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Re: [v6tc] Issue 1: Could we live with UDP encapsulation always o n?

Ole Troan <ot@cisco.com> Wed, 22 December 2004 15:36 UTC

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To: Pekka Savola <pekkas@netcore.fi>
Subject: Re: [v6tc] Issue 1: Could we live with UDP encapsulation always o n?
References: <C26BB8276599A44B85D52F9CE41035E1050B9904@esealnt944.al.sw.ericsson.se> <Pine.LNX.4.61.0412221656550.30824@netcore.fi>
From: Ole Troan <ot@cisco.com>
Date: Wed, 22 Dec 2004 15:23:13 +0000
In-Reply-To: <Pine.LNX.4.61.0412221656550.30824@netcore.fi> (Pekka Savola's message of "Wed, 22 Dec 2004 17:00:02 +0200 (EET)")
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>> In routers (here tunnel servers) the next header value often
>> determines whether the packet is sent to the control plane for higher layer processing.
>> With UDP encapsulation either
>> an additional UDP filtering step must be implemented in the forwarding
>> plane or the packets will be sent
>> to slow path processing. Neither of these alternatives are really
>> promising (either they result in bad performance or in excessive development costs).
>
> I'm not sure if I understand what you're saying.
>
> Whether or not the router should process the packet depends on the
> destination address or if it has router alert hop-by-hop option.
>
> Or are you referring to router implementations which perform
> IPv6-in-IPv4 in hardware (without control plane), but could not do the
> same to IPv6-in-IPv4[UDP] ?

I don't see the implementation problem here either. the packets are
already channelled off on a branch since those packets are for the
router itself. I don't see a big difference in doing IPv6/UDP over
IPv4 versus e.g IPv6/GRE over IPv4.

/ot

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