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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