Public bug reported:
Binary package hint: network-manager
A bug is probably not the right place to post this, and there was some
kind of design/wish document around somewhere about this but I can't
find it at the moment.
Anyway, the idea is to use the bonding module to bond the wired and
wireless interfaces on a laptop together so that when the laptop is
plugged into the (i.e. faster) wired interface it uses that and when
it's unplugged but associated (including WPA if applicable) to a WAP, it
uses wireless.
And all of this happens under a single common mac address with no
interface up/down happening in the transition -- so the rest of the
network is completely ignorant to this redundancy.
The key is the linux bonding module. But having this work with network-
manger is desirable as that's the interface that Ubuntu users use and is
flexible with regard to associating to WAPs and such.
The biggest job, creating the UI in nm-applet and the associated
NetworkManager daemon to create bonded interfaces needs to be done. But
also, the daemon has to understand slave interfaces and know not to try
to provision an IP network on them.
Find attached a patch that does the latter. When this patch (for Hardy)
is applied, a bond0 interface configured in /etc/network/interfaces such
as:
auto bond0
iface bond0 inet dhcp
slaves eth2 eth0
bond_primary eth0
bond_mode 1
bond_miimon 100
bond_updelay 200
bond_downelay 200
will allow nm-applet to associate to a WAP and configure security, but
prevents the daemon from configuring any IP information on it. The IP
configuration is applied to the bond0 interface by the regular old
Ubuntu/Debian networking.
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
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bond (i.e. wired and wireless) interfaces together for redundancy
https://bugs.launchpad.net/bugs/328665
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