By default, when configuring an IPv6 address, Windows 10 generates a random number to fill out the bits needed for the NIC portion of the IPv6 address. This security measure helps conceal your device’s MAC address, and further protects your privacy by generating a new number every so often. There may be times, however, when you need your system to maintain a static IPv6 address. To do this, you can disable IPv6 autoconfiguration using the netsh utility in an elevated Command Prompt window. Do the following: 1. Open an elevated Command Prompt window. 2. Enter ipconfig/all. What is your computer’s current IPv6 address and MAC address? Carefully compare the two addresses. Are they in any way numerically related? 3. To disable the random IP address generation feature, enter the command: netsh interface ipv6 set global randomizeidentifiers5disabled 4. To instruct Windows to use the EUI-64 standard instead of the default settings, use this command: netsh interface ipv6 set privacy state5disabled Figure 3-32 shows where both commands were entered and accepted. 5. Enter ipconfig /all again. What is your computer’s new IPv6 address? How closely does this number resemble the MAC address? Notice in the second half of the IPv6 address, after FE80::, that the fixed value FF FE has been inserted halfway through the MAC address values. The host portion of the IPv6 address might use a slightly different value than the OUI in the MAC address because the seventh bit of the MAC address is inverted. 6. Re-enable random IPv6 address generation with these two commands: netsh interface ipv6 set global randomizeidentifiers5enabled netsh interface ipv6 set privacy state5enabled
By default, when configuring an IPv6 address, Windows 10 generates a random number to fill
out the bits needed for the NIC portion of the IPv6 address. This security measure helps conceal
your device’s MAC address, and further protects your privacy by generating a new number
every so often. There may be times, however, when you need your system to maintain a
static IPv6 address. To do this, you can disable IPv6 autoconfiguration using the netsh utility
in an elevated Command Prompt window. Do the following:
1. Open an elevated Command Prompt window.
2. Enter ipconfig/all. What is your computer’s current IPv6 address and MAC address?
Carefully compare the two addresses. Are they in any way numerically related?
3. To disable the random IP address generation feature, enter the command:
netsh interface ipv6 set global
randomizeidentifiers5disabled
4. To instruct Windows to use the EUI-64 standard instead of the default settings, use this
command:
netsh interface ipv6 set privacy
state5disabled
Figure 3-32 shows where both commands were entered and accepted.
5. Enter ipconfig /all again. What is your computer’s new IPv6 address? How closely
does this number resemble the MAC address?
Notice in the second half of the IPv6 address, after FE80::, that the fixed value FF FE has
been inserted halfway through the MAC address values. The host portion of the IPv6
address might use a slightly different value than the OUI in the MAC address because
the seventh bit of the MAC address is inverted.
6. Re-enable random IPv6 address generation with these two commands:
netsh interface ipv6 set global
randomizeidentifiers5enabled
netsh interface ipv6 set privacy
state5enabled
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