I also tried a quick new guest and it has the same problem. It turns out that host and guest cannot ping each other at all. Sometime (maybe a few months ago?) it stopped working. win10 exports a mount over smb and the linux mounts it and this gives me a shared partition. Host and guest can access everything they should, except they cannot access/ping each other. This is expected behavior.I have a win10 host with a debian jessie guest and bridged networking. Note that the value of this registry parameter doesn’t affect the IPv6 checkbox in the properties of the network adapter. Other possible values for the DisabledComponents parameter:ĭisable IPv6 on all nontunnel interfaces (except the loopback) and on IPv6 tunnel interface To return to Windows default behavior (prefer IPv6 over IPv4), run the command: reg add hklm\system\currentcontrolset\services\tcpip6\parameters /v DisabledComponents /t REG_DWORD /d 0x0 Microsoft recommends using this policy instead of disabling IPv6 on the host. You can use Group Policy Preferences to deploy this registry key to multiple computers in an Active Directory domain using a GPO.Īfter that, IPv6 Functionality will change to “Prefer IPv4 over IPv6” policies. Reboot your computer for the changes to take effect. This value allows you to prefer an IPv4 protocol over IPv6 by changing entries in the prefix policy table. Or you can change the value of the DisabledComponents to 0x20 via the Regedit.exe GUI. Open the elevated command prompt and run the command: reg.exe add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters /v DisabledComponents /t REG_DWORD /d 0x20 /f The IPv6 functionality can be configured in Windows by modifying the DisabledComponents registry parameter HKLM\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters. The “Adapters and Bindings” dialog box is missing in the newest Windows 10/11and Windows Server 2016/2019.Īnother way to change the default TCP/IP stack from IPv6 to IPv4 on these OSs is through the registry. You should perform this operation for all available bindings. Select your network connection, and set the IPv4 protocol above IPv6 with the green button. To do it, open Control Panel > Network and Internet > Network Connections > Advanced > Advanced Settings. You can also change the preferred IP protocol from GUI. In order to make this change permanent, you can change or create the DisabledComponents registry parameter with a value 0x20, which will tell Windows to always prefer IPv4 over IPv6 (see below). Print the current prefix priority table: netsh interface ipv6 show prefixpoliciesĪs you can see, IPv4 is now used by default when sending the network packets. Now we’ll check that the server is still pinging by its IPv6 address, and we didn’t break anything: The remote server began to return an IPv4 address (192.168.10.21) instead of an IPv6 address. Reply from 192.168.10.21: bytes=32 time<1ms TTL=128Īs you can see, the result changed dramatically in the direction we needed. By default, this change is made persistent across reboots.įor example, run these two commands on a clean Windows Server 2016 host, and run a ping request again: Pinging with 32 bytes of data These commands increased the priority of the IPv4 prefix policy and decreased the priority for IPv6. Netsh interface ipv6 set prefix ::ffff:0:0/96 55 4 You need to open an elevated Command Prompt, and run 2 commands: netsh interface ipv6 set prefix ::/96 60 3 The solution doesn’t require a reboot, it takes effect immediately. By default, the ::ffff:0:0/96 prefix has a lower priority than ::0 which means IPv6 is preferred over IPv4 on this Windows host. A protocol with a higher Precedence value in this table has a higher priority. In this table, the policy “ 1 ::/0” (Native IPv6) takes precedence over “ ::ffff:0:0/96” (IPv4). Windows uses this prefix table to determine which address to use, then multiple addresses are available for the hostname (IPv4 and IPv6 in this case). It determines which IP addresses are preferred when establishing a remote connection. The prefix policy table is similar to the routing table.
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