The MPLS WG Archive

[Erblichs <erblichs@earthlink.net>]

George Swallow,

	Firewalls (intermediate systems) seem to be showing
	up alot to hide IP address for a number of
	reasons, thus...

	The third item was added due to some firewall
	(intermediate systems) work that I have seen 
	which seems to effect MPLS hop by hop routing.

	If I understand the interactions correctly Explicit
	MPLS source routing would not be effected.
	
	However, I thought separating the two would be
	a bit wordy..

	Mitchell Erblich
	-------------------
	

George Swallow wrote:
> 
> Hi -
> 
> Thanks for the comments:
> 
> >       Thus a simple change vs the longer one here, is
> >       to specify the "mis-ordering of flow between" to
> >       re-ordering of individual flows.
> 
> point taken.
> 
> >       2) ECMP can only occur when multiple paths exist,
> >       thus I would suggest "splitting aggregated flows" to
> >       splitting aggregated flows where multiple paths
> >       exist.
> 
> A nit, but I can add it.
> 
> >
> >       One should also be aware that some intermediate
> >       systems are intercepting flows between a source and
> >       destination and then modifing source
> >       addresses for security purposes. These modifications
> >       may alter the effectiveness of of removing ECMP
> >       routing behaviour. Of course, on the return to the
> >       modified source address, if the return flow is not
> >       modified, the flow is then re-directed back to the
> >       original source.
> 
> This one is a bit off topic and I think it could add more confusion than
> light.  I'm not planning on adding it.
> 
> ...George
> 
> ========================================================================
> George Swallow             Cisco Systems                  (978) 936-1398
>                            1414 Massachusetts Avenue
>                            Boxborough, MA 01719

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