systems:ipv6
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systems:ipv6 [2018/01/13 06:58] – [DAD Duplicate Address Discovery] superwizard | systems:ipv6 [2018/06/28 20:19] – [DUID Conflict between two Computers How to reset DUID] superwizard | ||
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+ | ====== IPV6 Ranges ====== | ||
+ | |||
+ | From: https:// | ||
+ | |||
+ | Facts about numbers | ||
+ | |||
+ | Also: https:// | ||
+ | |||
+ | |||
+ | < | ||
+ | 2000::/3 | ||
+ | To 3fff: | ||
+ | 2**125 = 42535295865117307932921825928971026432 Hosts | ||
+ | </ | ||
+ | |||
+ | ====== DUID Conflict between two Computers How to reset DUID ====== | ||
+ | |||
+ | From: https:// | ||
+ | |||
+ | duplicate ip | ||
+ | |||
+ | < | ||
+ | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\TCPIP6\Parameters | ||
+ | Dhcpv6DUID=hex: | ||
+ | |||
+ | reg delete HKLM\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters /v Dhcpv6DUID | ||
+ | |||
+ | </ | ||
+ | |||
+ | ====== Disabling RFC 4941 IPv6 Privacy Extensions in Windows ====== | ||
+ | |||
+ | From: https:// | ||
+ | |||
+ | < | ||
+ | RFC 4941 defines a series of Privacy Extensions for Stateless Address Autoconfiguration | ||
+ | in IPv6 | ||
+ | |||
+ | By default, Windows Vista, Windows 7 and Windows Server 2008 generate random interface IDs | ||
+ | for non-temporary autoconfigured IPv6 addresses, including public and link-local addresses, | ||
+ | rather than using EUI-64 derived interface IDs.1 While these are permanent, so don’t change, | ||
+ | this leads to potential confusion when a host’s expected EUI-64 derived address is unreachable! | ||
+ | |||
+ | Thankfully it’s trivial to disable this behaviour, fire up cmd.exe and issue the following. | ||
+ | |||
+ | netsh interface ipv6 set global randomizeidentifiers=disabled store=active | ||
+ | netsh interface ipv6 set global randomizeidentifiers=disabled store=persistent | ||
+ | |||
+ | In addition to this, the RFC states that the use of temporary addresses should be disabled | ||
+ | by default. | ||
+ | |||
+ | The use of temporary addresses may cause unexpected difficulties with some applications. | ||
+ | [snip] Consequently, | ||
+ | to minimize potential disruptions. Individual applications, | ||
+ | about the normal duration of connections, | ||
+ | Windows Vista and Windows 7 ignore the advice of the RFC and also configure temporary global | ||
+ | or unique local addresses as per RFC 4941 (EDIT: OS X also does this since 10.7, so do many | ||
+ | Linux distros). This behaviour is disabled by default on Windows Server 2008. | ||
+ | |||
+ | To disable privacy extensions entirely, fire up cmd.exe and issue the following. | ||
+ | |||
+ | netsh interface ipv6 set privacy state=disabled store=active | ||
+ | netsh interface ipv6 set privacy state=disabled store=persistent | ||
+ | |||
+ | The changes will take immediate effect without needing to reboot, they’ll also persist | ||
+ | after a reboot. | ||
+ | |||
+ | </ | ||
+ | |||
====== Multicast Address Space Registry ====== | ====== Multicast Address Space Registry ====== | ||
Line 392: | Line 460: | ||
From: https:// | From: https:// | ||
+ | |||
+ | |||
+ | {{ https:// | ||
< | < |
systems/ipv6.txt · Last modified: 2020/07/25 19:01 by superwizard