Re: [Autoconf] Autoconf addressing model
Alexandru Petrescu <alexandru.petrescu@gmail.com> Thu, 05 March 2009 15:09 UTC
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Date: Thu, 05 Mar 2009 16:09:48 +0100
From: Alexandru Petrescu <alexandru.petrescu@gmail.com>
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To: Teco Boot <teco@inf-net.nl>
References: <499F0BA7.90501@piuha.net> <49A8471E.6090506@gmail.com> <009501c99920$92154340$b63fc9c0$@nl><49A944FF.9000102@gmail.com> <003001c99b2c$a3fcf4a0$ebf6dde0$@nl><49AD5184.6080300@gmail.com> <000101c99c3c$3121a870$9364f950$@nl><49AD9760.3080909@gmail.com> <49AD98D4.3@earthlink.net><49AD9EA8.6040803@gmail.com> <49ADA17B.9040600@earthlink.net><49ADAF7C.1050509@gmail.com> <49ADB9FB.6050600@earthlink.net> <49AE3A3A.5000305@gmail.com> <7FB7EE0A621BA44B8B69E5F0A09DC76407B5D783@xmb-rtp-208.amer.cisco.com> <49AE9827.5090309@gmail.com> <7FB7EE0A621BA44B8B69E5F0A09DC76407B5D803@xmb-rtp-208.amer.cisco.com> <49AEBA6D.7030903@gmail.com> <7FB7EE0A621BA44B8B69E5F0A09DC76407B5DB1F@xmb-rtp-208.amer.cisco.com> <49AF97FA.70200! 07@gmail.com> <002201c99d76$017d4b20$0477e160$@nl> <49AFAA15.9! 060905@gmail.com> <003a01c99d8e$f47ba2f0$dd72e8d0$@nl> <49AFD85E.50403! 01@gmail.com> <004a01c99d9b$542e1e10$fc8a5a30$@nl> <49AFDE93.60! 904@gmail.com> <004b01c99da1$dc4ab9b0$94e02d10$@nl>
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Cc: autoconf@ietf.org
Subject: Re: [Autoconf] Autoconf addressing model
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Teco Boot a écrit : > Hi Alex, > > |> The 54 bits following 1111111011 are zero. There is little difference > |> between FE80::/10 and FE80::/64. On Ethernet, it is the latter. > | > |Which one should we picture on the AUTOCONF practical addressing scheme? > | The /10 or the /64? > > It depends. > With Ethernet (and related 802 addressing), it is /64. > For other interfaces, there is more freedom. But there is RFC4291: > For all unicast addresses, except those that start with the binary > value 000, Interface IDs are required to be 64 bits long and to be > constructed in Modified EUI-64 format. I agree. > |In a picture like that I'd definitely put an address and the prefix like > |this, in the simplest case: > | > |---\ > | \ fe80::1/128 (the address) > | --------- > | / 2001:db8::/64 (the prefix of the subnet on which this interface > |---/ attached) > | > > Why? > Please read RFC4291 section 2.3 (Address Prefixes) > > This "fe80::1/128" is an invalid address prefix. > Address fe80::1 is OK, Address prefixes fe80::1/64 and 2001:db8::1/64 are > also OK. Ah ok! I'd normally picture what are the parameters I need to set up the network you illustrated on linux. So would this be ok:? /------\ / \ fe80::1 (the address) | Router |-------------- \ / 2001:db8::/64 (the prefix of the subnet on which \------/ this interface is attached) For me, whereas the 2001:db8::/64 information is enough to add in radvd.conf, or to add with ifconfig, the problem is that I can't just say "ifconfig eth0 add fe80::1" and I must say "ifconfig eth0 add fe80::1/10", otherwise error. > |> |> I repeated the test with the link local addresses. Here also, I > |> |> experienced no problems. This is because there are two links with > |> |> exactly the same address pairs (an advantage to use same LL > |addresses > |> |> on all interfaces). > |> | > |> |Demonstrating the advantage of loopback0 vs eth0 would have implied > |that > |> |you start OSPFv3 on eth0 instead of loopback0 and that it would have > |> |crashed. > |> > |> My routing protocols do not crash. I told you before. > | > |Sorry, I don't remember. So then they could work without loopback0 > |interface, only over the Ethernet interface, right? (they wouldn't crash > |when the interface goes down and then up). > | > |> |But even then, I'm sure there may exist OSPFv3 implementation which > |> |would not crash when running over eth0 and ifconfig down eth0. > |> | > |> |In this sense, if the loopback0 interface is a solution to crashing > |> |OSPFv3-over-eth0, then it is an implementation solution. Some > |> |implementations do, others don't. > |> > |> You totally missed the point. > | > |Your point seemed to motivate the use of loopback0 interface. And so, > |because presumably the physical interfaces are not enough. Am I > |catching your point? > > You are free using loopback interfaces or not. > I explain why I have an advantage. This is not crashing protocols, it is > eliminating unneeded terminated sessions. > > I do not accept a comment that I have no advantage. I have also different > scenarios, some have benefits from a loopback interface, some have not. I am > waiting on an answer from you, on your standpoint to be interoperable with > me or not. I hope your routing protocol doesn't crash when receiving a host > prefix. If so, I do not want to be compatible with you. Well my answer is that as of now I don't use any routing protocol, and only put manual prefixes in the routing tables. Alex
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- Re: [Autoconf] new charter Alexandru Petrescu
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- Re: [Autoconf] new charter Alexandru Petrescu
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- Re: [Autoconf] new charter Carlos Jesús Bernardos Cano
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- Re: [Autoconf] Autoconf addressing model Alexandru Petrescu
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- Re: [Autoconf] Autoconf addressing model Alexandru Petrescu
- Re: [Autoconf] Autoconf addressing model Teco Boot
- Re: [Autoconf] Autoconf addressing model Alexandru Petrescu
- Re: [Autoconf] Autoconf addressing model Charles E. Perkins
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- Re: [Autoconf] Autoconf addressing model Teco Boot
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- Re: [Autoconf] Autoconf addressing model Teco Boot
- Re: [Autoconf] Autoconf addressing model Alexandru Petrescu
- Re: [Autoconf] Autoconf addressing model Dearlove, Christopher (UK)
- Re: [Autoconf] Autoconf addressing model Dearlove, Christopher (UK)
- Re: [Autoconf] Autoconf addressing model Teco Boot
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- Re: [Autoconf] Autoconf addressing model Alexandru Petrescu
- Re: [Autoconf] Autoconf addressing model Alexandru Petrescu
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