One IP used on more than one interface (gif0 and lo0)

[Justin Walker]

On Tuesday, March 9, 2004, at 10:10 AM, Julian Elischer wrote:

>
>
> On Tue, 9 Mar 2004, Justin Walker wrote:
>
>>
>> On Tuesday, March 9, 2004, at 01:55 AM, Frrodo Baggins wrote:
>>
>>> Hi,
>>>
>>>    What happens if we configure an alias on lo0:
>>>
>>>       	ifconfig lo0 alias 192.168.5.1 netmask 255.255.255.0
>>>
>>> and then use the same IP on gif0:
>>
>> What happens if you have the same address on two different houses on
>> the same street?
>
>
> that isn't the question..
> it's
> "why have different numbers on houses on differnt streets?"
>
> It is in fact common practice to number all your P2P links using teh
> address of one of your broadcast interfaces..
>
> this works well, saves you an address and you have a simpler routing
> table.
>
> Point to point links route using the REMOTE address and don't care 
> about
> teh local address so this always works.

Thanks for pointing this out; I got caught in the "all the world's an 
ethernet" trap, and overdid it.

Cheers,

Justin

--
Justin C. Walker, Curmudgeon-At-Large  *
Institute for General Semantics        | It's not whether you win or 
lose...
                                        |  It's whether *I* win or lose.
*--------------------------------------*-------------------------------*