostA or
> > hostB.
> >
> > The only potential issue would be collisions but even that typically
> > shouldn't
> > happen since I assume that only one IP address is ever active at one
> > time. Potentially there might be issues if the user switched interfaces in
> > the middle of a backup before the first version complete or timed out
> > but hopefully the new backup would catch the other as a partial backup
> > and either continue from there or erase it... still I imagine there
> > could be weird edge cases though they would only occur if you switched
> > network interfaces mid-backup...
> >
> >
> >
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