[froggy51]

OK guys need a bit of help. I'm by no means a networking guy, and am really struggling to get IPV6 working with my router. My ISP (Andrews & Arnold) in the UK supports basically any configuration of IPV6. I elected for DHCPV6 with prefix delegation. I've installed the latest Kong build on the R9000, so I'm running Firmware: DD-WRT v3.0-r39855M std (05/25/19). Settings listed below...

ipv6 enable
DHCPV6 with prefix delegation
Prefix length = 64
Static DNS 1: 2606:4700:4700::1111 (Cloudflare)
Static DNS 2: 2606:4700:4700::1001
MTU: 1452

Everything else disabled apart from Radvd which is enabled.

I also added "ifconfig eth0 promisc" to Admin>Commands>Startup (although I understand it should no longer really be needed in this firmware version.

When I do this I can see the router is obtaining an IPV6 address in the top right corner of the DD-WRT homepage, however when I log in to ipv6-test I get a test indicating I'm NOT using ipv6! It comes out with something helpful saying your ISP supports it but... yada yada yada (score 4/10 ). Same with other ipv6 test sites....

Any help or advice on how to solve my IPV6 issue is greatly appreciated. What am I doing wrong? It's driving me nuts.

[msoengineer]

[froggy51]

[franksddwrt]

In addition to turning on “DHCPV6 with prefix delegation”, which gets an ipv6 address for the WAN interface, make sure you also enable “dhcp6s” further down the page, which turns on the dhcp6 server in dd-wrt which hands out dhcp6 IPs to your clients.

[froggy51]

[Per Yngve Berg]

turn off Radvd and dhcp6s and use DNSMasq.

In addtional dnsmasq settings:

quiet-dhcp
quiet-dhcp6
quiet-ra
enable-ra
dhcp-range=::10,::200,constructor:br0,ra-names,slaac,64,24h


With a 64 prefix length you can only get one sub-net. Are you not going to make a guest network?

[froggy51]

[Per Yngve Berg]

dhcp6c custom:

interface eth0 {
send ia-pd 0;
send rapid-commit;
script "/sbin/dhcp6c-state";
};
id-assoc pd 0 {
prefix ::/48 infinity;
prefix-interface br0 {
sla-id 0;
sla-len 16;
};
prefix-interface br1 {
sla-id 1;
sla-len 16;
};
prefix-interface eth1.3 {
sla-id 2;
sla-len 16;
};
};
id-assoc na 0 { };


Your isp may give you prefix length 48, 56 or 60

Prefix-len+sla-len=64


Did you check with "ifconfig" that your router's interfaces have an IPv6 address?

[froggy51]

OK phoned my ISP. They said that for some reason I had no /48 allocation. Anyway, this is apparently now fixed. Tried the above dhcp6c custom, still nothing.

[Per Yngve Berg]

From the command prompt (telnet or ssh)

[RobrPatty]

[BarkingSpider]

I found that under the Security Tab, Un-tick "Filter Multicast", save/apply. That allowed my ipv6 to function.

[RobrPatty]

[yodog]

Maybe try enabling the wifi security password / enable WPA2 GGCP and use the same password as your 5ghz network? I dunno about you guys but I seem to have less errors with anything internet related, including within internet games when I change it from the default disabled wifi security password for the 60ghz network, to a WPA2/GGCP or whatever it's called and I type the same password as the password I use for my 5ghz wireless AC network.


Could also be maybe you need to manually type in the gateway and stuff instead of leaving it the default 0.0.0.0 ?

Not really sure, I am out of ideas but if you ever get it solved please do post here as I am curious what the fix really was/is.

[Per Yngve Berg]