Re: [dhcwg] Re: DHCP behind NAT
Bernard Dugas <bernard.dugas@is-production.com> Sat, 01 September 2001 12:07 UTC
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Date: Sat, 01 Sep 2001 13:57:07 +0200
From: Bernard Dugas <bernard.dugas@is-production.com>
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To: Ted Lemon <mellon@nominum.com>
Cc: dhcwg@ietf.org
Subject: Re: [dhcwg] Re: DHCP behind NAT
References: <200108311654.f7VGslj00311@grosse.bisbee.fugue.com>
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Hello, Ted Lemon a écrit : > I agree with you, by the way, that your proposed way of doing this is > better than the way that RFC2131 does it. The problem is not that > you're wrong, but that you're too late - this behavior was > canonicalized in RFC951, and that's the last time it was possible to > fix this the way you propose. :'} It's the 1st time that somebody tells me I've been born too late, normally this is the opposite ;-) Note that answering the ip source address is exactly the same that answering the giaddr in a normal routed network, as the relay is the ip source. So the proposed patch is not changing any behaviour in a normal routed network, it's just changing behaviour in NAT context. > I would recommend that you investigate the > subnet selection option. Send the address to which you want the > reply sent in giaddr, and use the subnet-selection-option to store the > address you would otherwise have stored in giaddr. So I have to tell that to Cisco, so they change the way their NAT handle DHCP relayed packet : only their NAT knows what is the right address to answer to. > There's no way to make your proposed change RFC2131 at this late date. > Too many devices have been deployed that follow the current protocol > specification. So ISC DHCPD will be the only available with a patch for NAT context, and I will be the only ISP with a NAT service for its customers ;-) More seriously, what is the point of a Request For Comment if valid comments can't be included ? Actually, I had no time to learn the normal process of IETF, so I may have missed some points in the process. I should spend some time on that. Did you see the patch at : http://www.is-pronet.com/download/dhcp-3.0rc11_NAT_patch.tar.gz By the way, the ip source address is now in the lease struct, but not the udp source port : a complete patch should certainly add it. Thanks a lot for your answer, and for your work with this powerful ISC DHCP server. -- __________ Bernard DUGAS ________________________________________ | | | Technoparc Pays de Gex mailto:bernard.dugas@is-production.com | | 30 Rue Auguste Piccard Tel.: +33 450 205 105 | | FR 01630 St Genis Pouilly Fax : +33 450 205 106 | |_________________________________________________________________| _______________________________________________ dhcwg mailing list dhcwg@ietf.org http://www1.ietf.org/mailman/listinfo/dhcwg
- [dhcwg] Re: DHCP behind NAT Bernard Dugas
- Re: [dhcwg] Re: DHCP behind NAT Ted Lemon
- Re: [dhcwg] Re: DHCP behind NAT Bernard Dugas
- Re: [dhcwg] Re: DHCP behind NAT Ted Lemon