On both a dd-wrt and a recent asus router I have successfully got the
older bonding module to bring up wireless and wired in a
active/passive mode (wired is active if there). Both interfaces
would have the same IP and mac address and I can unplug the wired and
immediately have it switch over to wireless with no obvious drops.
I can also switch back to a wired connection with no drops (usually
done in the middle of a big data transfer to speed it up). This is
outside of network manager, and was a major pain to get it working
consistently after a reboot, but I believe it now works consistently
on reboots. I believe the bonding module does force arps when it
switches interfaces.
On Tue, Feb 3, 2015 at 8:37 AM, Andrew R Paterson
<andy.paterson(a)ntlworld.com> wrote:
On Wednesday 04 February 2015 00:55:29 Tim wrote:
> Jim Lewis wrote:
> >> Quick question about DHCP reservations: I have laptops with both
> >> wired and wireless NICs, is it okay to have the router assign the
> >> same IP to both interface?
>
> I wrote:
> > I seem to recall being able to do that, with the DHCP server on my
> > Fedora Core 4 installation (having two separate MAC matching clauses
> > that applied the same IP). Other servers may try to prevent you doing
> > that, as it can be problematic.
>
> Just following up, since I wasn't clear. My comment was along the same
> lines as the original poster, trying to see what would happen if I
> assigned the same IP to wireless or wired network interfaces on my
> laptop, where only one of them would be active at any one time.
>
> The reason I tried, was that it was annoying having changing addresses,
> one way or another. Whether that was the IP address, or the named
> address attached to the current IP.
>
> For instance, my hostname might be
wired.example.com or
>
wireless.example.com, because the IP changed. Either change brought
> about their own set of nuisances.
>
> And, no, the common Fedora approach of associating your desired machine
> hostname against 127.0.0.1 is not a sensible alternative, either.
>
> Having multiple interfaces is a nuisance, and the best I could come up
> with was having to use the GUI to manually disconnect one device or the
> other, not letting any automatic system attempt it.
>
> A whole slew of other problems came about should both interfaces be up
> and active at the same time.
Surely "hot-swapping" IP addresses between interfaces wont work very well,
since forgetting DHCP its ARP that will cause a problem.
Each previously communicating host will have a MAC address logged in its ARP
table for the offending IP address.
If the IP address changes MAC addresses, the ARP entries on all other hosts
must time-out in order to be renewed via an ARP broadcast.
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