IPv6 not working on Asus RT-N13UB1

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wsc4049
DD-WRT Novice


Joined: 19 Mar 2017
Posts: 1
PostPosted: Sun Mar 19, 2017 6:58    Post subject: IPv6 not working on Asus RT-N13UB1 Reply with quote
I changed to Comcast recently and want to use my Asus RT-N13U B1 router for IPv6.

However, dhcp6c cannot be started. I enabled syslog and run it in debug mode and got:

Code:

Jan  1 01:16:59 DD-WRT daemon.notice dhcp6c[2175]: gethwid: found an interface eth2 for DUID
Jan  1 01:16:59 DD-WRT daemon.notice dhcp6c[2175]: get_duid: generated a new DUID: 00:03:00:01:00:0c:43:xx:xx:xx
Jan  1 01:16:59 DD-WRT daemon.notice dhcp6c[2175]: get_duid: saved generated DUID to /var/dhcp6c_duid
Jan  1 01:16:59 DD-WRT daemon.err dhcp6c[2175]: client6_init: setsockopt(SO_REUSEPORT): Protocol not available


I tried two RTN13Us and the following builds:

Firmware: DD-WRT v3.0-r31571 std (03/04/17)
Firmware: DD-WRT v3.0-r29739
Firmware: DD-WRT v3.0-r28397 (12/01/15)

Same result.

Only udhcpc and dnsmasq are running:

Code:

  746 root      1060 S    dnsmasq -u root -g root --conf-file=/tmp/dnsmasq.conf --cache-size=1500
  843 root      1044 S    udhcpc -i vlan2 -p /var/run/udhcpc.pid -s /tmp/udhcpc -O routes -O msstaticroutes -O staticroutes


I have /tmp/dhcp6c.conf:
Code:

interface vlan2 {
 send ia-na 1;
 send ia-pd 1;
 send rapid-commit;
 request domain-name-servers;
 script "/sbin/dhcp6c-state";
};
id-assoc pd 1 {
 prefix ::/60 infinity;
 prefix-interface br0 {
  sla-id 0;
  sla-len 4;
  ifid 1;
 };
};
id-assoc na 1 { };


What does that error "client6_init: setsockopt(SO_REUSEPORT): Protocol not available" mean and how to fix it?

radvdump does see four /64 prefixes advising from Comcast though, but as dhcp6c is not running, none of them got bound to vlan2 or br0.
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mwchang
DD-WRT Guru


Joined: 26 Mar 2013
Posts: 1857
Location: Hung Hom, Hong Kong
PostPosted: Mon Mar 27, 2017 16:05    Post subject: Re: IPv6 not working on Asus RT-N13UB1 Reply with quote
wsc4049 wrote:
I changed to Comcast recently and want to use my Asus RT-N13U B1 router for IPv6.

However, dhcp6c cannot be started. I enabled syslog and run it in debug mode and got:
....
What does that error "client6_init: setsockopt(SO_REUSEPORT): Protocol not available" mean and how to fix it?

radvdump does see four /64 prefixes advising from Comcast though, but as dhcp6c is not running, none of them got bound to vlan2 or br0.

Telnet to the router, post the output of `ifconfig` and `netstat -anp`?
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hubermania
DD-WRT User


Joined: 24 Aug 2012
Posts: 223
PostPosted: Wed May 03, 2017 21:46    Post subject: Reply with quote
I never got the "ifid" directive to work. Simple is better. I break my /60 prefix into /64's with something like below:
Code:

id-assoc pd 1 {
    prefix ::/60 infinity;
    prefix-interface br0 {
        sla-id 0;
        sla-len 4;
    };
    prefix-interface wl0.1 {
        sla-id 1;
        sla-len 4;
    };
    prefix-interface wl1.1 {
        sla-id 2;
        sla-len 4;
    };
};

Then use dnsmasq to automatically add IPv6 address ranges for each interface's /64 subnet:
Code:

dhcp-range=::,constructor:br0,ra-names,slaac,64,12h
dhcp-range=::,constructor:wl0.1,ra-names,slaac,64,12h
dhcp-range=::,constructor:wl1.1,ra-names,slaac,64,12h

_________________
[Broadcom] Asus rt-ac66u r35531 ('66 should only be factory reset through the DD UI)
Fix RT-AC66U "wl1 [2.4 GHz TurboQAM]". DD-WRT failsafe UI @ http|https://169.254.255.1/
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