Posted: Sun Jul 22, 2018 4:03 Post subject: Disabling IPv6 SLAAC
I am running build 36330 and was wondering if there is some way to block IPv6 SLAAC route advertisements. I already have IPv6 disabled in the Setup / IPv6 tab. I use my ddwrt as a wireless access point. My Comcast gateway is sending out periodic IPv6 route advertisements and it causes my phone to get an IPv6 address and DNS servers when connected via wifi
I have no issue with IPv6 and would actually run it on my local network, but the Comcast business class service does not allow me to disable SLAAC and I always end up with their DNS servers.
You'd probably get a better answer in the Advanced Networking forum, but as long as you're here...
I don't think DD-WRT can have any effect on RA until it's setup as an IPv6 router. Try enabling IPv6 in DD-WRT with "DHCPv6 with Prefix Delegation" and see if you can get a /64 prefix from the upstream Comcast gateway. If so, DD-WRT can serve DHCPv6 addresses from that prefix using DNSmasq and whatever addressing mode you want.
LAN-side clients would use whatever DNS servers you put on the IPv6 tab, as long as the Comcast gateway doesn't force DNS requests onto their own servers. _________________ [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/
DNS is exactly the problem. They are forcing me to use their DNS servers through the SLAAC advertisements. I don't want to use their DNS. I want to use mine. I have nothing against IPv6 and would love to get it running on my network, but I don't want to be force fed their IPv6 DNS servers.
