[Click] dynamic IP-in-IP encapsulation

[Eddie Kohler]

Hi Yi,

I've just checked in an update to IPEncap that allows you to set its DST 
argument to the string "DST_ANNO".  In this case, the element will set 
the destination address to the destination address annotation's current 
value.

As a bonus, IPEncap should be a bit faster now since it precalculates 
most of the checksum.

Thanks for your patience,
Eddie


Yi Wang wrote:
> Hello,
> 
> Is there an efficient way to do dynamic IP-in-IP encapsulation in Click, 
> e.g., after a packet passes through a IPRouteTable, encapsulate it with 
> the new destination address set to the dst address in the annotation.
> 
> It seems to me that the IPEncap only does static encapsulation. Does it 
> mean that I need to do some hack to do dynamic IP-in-IP encapsulation? 
> One such way may be to add a new IP header to packets before they enter 
> the IPRouteTable, and rewrite the outer destination address using the 
> annotation after the lookup. But I was wondering if there is better way 
> to do this.
> 
> Thanks a lot in advance.
> 
> Yi
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