[Click] KernelTun vs KernelTap

[Eddie Kohler]

Hi,

- Use KernelTap if you want to handle Ethernet types other than IP.
- Use KernelTun if you're just interested in IP functionality.
- Since KernelTun generates IP packets only, there is no need to respond to 
ARP queries.  In fact you will not see any ARP queries -- you will only see IP 
packets.

Eddie


Midas wrote:
> Hi,
> 
> I am a little unsure about the usage of KernelTun vs KernelTap.
> Can someone please explain when to use KernelTun and when
> to use KernelTap.
> 
>>From what I could make out from the documents, KernelTap
> deals with Ethernet packets, while KernelTun deals with IP
> packets, but it is still a little hazy and I wouldn't know when
> to use which.
> 
> Another question: How do I respond to arp queries when using
> KernelTun? For KernelTap the example says:
> 
>   tap0 :: KernelTap(192.0.0.1/8)
>        -> fromhost_cl :: Classifier(12/0806, 12/0800);
>   fromhost_cl[0] -> ARPResponder(0.0.0.0/0 1:1:1:1:1:1) -> tap0;
> 
>   fromhost_cl[1] -> ... // IP packets
> 
> 
> Is there an analogous example to handle ARP queries with
> KernelTun?
> 
> Thanks
> Midas
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