Re: RFC4941bis: consequences of many addresses for the network

[Gyan Mishra <[e-mail]>]

On Fri, Jan 24, 2020 at 8:30 PM Brian E Carpenter <
[e-mail]> wrote:

> On 25-Jan-20 12:06, Gyan Mishra wrote:
> >
> > Microsoft link - forgot
> >
> > On Fri, Jan 24, 2020 at 6:05 PM Gyan Mishra <[e-mail]
> <mailto:[e-mail]>> wrote:
> >
> >
> >
> >     On Fri, Jan 24, 2020 at 5:11 PM Brian E Carpenter <
> [e-mail] <mailto:[e-mail]>> wrote:
> >
> >         >  I agree RFC 7217 stable address is most preferred however
> Microsoft and Apple don’t support yet.
> >
> >
> >       Gyan>On my IPv6 roadmap list with Microsoft.  So far no ETA.
> >
> >
> >         I have no idea for Apple, but afaik MS switched to pseudorandom
> stable IIDs per interface a long time ago, before Windows 7 possibly. I
> haven't seen a modified EUI-64 address on my laptop for a very long time.
> This is not the same thing as RFC7217 from a privacy point of view, but for
> network operations and neighbour cache size it seems like the same thing.
> >
> >
> >        Gyan> I think it’s EUI-64 and not modified.
>
> No. Here's what my Windows 10 says right now (WAN prefix etc obscured
> manually). There are no EUI-64 or modified EUI-64 interface identifiers.
>
> Microsoft Windows [Version 10.0.17763.737]
> (c) 2018 Microsoft Corporation. All rights reserved.
>
> C:\WINDOWS\system32>ipconfig /all
>
> Windows IP Configuration
>
>    Host Name . . . . . . . . . . . . : DESKTOP-xxxx
>    Primary Dns Suffix  . . . . . . . :
>    Node Type . . . . . . . . . . . . : Hybrid
>    IP Routing Enabled. . . . . . . . : No
>    WINS Proxy Enabled. . . . . . . . : No
>    DNS Suffix Search List. . . . . . : fritz.box
>
> Ethernet adapter Ethernet 4:
>
>    Connection-specific DNS Suffix  . : fritz.box
>    Description . . . . . . . . . . . : ASIX AX88772B USB2.0 to Fast
> Ethernet Adapter #2
>    Physical Address. . . . . . . . . : E8-03-9A-3C-67-7A
>    DHCP Enabled. . . . . . . . . . . : Yes
>    Autoconfiguration Enabled . . . . : Yes
>    IPv6 Address. . . . . . . . . . . :
> 2406:e002:xxxx:xxxx:80b2:5c79:2266:e431(Preferred)
>    IPv6 Address. . . . . . . . . . . :
> fd63:45eb:dc14:0:80b2:5c79:2266:e431(Preferred)
>    Temporary IPv6 Address. . . . . . :
> 2406:e002:xxxx:xxxx:89fa:eda3:4d87:293b(Preferred)
>    Temporary IPv6 Address. . . . . . :
> fd63:45eb:dc14:0:89fa:eda3:4d87:293b(Preferred)
>    Link-local IPv6 Address . . . . . :
> fe80::80b2:5c79:2266:e431%7(Preferred)
>    IPv4 Address. . . . . . . . . . . : 192.168.178.30(Preferred)
>    Subnet Mask . . . . . . . . . . . : 255.255.255.0
>    Lease Obtained. . . . . . . . . . : Saturday, 25 January, 2020 14:14:02
>    Lease Expires . . . . . . . . . . : Tuesday, 4 February, 2020 14:14:02
>    Default Gateway . . . . . . . . . : fe80::be05:43ff:fe8e:ce39%7
>                                        192.168.178.1
>    DHCP Server . . . . . . . . . . . : 192.168.178.1
>    DHCPv6 IAID . . . . . . . . . . . : 604000438
>    DHCPv6 Client DUID. . . . . . . . :
> 00-01-00-01-24-04-A7-BC-9C-DA-3E-8F-05-7F
>    DNS Servers . . . . . . . . . . . : fd63:45eb:dc14:0:be05:43ff:fe8e:ce39
>                                        192.168.178.1
>                                        fd63:45eb:dc14:0:be05:43ff:fe8e:ce39
>    NetBIOS over Tcpip. . . . . . . . : Enabled
>
> Wireless LAN adapter Wi-Fi:
>
>    Connection-specific DNS Suffix  . : fritz.box
>    Description . . . . . . . . . . . : Intel(R) Dual Band Wireless-AC 7265
>    Physical Address. . . . . . . . . : 1A-BC-EF-15-F2-27
>    DHCP Enabled. . . . . . . . . . . : Yes
>    Autoconfiguration Enabled . . . . : Yes
>    IPv6 Address. . . . . . . . . . . :
> 2406:e002:xxxx:xxxx:db7:d041:a2d:ce65(Preferred)
>    IPv6 Address. . . . . . . . . . . :
> fd63:45eb:dc14:0:db7:d041:a2d:ce65(Preferred)
>    Temporary IPv6 Address. . . . . . :
> 2406:e002:xxxx:xxxx:6029:b755:ced7:343e(Preferred)
>    Temporary IPv6 Address. . . . . . :
> fd63:45eb:dc14:0:6029:b755:ced7:343e(Preferred)
>    Link-local IPv6 Address . . . . . :
> fe80::db7:d041:a2d:ce65%23(Preferred)
>    IPv4 Address. . . . . . . . . . . : 192.168.178.25(Preferred)
>    Subnet Mask . . . . . . . . . . . : 255.255.255.0
>    Lease Obtained. . . . . . . . . . : Saturday, 25 January, 2020 14:13:40
>    Lease Expires . . . . . . . . . . : Tuesday, 4 February, 2020 14:13:38
>    Default Gateway . . . . . . . . . : fe80::be05:43ff:fe8e:ce39%23
>                                        192.168.178.1
>    DHCP Server . . . . . . . . . . . : 192.168.178.1
>    DHCPv6 IAID . . . . . . . . . . . : 194828862
>    DHCPv6 Client DUID. . . . . . . . :
> 00-01-00-01-24-04-A7-BC-9C-DA-3E-8F-05-7F
>    DNS Servers . . . . . . . . . . . : fd63:45eb:dc14:0:be05:43ff:fe8e:ce39
>                                        192.168.178.1
>                                        fd63:45eb:dc14:0:be05:43ff:fe8e:ce39
>    NetBIOS over Tcpip. . . . . . . . : Enabled
>
> >
> >     I found this link from Microsoft but it does not state if modified
> is supported or not.
> >
> >
> >
> http://download.microsoft.com/download/F/D/F/FDF4CF55-5FDE-4CFF-8539-3662BB5EB7A0/TD13Basel2-43.pptx
>
> IPv6 has always used "modified EUI-64". What that 2013 presentation does
> state is very clear:
>
> "Beginning with Windows Vista and Windows Server 2008, a randomized method
> is utilized to determine the Interface ID instead of EUI-64" (slide 26).
>
> In the next line it gives you the magic to revert to modified EUI-64:
>
> "netsh int ipv6 set global randomizeidentifiers=enabled|disabled"
>

  Good catch Brian!!

>
> Regards
>     Brian
>
> >
> >         Anyway, I hope we're all agreed that this topic, however
> interesting is not worth more than a small comment in RFC4941bis. Isn't it
> actually a v6ops topic ("Operational impact of numerous addresses per
> host")?
> >
> >
> >       Gyan> Agreed
> >
> >
> >
> >         Regards
> >            Brian
> >
> >     --
> >
> >     Gyan  Mishra
> >
> >     Network Engineering & Technology
> >
> >     Verizon
> >
> >     Silver Spring, MD 20904
> >
> >     Phone: [phone]
> >
> >     Email: [e-mail] <mailto:[e-mail]>
> >
> >
> >
> > --
> >
> > Gyan  Mishra
> >
> > Network Engineering & Technology
> >
> > Verizon
> >
> > Silver Spring, MD 20904
> >
> > Phone: [phone]
> >
> > Email: [e-mail] <mailto:[e-mail]>
> >
> >
> >
>
> --

Gyan  Mishra

Network Engineering & Technology

Verizon

Silver Spring, MD 20904

Phone: [phone]

Email: [e-mail]