I currently have DHCPv6 working perfectly like this on my openwrt router, but when trying to test on Windows Server 2012 R2 or Windows Server 2016, it seems I can only create DHCPv6 scopes with a /64 prefix delegation. The Freebox is a popular Internet router delivered by French ISP Free to its customers. Yes it is enabled and I have tried to loosen it up without any result. 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. I ended up using "option ipv6 1" with a static wan6 interface. By the way, I tried that adjusted to my case, but no joy. This is usually a user error. hide. However when I run 'ifstatus wan' I see the IPv6 address associated to the wan interface and nothing appears on wan6. Behavior remains the same, Solicit and Advertise only. Namely: But still if someone has any idea, I am all ears. It defines basic properties and interface settings. I have expanded it with some of the information above. If not, what is blocking it? It also provides initial support for the new ath79 target, the. And then configure all the settings in the interface wan6 section. Seems your issue is not with the configuration then, maybe an incompatibility between odhcp6c and your ISP? However OpenWrt should reply with a request, instead it sends again solicit, server sends advertise and this continues indefinitely. For an uplink with native IPv6-connectivity you can use the following example configuration. I wonder why the wiki page recommends this setup? Hi, Now all is well. (/lib/netifd/dhcpv6.script). If yes, do you use the same version? Or create a new interface wan_6 section and use the same options/settings as wan6 does? Using the basic algorithm: PD Address Space / Number of LAN Ports = block size per port. I just tried with a recently flashed Carambola2 on 18.06.5 that I keep spare. (by default there should be one) For prefix delegation to work downstream, there should be several /64 prefixes available (at least two, so that the Openwrt router would keep one for itself and its WAN side (=modem side) and assign the other for its LAN). Are sure 60 will work? My ISPs DHCPv6 is a bit broken so most of my testing is with a static IPv6 on the wan. So this is why input rules for the wan zones are needed. //edit The question is, does odhcp6c actually receive the dhcpv6 advertise message. Except where otherwise noted, content on this wiki is licensed under the following license:CC Attribution-Share Alike 4.0 International. Default rules apply to interfaces that are not assigned to any zone. The WAN (br-wan) and WAN6 (br-wan6) interfaces are set up out of the box by default, primarily to allow DHCP and DHCPv6, respectively. WAN zone has default INPUT policy of DROP. After looking https://wiki.openwrt.org/doc/uci/network6#downstream_configuration_for_lan-interfaces I tried to make couple changes to my /etc/config/network file to look like this I think the option mtu statement sets the MTU for physical interface 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. However, machines inside the network are only setting up link-local IPv6 addresses, so the SLAAC doesn't seem to be doing its thing. I only configured the pppoe on wan and wan6 was almost ready from factory config. DHCPv6-PD should work by default on OpenWrt. Do the settings from wan6 also apply to wan_6? This rule is not needed, you are not running a dhcp6 server on the wan interface, are you? MX Series,M320,M120. 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 have a Linksys router running OpenWRT 18.06.5, and am getting an IP address and a prefix delegation from my ISP (Comcast). I can ask him next time we talk, it got already midnight here. Maybe you have to edit a script to enable it. You can use DHCPv6 prefix delegation to automate the delegation of IPv6 prefixes to the CPE. Setting it to auto will spawn a virtual interface wan_6 (note the underscore) which takes care of the prefix assignment. But how can an MTU issue break delegation and not everything else also? The prefix delegation occurs between a provider edge (PE) device and customer premises equipment (CPE) using the DHCPv6 prefix delegation option. Had to re-enable the "br-lan" interface and combine eth0.1, wlan0, and wlan1 so that DHCP would work again. I did not set anything up myself in this regard. The section of type dhcp6c named basic defines common client settings. Maybe I missed some update. 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. and launches the ppp daemon with the mtu specified. Been fighting this for a while now. Remember to redact passwords, MAC addresses and any public IP addresses you may have, Powered by Discourse, best viewed with JavaScript enabled, IPv6 trouble with DHCPv6 Prefix Delegation, https://openwrt.org/docs/guide-user/network/ipv6/start. Maybe OpenWRT will fallback to a different prefix length but I'm also not sure about this one. Lo and behold, IPv6 now obtains an IP! Perhaps it is an interface name thing - your "ipv6 option auto"==wan_6 compared to my "ipv6 option 1" == wan6. The DHCP client can then configure an IPv6 address on its LAN interface using the prefix it received. I have a support ticket with my ISP open already. PPPOE for the IPv4 wan, SLAAC on IPv6 wan, and DHCPv6 for prefix delegation. In May 2018, the OpenWrt forum suffered a total data loss. Had IPv6 working great with DD-WRT on this device using DHCPv6 w/Prefix Delegation, prefix length /64, Radvd enabled. This website uses cookies. I need some more packet tracing practice and learn better with real problems. save. The original post can be found on the forum . Override the DUID used for DHCPv6 requests. The following firewall rules allow this to work: I reworked the option ipv6 section of the wiki a few days ago. https://openwrt.org/docs/guide-user/network/wan/isp-configurations. Had IPv6 working great with DD-WRT on this device using DHCPv6 w/Prefix Delegation, prefix length /64, Radvd enabled. Any ideas what is happening? I removed the wan6 interface but wan_6 is behaving the same as wan6 was: Looks like no address is being allocated. Is there any way to get some live debug output to see what might be going on? Abstract. Are there different means of allocating ipv6 addresses besides DHCPv6? That is what my ISP told me as well, they had trouble with autoconfiguration too. Normally it will be shown under "IPv6 WAN Status" in the "Network" section like. If you do not agree leave the website. It incorporates over 3700 commits since branching the previous OpenWrt 18.06 release and has been under development for about one a half years. This example requests a /56 sized prefix and DNS servers on wan and configures two /64 subnets out of the prefix on lan and loopback. Multiple configurations exist but for my ISP using a fiber connection with an IPv4 PPPoE connection encapsulating DHCPv6 advertisement/solicitation this was required. The valid options of this section are listed blow. When you send any egress traffic, the firewall is tracking the connection and allows the reply in. Sometimes delegation doesn't work, then it starts working again. Content may be missing or not representing the latest edited version. With tcpdump I can see solicit from OpenWrt and advertise from server. The problem seems to be with DHCPv6. The /etc/config/dhcp6c file controls the WIDE-DHCPv6 client package wide-dhcpv6-client configuration. I've got a PPPoE connection, with native IPv6. Thanks for the tip on adding 'tcpdump'. I noticed that in the config snipet that my ISP sent me there was no mtu=1492 in the wan interface. but because of the 8byte overhead of pppoe the actual mtu will be 1484. "auto" is default Maybe try a number value instead of "auto". 1 will enable IPCP6 negotiation but nothing else, you'll need to manually configure a DHCPv6 interface then. I did not set anything up myself in this regard. I installed tcpdump and captured the output when restarting the wan6 interfaces (ifdown wan6; ifup wan6): Found the problem. I have the same issue. That applies to ingress traffic. It tries to follow the RFC 6204. requirements for IPv6 home routers. His testing router (tp-link, not OpenWrt) successfully concluded the DHCPv6 sequence, while mine is stuck in the first 2 steps. Does this also apply to dhcpv6 traffic? 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. The /etc/config/dhcp6c file controls the WIDE-DHCPv6 client package wide-dhcpv6-client configuration. I had tried them both options, with auto (wan_6) and manual (wan6). Do you see anything of interest in logread after ifdown wan; ifup wan ? I can ping 8.8.8.8 from hosts. I deleted the option and now everything is correct, eth0 1500 and pppoe-wan 1492. With tcpdump I can see solicit from OpenWrt and advertise from server. The engineer from my ISP asked me how's the troubleshooting going and he showed me his test raspberry running OpenWrt and connecting properly with almost defaults. I also removed both the "546-to-547" and "547-to-546" supplemental firewall rules mentioned in the OpenWrt IPv6 article and things still work fine. Not sure if this was some defense measure from the ISP. 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. My ISP basically told me the same. So you already tried the following config and it didn't work? I'd say it was even worse, as I noticed that with 'reqaddress force' I don't even get an address on the wan. The setup should be quite simple. Is there anyway to change that to hand out the correct prefix based on the vlans I have? report. And with what have you bridged the eth1.2 ? But I'm not sure about this. I just configured the wan and default input to ACCEPT. Using LEDE 17.0.1.4. So I rebooted the device. Is the routing an issue for wan6 or with the wan_6 interface you get with ''option ipv6 auto''? In wan zone input is dropped/rejected, so you do need specific allow rules for the DHCPv4/v6, ICMPv6, and other flows. Does it work now? This time I could see solicit, advertise, request and reply. I don't see any dhcp6 solicit to start with. If you want to contribute to the OpenWrt wiki, please post HERE in the forum or ask on IRC for access. What prefix length does your isp provide? The DHCP address on the PPPoE tunnel appears on wan instead of wan6 and nothing else happens, there isn't even a IPv6 route created. Make sure you have a big terminal window then it's a simple expression to filter the output to leave DHCPv6 over PPPoE. Try "option ipv6 auto", this should automatically spawn a virtual DHCPv6-PD interface. I have banip, but it is auto-adding the link local IP of my ISP in the white list. It defines basic properties and interface settings . OpenWrt 19.07.0 first release candidate Installing and Using OpenWrt I don't need non-default firewall rules using option ipv6 1 on wan and option proto dhcpv6 on wan6. On the OPNsense WAN interface it has a static IPv4 and does DHCPv6 with prefix delegation. Temporarily, i.e for about a minute, I can see in ifstatus that wan6 has the PD, but valid timer is less than a minute and soon is vanished. I'll need to discuss it with them tomorrow as well. Filter IPv6 incoming traffic. wan is not bridged by default, nor is it needed to allow dhcp. Hi! So if try to ping google.com, it doesn't pick up the IPv4 DNS. (non-bridged) interfaces in case no delegated prefixes are available. It will try to acquire ipv6 for itself and a prefix for the lan. However, I think I was getting DHCPv6 responses with ''option ipv6 1'' and ''option proto dhcpv6'' on wan6. 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. Do you have banip, bcp38 or similar packages installed? They suggest the fixed wan interface with a reqaddress: force setting but nothing much else. wan/wan6 sends dhcp request but can't receive the response because the wan/wan6 zone input allow rules are not yet applied. 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). The documentation for IPv6 doesn't mention wan_6 dynamically created interfaces. 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 eth0 MTU was 1492 and pppoe-wan 1484. If yes, maybe there is a problem with the firewall and the firewall rules are not correctly applied at boot. Very clear and simple test. The DUID must be specified as a set of at least 7 colon separated heximal digits, e.g. The hint is hex from 0-F. Well, I had a packet capture which shows blocked ports beforehand and DHCPv6 enabled over PPPoE afterwards, after enabling those two rules. Default rules apply to interfaces that are not assigned to any zone. However I am getting the following odhcp6c error: daemon.err odhcp6c[21313]: Failed to send RS (Address . The odhcp6c command line looks fine to me. NAT66 and IPv6 masquerading. Here is what I see on the WAN interface that relates to ICMPv6/DHCPv6: That is not correct. LinkSys WRT32X with latest OpenWrt 19.07.5 r11257, Spectrum cable Internet. The loopback interface gets the first subnet assigned, lan the second. leave your radvd with default config. Also you acknowledge that you have read and understand our Privacy Policy. In wan zone input is dropped/rejected, so you do need specific allow rules for the DHCPv4/v6, ICMPv6 and other flows. Not sure if this was some defense measure from the ISP, //edit I suggest to do a reset of the device to defaults and start from scratch. Moreover the only hit is from bogon_6 which doesn't contain the prefix of my provider or any link local addresses. I guess, when the firewall is started, otherwise, it would make no sense. 14941 root 1028 S odhcp6c -s /lib/netifd/dhcpv6.script -Ntry -P0 -t120 pppoe-wan. Just like the LAN(br-lan) interface which is in the "lan" firewall zone. I tried to remove it too and it worked! Sorry that I overlooked this. I have configured wan and wan6 as interfaces in banip. Maybe it is a problem with the latest version. That applies to ingress traffic. Even though the tcpdump log shows the dhcpv6 response from the server, I think tcpdump 'sees' traffic before iptables, at least for inbound traffic. proftDecember 25, 2020, 8:52pm #1 LinkSys WRT32X with latest OpenWrt 19.07.5 r11257, Spectrum cable Internet. 11 comments. Self-registration in the wiki has been disabled. Also you acknowledge that you have read and understand our Privacy Policy. Maybe it broke something that went unnoticed. Does delegation work when you restart the wan6 interface? Topic: How to Configure DHCPv6 client with prefix delegation on a :: /64 link And it was my wrong to use it without checking first documentation or the "ip link". I'm not sure. (for example, dhcpv4/6) 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. IPv6 extras. I understand there are default wan6 firewall rules. odhcpd provides server services for DHCP, RA, stateless SLAAC and stateful DHCPv6, prefix delegation and can be used to relay RA, DHCPv6 and NDP between . Are you using PPPoE or do you have a plain Ethernet hand-off? A number of ddwrt users , myself included prefer dnsmasq over radvd. Any idea how to troubleshoot further? 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. Did you disable/modify the default dhcpv6 firewall rule? Maybe OpenWRT will fallback to a different prefix length but I'm also not sure about this one. Did you set option ip6assign on your lan interface? Weird, cause the IPv4 worked for years with this setting, and it is something I automatically configure in pppoe interfaces. I've tried about every combination. This sections are named, the section name corresponds to the covered logical interface. Then they will end up with wan6 and wan_6, which I don't think is a good idea. Setting it to auto will spawn a virtual interface wan_6 (note the underscore) which takes care of the prefix assignment. By default, all INPUT traffic is allowed (for every zone and can individually be overwritten per zone) In the ISP router I've enabled the 'exposed host' feature so its firewall is transparent. I may have a fiddle at some stage. I have connected my travel router to my mother-in-law's . This HOWTO explains how to configure OpenWrt to: Enable IPv6 on the Freebox. [Edit: Thanks for the tip on adding 'tcpdump'; I've added capture output below]. Regardless of that the pppoe interface still has the mtu set. For v4 as well, the reply is not coming from the same address it was sent to. (-Ntry ?). 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. 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. No, he didn't mention the version, however I guess that he used the latest. Wish I knew why DHCPv6 was blocked as well, I found one other person who mentioned this so I'm wondering if it's the way an ISP deploys DHCPv6? prefix ::/56 infinity; So the first thing I would do is use a custom dhcp6c config using the above example. Powered by Discourse, best viewed with JavaScript enabled, Dhcpv6 client doesn't complete negotiation, no delegated prefix, Wireguard interface disappears when wan goes down, [Solved] DHCPv6 issue, no Prefix Delegation, https://openwrt.org/docs/guide-user/network/wan/isp-configurations. This website uses cookies. It tries to follow the RFC 6204 requirements for IPv6 home routers. Is this correct. I already have "option ipv6 '1'" in the wan interface inside /etc/config/network. Strange, banip doesn't whitelist any upstream ipv6 addresses. odhcpd is a daemon for serving and relaying IP management protocols to configure clients and downstream routers. Obtain IPv6 public network delegation in OpenWrt. Basic Properties IPv6 DHCPv6 Prefix Delegation Configuration ISP Customer Routers C1 C2 Hosts Verification ISP Customers C1 C2 The prefix delegation feature lets a DHCP server assign prefixes chosen from a global pool to DHCP clients. Except where otherwise noted, content on this wiki is licensed under the following license:CC Attribution-Share Alike 4.0 International. 3. But those rules are applied only when the wan/wan6 interface is up. I was anyway using the defaults for the firewall, so if it didn't work for me it wouldn't work for anyone else. It uses the first /64 from this /60 for the directly connected LAN network (wired and Wi-Fi). 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. Extensions to DHCPv6 also enable prefix delegation, through which an ISP can automate the process of assigning prefixes to a customer for use within the customer's network. IPv6 with Hurricane Electric. By using the website, you agree with storing cookies on your computer. I think tcpdump 'sees' traffic before iptables, at least for inbound traffic. Most home routers have 4 LAN ports, so that a /56 will be divided into /60s to be allocated to the first tier of routers (Router A, Router B, Router C). Did you enable/modify the default dhcpv6 firewall rule? IPv6 with Hurricane Electric using LuCI. 1 will enable IPCP6 negotiation but nothing else, you'll need to manually configure a DHCPv6 interface then. Something like "pppoes and ipv6" on the interface carrying the PPPoE connection, mine was eth0.2, Powered by Discourse, best viewed with JavaScript enabled, PPPoE - IPv6 addressing and prefix delegation not working as docs indicate - SOLVED (firewall rules for DHCPv6). Here are config snippets that may be helpful: Thanks for the tip on adding 'tcpdump'. I will have a play once I am allowed to fiddle with the router. I believe this can rule out the firewall from the list. Or do you have to set option ipv6 '1' instead of 'auto' in the interface wan section? New replies are no longer allowed. And remove the route6 config section. "option ipv6 1" under wan, so to configure wan6 manually. But when there are no hits for your isp prefixes or link locals, banip can also be ruled out. 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