Re: a question about tunnels

[Kurt Erik Lindqvist <kurtis@kurtis.pp.se>]

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On 2004-02-05, at 19.18, marcelo bagnulo wrote:

> Suppose that you have a host A with a single IP address IPA
> The host receives a IP in IP encapsulated packet
> The inner IP header contains destiantion address IPA and source 
> address IPB
> The outer IP header contains destiantion address IPA and source 
> address IPC
> The Host A has no configured tunnel With IPC
>
> What does the host does with this packet?
>
> I would expect that the packet is discarded. This IMHO would be the
> behaviour coherent with the proposed processing of the HoA option of 
> MIPv6.
>
> However, in RFC 2003 (security considerations), it is stated that:
>
> Host implementations that are capable of receiving encapsulated IP
> datagrams SHOULD admit only those datagrams fitting into one or more
> of the following categories:
>
> [...]
>     -  The encapsulated (inner) datagram is addressed to a network
>        interface belonging to the decapsulator
>
> So, RFC 2003 recomends that nodes should accept these packets...
>
> Is this correct?
> I mean, if this is so, the transport layer survivability problem could 
> be
> easier, i guess
>

I am guessing, but my guess is that the host accepts the packet but 
what happens then is up to the ULP in question.

- - kurtis -

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