![]() 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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