Re: Re: howto disable default multiple device activation?

[Alexander Sack <asac ubuntu com>]

On Wed, Nov 26, 2008 at 02:06:23PM +0000, netztier bluewin ch wrote:
> 
> >Do you have any reasons to hate it, 
> 
> I for instance would - although much less on a unixoid OS than on *eew* Windoze. With multiple IP interfaces, there 
> is a strong tendency for nonunicast IP packets leaving the box via the "wrong" interface - regardless of the source 
> address being written into the packet. So in general, I would see use cases for not automatically having a wired and a 
> wireless interfaces active at the same time. Some Laptop firmwares even have such a "Wifi XOR LAN" switch you can 
> activate in their BIOSs.
> 
> >The fastest device is always used for new TCP connections, so it's not like it'll slow anything down.
> 
> How does TCP know about an interface's speed? I would assume that it just passes it's segments to the IP layer - 
> which will then forward packets according to what the routing table says.

NM tweaks the routing table in such a way that traffic is going
through faster devices. So TCP doesnt know; instead NM guesses what is
a the best interface.

 - Alexander