Re: [tcpm] comments on draft-ietf-tcpm-icmp-attacks-05
Fernando Gont <fernando@gont.com.ar> Mon, 15 June 2009 02:16 UTC
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Date: Sun, 14 Jun 2009 23:16:48 -0300
From: Fernando Gont <fernando@gont.com.ar>
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To: Joe Touch <touch@ISI.EDU>
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Cc: "tcpm@ietf.org" <tcpm@ietf.org>, Fernando Gont <fernando.gont@gmail.com>
Subject: Re: [tcpm] comments on draft-ietf-tcpm-icmp-attacks-05
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Joe Touch wrote: >>> 5) (general) Section 5.1, last paragraph, it >>> seems like we should be mentioning TCP-AO as >>> well here, though I don't think it changes any >>> part of the claim. >> Agreed. Maybe this is also an indication that TCP-AO *should* change >> something in this respect! > > TCP-AO already addresses ICMP attacks in the security considerations > section, and requires there to be a way to disable reaction to ICMPs. > Like IPsec, though, we don't make a-priori assessments as to whether > ICMPs should be blocked or not on connections on which TCP-AO (or IPsec) > is used. IIRC, the motivation for the TCP MD5 option was to mitigate RST-based reset attacks. Does it make any sense to have the option and still even consider reacting to ICMP error messages? Reaction to ICMP "frag needed" is probably a little more difficult to assess (for obvious reasons), but reaction to ICMP hard errors is, IMO, a no-brainer, and I believe should default to "SHOULD NOT abort connections". Kind regards, -- Fernando Gont e-mail: fernando@gont.com.ar || fgont@acm.org PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1
- [tcpm] comments on draft-ietf-tcpm-icmp-attacks-05 Eddy, Wesley M. (GRC-MS00)[Verizon]
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Eddy, Wesley M. (GRC-MS00)[Verizon]
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Eddy, Wesley M. (GRC-MS00)[Verizon]
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Fernando Gont
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Fernando Gont
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Joe Touch
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Joe Touch
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Eddy, Wesley M. (GRC-MS00)[Verizon]
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Fernando Gont
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Florian Weimer
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Florian Weimer
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Joe Touch
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Joe Touch
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Fernando Gont
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Fernando Gont
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Fernando Gont
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Joe Touch
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Joe Touch
- Re: [tcpm] comments on draft-ietf-tcpm-icmp-attac… Fernando Gont
- [tcpm] TCP-AO and ICMP attacks (was Re: comments … Fernando Gont
- Re: [tcpm] TCP-AO and ICMP attacks (was Re: comme… Joe Touch
- Re: [tcpm] TCP-AO and ICMP attacks (was Re: comme… Fernando Gont
- Re: [tcpm] TCP-AO and ICMP attacks (was Re: comme… Joe Touch
- Re: [tcpm] TCP-AO and ICMP attacks (was Re: comme… Fernando Gont
- Re: [tcpm] TCP-AO and ICMP attacks (was Re: comme… Joe Touch
- Re: [tcpm] TCP-AO and ICMP attacks (was Re: comme… Fernando Gont
- Re: [tcpm] TCP-AO and ICMP attacks (was Re: comme… Joe Touch
- Re: [tcpm] TCP-AO and ICMP attacks (was Re: comme… Fernando Gont
- Re: [tcpm] TCP-AO and ICMP attacks (was Re: comme… Joe Touch
- Re: [tcpm] TCP-AO and ICMP attacks (was Re: comme… Fernando Gont
- Re: [tcpm] TCP-AO and ICMP attacks (was Re: comme… Joe Touch