Re: [RRG] The use of UDP in LISP

[Tony Li <tli@cisco.com>]

On Dec 16, 2007, at 6:21 AM, Iljitsch van Beijnum wrote:

> On 15 dec 2007, at 18:00, Tony Li wrote:
>
> > On Dec 14, 2007, at 2:18 PM, Iljitsch van Beijnum wrote:
>
> > > By the way: host NICs routinely handle IPv4 IP and TCP/UDP  
> > > checksumming. I suggest router vendors start adding the same  
> > > logic to their hardware, and in a somewhat more general way so  
> > > that IPv6 can also be supported, with additional headers between  
> > > the IP and TCP/UDP headers when present. This will avoid similar  
> > > issues in the future.
>
> > Done, circa 1998.
>
> Must have been while you were away from Cisco, because the IOS  
> _software_ that I tested a few years ago wasn't even smart enough  
> to filter TCP or UDP with a fragment or AH header in between.

Sorry, I should have been more clear.  Basic checksumming has been  
done.  Arbitrary, unspecified complexity doesn't fit well in most  
ASICs.  While there is a proof-of-concept that this can be done, it  
is not the norm, nor would I expect it to become the norm.  The  
market isn't enlightened enough to want it.

Tony

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