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Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop

"Templin, Fred L" <Fred.L.Templin@boeing.com> Mon, 22 October 2012 17:46 UTC

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From: "Templin, Fred L" <Fred.L.Templin@boeing.com>
To: joel jaeggli <joelja@bogus.com>, Tom Taylor <tom.taylor.stds@gmail.com>
Date: Mon, 22 Oct 2012 10:46:16 -0700
Thread-Topic: [v6ops] new draft: draft-taylor-v6ops-fragdrop
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Cc: "v6ops@ietf.org" <v6ops@ietf.org>
Subject: Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop
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Hi Joel,

> -----Original Message-----
> From: v6ops-bounces@ietf.org [mailto:v6ops-bounces@ietf.org] On Behalf Of
> joel jaeggli
> Sent: Monday, October 22, 2012 9:43 AM
> To: Tom Taylor
> Cc: v6ops@ietf.org
> Subject: Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop
> 
> On 10/19/12 11:56 AM, Tom Taylor wrote:
> > On 19/10/2012 2:11 PM, Templin, Fred L wrote:
> >>> other than causing bandwidth / pps DoS attacks, or alternatively
> >>> tickling
> >>> obscure ipv6 stack bugs, no.  At least in theory.
> >>
> >> There's no excuse for broken IPv6 stacks that can't handle
> >> fragmentation and reassembly. About DoS concerns, if the
> >> network is going to intentionally break frag/reass out of
> >> concern for edge devices that might not be able to handle
> >> the load, then that is very bad for applications that cannot
> >> reduce the size of packets they send down to 1280. Again,
> >> tunnels fall into that category.
> >>
> >> So, if tunnels cannot rely on ICMP PTB and also cannot rely
> >> on IPv6 frag/reass then there is only one option remaining:
> >> https://datatracker.ietf.org/doc/draft-templin-intarea-seal/
> 
> They can implement fragmentation in their upper layer encapsulation
> rather than using the ip fragmentation header and two or more fragmented
> ip datagrams in addition to seal, SSL/TLS-vpn's and SSTP have to do the
> same thing...

Do you know whether the DoS considerations discussed in this thread
apply also for SSL/TLS and SSTP when there is fragmentation in the
upper layers?

Thanks - Fred
fred.l.templin@boeing.com

> > which, as a matter of fact, came up briefly in the Interim Meeting
> > discussion.
> > _______________________________________________
> > v6ops mailing list
> > v6ops@ietf.org
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> >
> 
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