Re: Flow label versus Extension header - protocol itself

[Greg Daley <greg.daley@eng.monash.edu.au>]

Hi Iljitsch,

Iljitsch van Beijnum wrote:
[chop]
> > => they are not end-to-end?
>
>
> In most cases they will be. (It should be possible to implement the  
> shim in middleboxes.) However, the reachability detection and  
> negotiation packets will generally not carry higher-layer data so  then 
> there would be a destination option as sole payload, or we'd  have to 
> use another protocol (UDP?) to implement parts of the shim,  creating 
> the opportunity for some shim packets to pass filters and  some to be 
> blocked, which is a headache.

Please, Please let's not go there!

I don't think changing packets by insertion of headers unbeknownst
to the host is a good idea.

Even with the knowledge of the edge device, it's better not to have
these modifications by the network.

I didn't even think Routing Headers (Type 0 or IPv4) were a good idea.

A clever hack, but not a good idea.

Lets leave the source routing to the end devices and MPLS!

Greg