Re: [tcpm] comments on draft-ietf-tcpm-icmp-attacks-05
Fernando Gont <fernando@gont.com.ar> Mon, 15 June 2009 02:28 UTC
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Date: Sun, 14 Jun 2009 23:28:26 -0300
From: Fernando Gont <fernando@gont.com.ar>
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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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Florian Weimer wrote: >>> For instance, I'm not certain that setting the DF bit is only >>> possible for hosts that support PMTUD ... is there a reference for >>> that? >> What's the reason for setting the DF flag for IP packets carrying TCP >> segments if you don't implement PMTUD? > > You don't have to put randomness into the IP ID field (at least in > theory; in practice, DF=1 packets get fragmented, too). Yes, in theory. For instance, IIRC Linux used to zero the IP ID field when DF was set, but then backed-out this change. Thanks, -- 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