...and is likely to not perform its function if it is intended to be a 
hop-by-hop option...

On Apr 19, 2010, at 2:12 PM, Ran Atkinson wrote:

> Folks,
> 
>  As I've said before, ILNP can work with IPv4 as well as IPv6.
> Of course, the engineering varies, but the architecture is the same.
> Folks might want to examine the L32 record in draft-rja-ilnp-dns,
> for example.  
> 
>  Further, multiple ISP folk tell me that they are now 
> configuring their routers to ignore all IPv4 options (including
> the IPv4 Router Alert option) because of concerns about (D)DOS
> attacks on backbone infrastructure.  

I don't think that's especially new...

>  This new deployment approach has the effect of making all deployed 
> IPv4 options end-to-end options, rather than being hop-by-hop options.  
> It also means that if one puts an IPv4 option in an IPv4 packet, 
> it is likely to be received at the intended end node, and also is
> likely NOT to cause performance issues in IPv4 backbones.
> 
> Cheers,
> 
> Ran
> 
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http://www.ipinc.net/IPv4.GIF

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