Hi,

After updating my 2762 to the latest firmware (9.9_BT) my router appears to be handing out incorrect subnets. Specifically it's handing out subnets that are the same as the router's WAN IP.

From my ISP's portal:Route: 2A02:390:zzzz::/48Prefix: 2A02:390:FEED:zzzz::/64

'zzzz' is the same number, hidden for security. On the And the router is handing out LAN addresses that start with 2A02:390:FEED.

Something seems to be wrong here. This seems to be why my mail server is no longer visible to IPv6 hosts on the LAN or the WAN presumably because its address 2A02:390:zzzz:1:... is no longer valid.

Can I fix this by manually specifying an IP address range for the DHCP server? If so how do I specify the range - I could enter 2A02:390:zzzz:1:: as the start but what would I enter as the end value?

Update: I've just received this explanation from another site:

That's an address from the WAN side which can only happen if the Draytek configuration has bridged the WAN interface to one or more ports on the LAN side.

Can anyone tell me where that would be done in the UI and therefore how I might undo it?

Thanks.

Replying to me own post. I thought I'd got a resolution by disabling Auto IPv6 and forcing it to use the ::1 subnet but after a week or so it broke again.

I've now reverted to 6.6BT and everything is back to normal. There is no mention of the FEED subnet and on the configuration pages and the router is handing out address on the ::1 subnet as I'd expect it to.

I hope this bug is specific to this router but I suspect it's in common code used across the Vigor range.