Also you acknowledge that you have read and understand our Privacy Policy. Try "option ipv6 auto", this should automatically spawn a virtual DHCPv6-PD interface. A number of ddwrt users , myself included prefer dnsmasq over radvd. (for example, dhcpv4/6) Moreover the only hit is from bogon_6 which doesn't contain the prefix of my provider or any link local addresses. A typical default configuration consists of one dhcp6c section with common settings and one or more interface sections, usually covering the lan and loopback networks. The documentation for IPv6 doesn't mention wan_6 dynamically created interfaces. When the Openwrt router gets assigned a only single /64, there is nothing to delegate further for its own LAN side. I think the option mtu statement sets the MTU for physical interface All defined options of this section are listed below. When you send any egress traffic, the firewall is tracking the connection and allows the reply in. I may have a fiddle at some stage. With tcpdump I can see solicit from OpenWrt and advertise from server. So, say your isp gave you this for your prefix def: 2001:db8:face:dad0::/60, your first subnet you can give to an interface is 2001:db8:face:dad0::/64, then 2001:db8:face:dad1::/64, then 2001:db8:face:dad2::/64, etc. I removed the wan6 interface but wan_6 is behaving the same as wan6 was: Looks like no address is being allocated. Is this correct. The Freebox is a popular Internet router delivered by French ISP Free to its customers. Filter IPv6 incoming traffic. The hint is hex from 0-F. Did the engineer mention which version of openwrt he was using? I only configured the pppoe on wan and wan6 was almost ready from factory config. I have the same issue. Setting it to auto will spawn a virtual interface wan_6 (note the underscore) which takes care of the prefix assignment. When you send any egress traffic, the firewall is tracking the connection and allows the reply in. My normal router is RSPro on 18.06.4, but since I tried too many variations I thought I test on a Carambola2 also 18.06.4 with clean install. However OpenWrt should reply with a request, instead it sends again solicit, server sends advertise and this continues indefinitely. DHCPv6-PD should work by default on OpenWrt. a 'trusted' VLAN for workstations, an 'IOT' VLAN and a 'guest' VLAN. Sections of type interface define on which interfaces delegated prefixes are added and how they're aggregated. (non-bridged) interfaces in case no delegated prefixes are available. The RG receives a /60 PD to a dhcpv6 IA-PD request it makes on its WAN interface from the broadband gateway router in the ISP network. But when there are no hits for your isp prefixes or link locals, banip can also be ruled out. There is also no 'tcpdump' on this build so I can't inspect the raw network traffic. It will work both for uplinks supporting DHCPv6 with Prefix Delegation and those that don't support DHCPv6-PD or DHCPv6 at all (SLAAC-only). 11 comments. IPv6 with Hurricane Electric using LuCI. This topic was automatically closed 10 days after the last reply. They use ipv6 'auto' and then do the configuration on the wan6 interface. It will try to acquire ipv6 for itself and a prefix for the lan. That is what my ISP told me as well, they had trouble with autoconfiguration too. And with what have you bridged the eth1.2 ? Are sure 60 will work? Did you disable/modify the default dhcpv6 firewall rule? I installed tcpdump and captured the output when restarting the wan6 interfaces (ifdown wan6; ifup wan6): Found the problem. I just configured the wan and default input to ACCEPT. Hi, Maybe OpenWRT will fallback to a different prefix length but I'm also not sure about this one. (if the default input policy is set to drop/reject) The valid options of this section are listed blow. In wan zone input is dropped/rejected, so you do need specific allow rules for the DHCPv4/v6, ICMPv6 and other flows. They offer /56 which is visible in the packet capture, but it doesn't even install that one under ifstatus wan6, let alone adding it under lan interface. Very clear and simple test. 14941 root 1028 S odhcp6c -s /lib/netifd/dhcpv6.script -Ntry -P0 -t120 pppoe-wan. So there must have been something blocking the DHCPv6 packets in the firewall due to the bridge interface? the ppp daemon gets launched with mtu 1492, ISP: AT&T Fiber in U.S.A ISP Provided Gateway: Pace 5268ac Router: Netgear R7800 running OpenWrt 22.03-SNAPSHOT r19235-d0965dc174 / LuCI openwrt-22.03 branch git-22.083.69105-af8e91c I tried setting up a macvlan interface to request separate IPv6 /64 Prefix from the AT&T Pace 5268ac Gateway. If yes, maybe there is a problem with the firewall and the firewall rules are not correctly applied at boot. This time I could see solicit, advertise, request and reply. Any idea how to troubleshoot further? When you search for odhcp6c in the luci process overview (or 'ps | grep odhcp6c' in terminal), what parameters/flags are applied to it? DHCPv6 was blocked at the wan zone. report. I guess, when the firewall is started, otherwise, it would make no sense. Had IPv6 working great with DD-WRT on this device using DHCPv6 w/Prefix Delegation, prefix length /64, Radvd enabled. This requires a solicitation (UDP src 546 to dst 547) and a response (UDP src 547 to dst 546). Are sure 60 will work? "auto" is default Maybe try a number value instead of "auto". I'll need to discuss it with them tomorrow as well. Hello all, I recently managed to get IPv6 from my ISP, so I could drop HE tunnel. With this release the OpenWrt project brings all supported targets back to a single common kernel version and further refines and broadens existing device support. Here is what I see on the WAN interface that relates to ICMPv6/DHCPv6: But first explain why the wan interfaces are bridged and we'll get to the dhcp6. The DHCP client can then configure an IPv6 address on its LAN interface using the prefix it received. CC Attribution-Share Alike 4.0 International, Specifies whether the DHCPv6 client should be started on boot, Enables additional debug information in the system log, Requests prefix delegation at the DHCPv6 server, Requests a permanent, non temporary address at the DHCPv6 server, Signalize a rapid commit two message exchange (, Request Network Information Service (NIS) server address (, Request Network Information Service (NIS) domain name (, Request Network Information Service V2 (NIS+) server address (, Request Network Information Service V2 (NIS+) domain name (, Request Broadcast and Multicast Control Service (BCMCS) address (, Request Broadcast and Multicast Control Service (BCMCS) domain name (. I believe this can rule out the firewall from the list. New replies are no longer allowed. Weird, cause the IPv4 worked for years with this setting, and it is something I automatically configure in pppoe interfaces. However when I run 'ifstatus wan' I see the IPv6 address associated to the wan interface and nothing appears on wan6. Does this also apply to dhcpv6 traffic? Like I said, I never clicked on those options on initial setup that I can recall (I had to search pretty deeply to find them in order to disable them). Firewall gets started (default policy set to DROP, network is not up/configured yet). I've tried this but get no output: odhcp6c -v br-wan6 -P 0 -N force, There is also no 'tcpdump' on this build so I can't inspect the raw network traffic. Behavior remains the same, Solicit and Advertise only. NAT66 and IPv6 masquerading. opkg update opkg upgrade odhcpd-ipv6only Pico July 27, 2021, 7:17am #14 on your downstream router, there is the "Request IPv6 prefix length" setting on the WAN interface on the "General Settings" tab. They use ipv6 'auto' and then do the configuration on the wan6 interface. The key is to set dhcpv6-pd prefix-only so we only request an prefix via dhcpv6 and get our ipv6-address for eth0 via slaac WORKING CONFIG TO REQUEST AN /62 via IPv6-PD on Edgerouter-X on v1.10 Thanks, I have added the firewall rules shown above as those seemed to be the crucial part which was missing for a dynamic DHCPv6 PPP-based connection. Is there a valid reason to bridge the wan interface? Multiple configurations exist but for my ISP using a fiber connection with an IPv4 PPPoE connection encapsulating DHCPv6 advertisement/solicitation this was required. Do you have banip, bcp38 or similar packages installed? Yes, change 1 to auto - they have different meanings. I have made it work, with a few workarounds. How to use OpenWrt behind a Freebox Crystal with IPv6 bridge, How to use OpenWrt behind a Freebox with IPv6 delegation, CC Attribution-Share Alike 4.0 International. In which configuration stanza? What I was trying to say was when are the (wan) zone rules are applied? Abstract. If you want to contribute to the OpenWrt wiki, please post HERE in the forum or ask on IRC for access. I think tcpdump 'sees' traffic before iptables, at least for inbound traffic. Or create a new interface wan_6 section and use the same options/settings as wan6 does? Also make sure that your lan interface has option ip6assign 64 (or a larger prefix size) set to actually redistribute the received prefix downstream. I'm assuming I've done something dumb. Sections A typical default configuration consists of one dhcp6c section with common settings and one or more interface sections, usually covering the lan and loopback networks. I am under the same impression, that tcpdump will capture traffic on the wire. Maybe there is a problem with netifd/ubus (or something else) where the reporting/handling of prefix delegation is bugged. When the zone rules are only get applied when an interface in that zone comes up then odhcp6c can never receive the advertise message. I have PPPoE as well. Content may be missing or not representing the latest edited version. Maybe it is a problem with the latest version. This website uses cookies. Not sure if this was some defense measure from the ISP. Basic Properties Maybe it broke something that went unnoticed. Sometimes delegation doesn't work, then it starts working again. So if try to ping google.com, it doesn't pick up the IPv4 DNS. Had to re-enable the "br-lan" interface and combine eth0.1, wlan0, and wlan1 so that DHCP would work again. Been fighting this for a while now. WAN zone has default INPUT policy of DROP. The /etc/config/dhcp6c file controls the WIDE-DHCPv6 client package wide-dhcpv6-client configuration. I wonder why the wiki page recommends this setup? I can manually insert a prefix and that gets delegated but the automatic Prefix Delegation that should 'just work' isn't working. I'd say it was even worse, as I noticed that with 'reqaddress force' I don't even get an address on the wan. IPv6 multicast. You may also want to look at using dnsmasq for your RAs / dhcpv6 oprions etc instead of radvd + dhcp6s. Or do you have to set option ipv6 '1' instead of 'auto' in the interface wan section? I'm also not sure how to configure the auto spawned wan_6 interface. MTU = 1500 is the proper value here if you want a 'pppoe mtu of 1492' The OpenWrt community is proud to announce the first release candidate of the upcoming OpenWrt 19.07 stable version series. Path of script which is executed when a reply is received, Specifies whether a prefix should be added on this interface. You are absolutely right, that is what was happening. save. In May 2018, the OpenWrt forum suffered a total data loss.
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