Re: [TERNLI] Forwarding corrupt packets
Gorry Fairhurst <gorry@erg.abdn.ac.uk> Mon, 04 September 2006 13:05 UTC
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Date: Mon, 04 Sep 2006 14:05:08 +0100
From: Gorry Fairhurst <gorry@erg.abdn.ac.uk>
Organization: University of Aberdeen, UK
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To: Michael Tuexen <Michael.Tuexen@lurchi.franken.de>
Subject: Re: [TERNLI] Forwarding corrupt packets
References: <1157097623.3192.34.camel@lap10-c703.uibk.ac.at> <44F83E74.1080603@isi.edu> <1157121036.3192.148.camel@lap10-c703.uibk.ac.at> <44F84AD5.7070307@isi.edu> <1157131227.3192.220.camel@lap10-c703.uibk.ac.at> <44F8780D.9060503@isi.edu> <1157356740.3197.57.camel@lap10-c703.uibk.ac.at> <85C961BE-2B32-4A31-8235-49CCDCF1332D@lurchi.franken.de>
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Cc: ternli@ietf.org, Joe Touch <touch@ISI.EDU>
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So, I had missed this being discussed (sorry). I'm quite confused about several things: * In Section 3 it says: The SCTP endpoint can inform its peer that it has received an SCTP packet, but the CRC-32 was wrong. I presume though that the receiver can somehow verfy that the original packet has been sent with a particular IP source, and protocol. How? I'm curious also here how you know some details * How do you find the process to respond to (since ports are not protected by an IP checksum)? * How do you verify this isn't a third-party DoS attack, because presumably you can't rely on sequence numbers, ports, etc to help you? * I think I could have missed it, but what is the mechanism by which an IP packet passes through the node and receives a treatment that leaves it with a corrupted CRC-32 at the transport layer, but some (reliable) understanding of the content (IP addresses, length, protocol, etc). * If you return a message from a mid-box, how do you know that routers down-stream of the mid-box would have forwared this packet? Gorry Michael Tuexen wrote: > Dear all, > for SCTP there is an ID > http://www.ietf.org/internet-drafts/draft-stewart-sctp-pktdrprep-05.txt > which sends back a packet to the sender if the receiver detects a > transport > layer checksum failure... > > Best regards > Michael > > On Sep 4, 2006, at 9:59 AM, Michael Welzl wrote: > >>> The question is the impact of the bad packet. > <Snip> > >
- [TERNLI] Forwarding corrupt packets Michael Welzl
- Re: [TERNLI] Forwarding corrupt packets Joe Touch
- Re: [TERNLI] Forwarding corrupt packets Michael Welzl
- Re: [TERNLI] Forwarding corrupt packets Joe Touch
- Re: [TERNLI] Forwarding corrupt packets alessandro salvatori
- Re: [TERNLI] Forwarding corrupt packets Michael Welzl
- Re: [TERNLI] Forwarding corrupt packets Joe Touch
- Re: [TERNLI] Forwarding corrupt packets Michael Welzl
- Re: [TERNLI] Forwarding corrupt packets Gorry Fairhurst
- Re: [TERNLI] Forwarding corrupt packets Michael Tuexen
- Re: [TERNLI] Forwarding corrupt packets Michael Welzl
- Re: [TERNLI] Forwarding corrupt packets Gorry Fairhurst
- Re: [TERNLI] Forwarding corrupt packets Gorry Fairhurst
- Re: [TERNLI] Forwarding corrupt packets Michael Tuexen
- Re: [TERNLI] Forwarding corrupt packets Gorry Fairhurst
- Re: [TERNLI] Forwarding corrupt packets Michael Tuexen
- Re: [TERNLI] Forwarding corrupt packets Joe Touch
- Re: [TERNLI] Forwarding corrupt packets Michael Welzl
- Re: [TERNLI] Forwarding corrupt packets Michael Welzl
- Re: [TERNLI] Forwarding corrupt packets Gorry Fairhurst
- Re: [TERNLI] Forwarding corrupt packets Michael Tuexen
- Re: [TERNLI] Forwarding corrupt packets Gorry Fairhurst
- Re: [TERNLI] Forwarding corrupt packets Michael Tuexen
- Re: [TERNLI] Forwarding corrupt packets Joe Touch
- Re: [TERNLI] Forwarding corrupt packets Michael Tuexen
- Re: [TERNLI] Forwarding corrupt packets Joe Touch
- Re: [TERNLI] Forwarding corrupt packets Michael Tuexen
- Re: [TERNLI] Forwarding corrupt packets Michael Welzl
- Re: [TERNLI] Forwarding corrupt packets Randall Stewart
- Re: [TERNLI] Forwarding corrupt packets Randall Stewart
- Re: [TERNLI] Forwarding corrupt packets Gorry Fairhurst
- Re: [TERNLI] Forwarding corrupt packets Gorry Fairhurst