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Hi

On Windows 10 the command which is supposed to disable autoconfiguration does not work

netsh interface ipv6 set interface "Local Area Connection" routerdiscovery=disabled

there is additional option which is supposed to take effect immediately or permanently and they do not work.

There is no reason for the Network Prefix to be included in the Router Advertisement when in router or managed mode.

As a result of the Router Advertisements ICMPv6 Option 134 including the Network Prefix is in Managed Mode this is causing Windows 10 clients which have been configured with Static IPv6 Addresses to generate SLAAC addresses.
Windows Auto Address configuration is enabled is enabled by default, and despite searching with Google I have not found a way to disable IPv6 auto address configuration when using static IPv6 addresses.

Configuring Router Advertisements to "Managed" I know does not disable Router Advertisements but the Router Advertisement should not include ICMP Option (Prefix Information) as this includes Valid Lifetime and Preferred Lifetime settings and is used by clients to generate SLAAC addresses.

ICMP Option (Prefix Information) should only be included when Router Advertisements are configured "Unmanaged", "Assisted" and "Stateless" when SLAAC is being used.

Further to the packet capture, expanding the ICMPv6 Option (Prefix information) it includes a Valid Lifetime and Preferred Lifetime information which is being used to get the DHCPv6 clients to generate a SLAAC address using the information.

When the Router Advertisements are set to Managed, SLAAC is disabled and the ICMPv6 Option (Prefix Information) should be advertised. The DHCPv6 Server should handle the allocation of IPv6 Addresses.

Hi,

I have my Opnsense 23.1.5_4 configured for IPv6 Router Advertisements as Managed, as I have separate pair of Kea Servers handling IPv6. I noticed that a Windows 10 PC was using SLAAC to automatically generate its own IP address.

When I performed a packet capture I found that the SLAAC Router Advertisements were coming from the Opnsense which I specifically had disabled by configuring as Managed.

I presume this is a bug.

I have updated to include the packet capture despite the Router Flags set to Managed and the Opnsense dhcp server being disabled it includes the Network Prefix to cause clients to generate their own SLAAC address

Hi,

Would it be possible for the System Packet information after selecting an interface, the packet graphs would split IPv4 so it displays IPv4 vertically above the line and IPv6 below the line to the same scale. So visually it is easy to compare IPv4 and IPv6 traffic volume.