DHCPV6 Event Log -Event 1006

[SpeedTrip]

Since changing my DNS on my EE Smart Hub Plus (installed March 2025) I have seen this following entry when my WIN7 system Starts up   ..

Router Advertisement settings have been changed on the network adapter 10. The current M - Managed Address Configuration flag is false and the O - Other Stateful Configuration flag is false. .....  User Action: If you are seeing this event frequently, then it could be due to frequent change in M and O flag settings on the router in the network

There are usually 3 or more entries - some show 'flag is True'

Prior to changing DNS address I was getting 'Time Service' & DNS failures & sometimes a website like NatWest just wouldnt open - eventually stating "You may have a Browser Error' - these have stopped since setting DNS to 8.8.8.8 , but nowI see this situation  ?

Can you advise if its a problem at all - WIN7 runs fine all day, accessing a variety of sites ..

[chafos]

When you say "changing my DNS on EE hub" what did you change? Maybe show the GUI screenshots

[bobpullen]

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@SpeedTrip wrote:

... WIN7 runs fine all day, accessing a variety of sites ..

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I think you've probably answered your own question 😉

The EE hub does not use DHCPv6, it uses stateless address allocation. Googling what those flags refer to suggests they are DHCPv6 related, so one could understand why they might be set to false.

No idea why a configuration change to the hub's v4 DHCP settings would have introduced these messages, but it's worth considering that Windows 7 is > half a decade past its sell-by date these days! Might not be entirely unexpected for it to have its foibles 🤷

Personally, I wouldn't worry about it - especially if it's only seen at startup.

[SpeedTrip]

Thanks for the answers !



Incidentally there were two flavours of Event - sometimes Flag=False &
sometimes = True



Looking at values displayed for the Hub, V6 is referenced extensively ....
anyway I updated my Network Controller settings to disable IPV6 & rebooted
both WIN7 & the Router - & the Event Message has gone !



Appreciate the advice !



Kind Regards, LD

[chafos]

The EE Smart Hub Plus does use DHCPv6. The hub sends Router Advertisements with M and O bits (and others) set. This tells the client to use DHCPv6 if it can. I think the GUI is incorrect - clients will use SLAAC if they don't honour the bits in RA, but most devices do support DHCPv6 and thus will use it.
I wonder if setting different DHCPv4 config somehow affects how IPv6 behaves... i mean it shouldn't... 

[chafos]

@SpeedTrip Win7 does fully support DHCPv6, specifically it 

The errors you are seeing would seem to indicate that either hub's router advertisements are changing the state of the O (other) and M (managed) bits, which would be odd. These bits tell clients how to behave, e.g. M = true indicates that DHCPv6 is available to be (and according to RFCs should be) used. O = true indicates that other information, e.g. DNS, is available via DHCP if the client wants it. I dont think that these bits changing will adversely affect the Win7 client, its just the logging is saying "this is a bit weird, didn't expect this" - does the PC IPv6 address change rapidly too?

The alternative is you have another router advertising RAs on your network - typically (in a home network) there will be one IPv6 router, advertising itself as the IPv6 route out of the network, and providing IPv6 clients with the info they need for DNS, addresses etc. Is it possible you have another router on your net?

[Ewan15]

Hi Bob

Interestingly if I run IPconfig I see the following:

NB Router is configured to use Quad9 for DNS

[bobpullen]

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@chafos wrote:

The EE Smart Hub Plus does use DHCPv6. The hub sends Router Advertisements with M and O bits (and others) set. This tells the client to use DHCPv6 if it can. I think the GUI is incorrect - clients will use SLAAC if they don't honour the bits in RA, but most devices do support DHCPv6 and thus will use it.

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I'll be the first to admit that IPv6 isn't my forté so I may stand corrected. Does this mean that we would expect both bits/flags to be 'true' then?

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The alternative is you have another router advertising RAs on your network

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Didn't think of this possibility, but it's a good one!

[SpeedTrip]

Thanks for insightful response !

No, no other Router - I just have this old FX4100 PC running WIN7  - I do have another PC linked in weekly for use as Backups repository for personal data like Pcs, OUTLOOK.psts: it runs WIN10 - but nothing else ...

I have a new Mobile phone which connects wirelessly to the EE Smart Hub Plus

[Denzel99]

As there seems to be a bit of confusion here, perhaps I can clarify things:

If both the M and O bits are false, the PC is to use the router advertisement for the network prefix (address) and auto-generate its own host address with SLAAC. It is to take any other information it needs from the router advertisement.  Principally, this is the address of the DNS it is to use.

If the M bit is set to true, the O bit setting is ignored, and the PC is to take its address and any other information from the router's DHCPv6.  (Stateful DHCP.  Basically, the same as it would do for the old IPv4 process).

If the M bit is false and the O bit is true, the PC is to use Stateless DHCP.  That is, it uses the network prefix from the router advertisement and generates a host address from SLAAC, but it then takes any other information it needs from the router’s DHCP rather than from the router advertisement.

I’m not sure why you are seeing it jump back and forth like this.  The cynical side of me says it is another example of the ISP’s current reluctance to let you use your own DNS.  It’s more likely that it is failing to validate the DNS you’ve set and then dropping back to defaults, however.