[Netkit.users] 2 real PC integration

Massimo Rimondini rimondin a dia.uniroma3.it
Ven 21 Lug 2006 21:58:34 CEST


Hi Paolo,

don't worry: the drawing is clear! :)

And, yes, you are right: only one host side tap interface per user can 
be set up by using the --ethN=tap syntax. This brings about two 
restrictions:
1) all emulated ethernet adapters connected to the external network 
("tap interfaces") must be on the same subnet;
2) all emulated ethernet adapters connected to the external network lie 
on the same collision domain.

If you look at 2), it is kind of saying that the two real PC are on the 
same hub. Hence, holding these constraints, it is a nonsense to attempt 
layer 3 routing among different tap interfaces configured this way.

Now, the question is: do you really need two real hosts to setup your 
network, or would just one (or even none) be enough, replacing the other 
with an emulated PC?
If this is not the case, and if you are interested, I can provide you 
with details about the procedure to configure other tap interfaces by 
hand. It's a little less user friendly and cannot be automated by using 
Netkit lcommands, but I can tell you if you want.

Hope this helps.

Cheers,
Massimo.

Paolo Carpo wrote:

>Hi!
>
>Thanks for the replay to the previous question. But I've another one:
>is it possible to integrate 2 real PC in the emulated topology?
>I'm able to integrate 1 pc by using --eth(?)=tap,192.168.x.x, 192.168.x,y
>But I saw that if i use that method again it doesn't create a new tap 
>interface, so I can connect another real machines only in the same subnet of 
>the previous one. Is it right?
>
>I would like to obtain something like this:
>
>
>Real PC
>192.168.1.2/24						emulate host 192.168.2.1/24
>		|								|
>		|								|
>		|								|
>	emulated router---------------------------------------emulated router
>										|
>										|
>										|
>										|
>										|
>									emulate router
>										|	
>										|
>									real host 192.168.3.1/24
>
>I hope the draw is clear!
>Thanks a lot,
>		Paolo Carpo
>  
>
>------------------------------------------------------------------------
>
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