openwrt dhcpv6 prefix delegation

I am under the same impression, that tcpdump will capture traffic on the wire. 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. Does delegation work when you restart the wan6 interface? Running LEDE 17.01.4 on a WR2543N. The DUID must be specified as a set of at least 7 colon separated heximal digits, e.g. I followed various advice given in https://openwrt.org/docs/guide-user/network/ipv6/start and other pages including adding new ip6tables rules for DHCPv6 UDP port 546/547, but I can't get the br-wan6 interface to go live and acquire an IPv6 IP. If your . 11 comments. The WAN(br-wan) and WAN6(br-wan) interfaces are part of the "wan" firewall zone which consists of "wan:" and "wan6:". The /etc/config/dhcp6c file controls the WIDE-DHCPv6 client package wide-dhcpv6-client configuration. A number of ddwrt users , myself included prefer dnsmasq over radvd. I think the option mtu statement sets the MTU for physical interface If no, maybe something else is hindering odhcp6c from receiving the advertise message or Looks like for all the world like DHCPv6 requests are not going through the PPPoE link. Does it work now? In wan zone input is dropped/rejected, so you do need specific allow rules for the DHCPv4/v6, ICMPv6 and other flows. But I'm not sure about this. 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. Does this also apply to dhcpv6 traffic? Pinging IPv6 hosts from the router works as expected. For an uplink with native IPv6-connectivity you can use the following example configuration. This archive is an effort to restore and make available as much content as possible. MX Series,M320,M120. wan is not bridged by default, nor is it needed to allow dhcp. However I am getting the following odhcp6c error: daemon.err odhcp6c[21313]: Failed to send RS (Address . If you do not agree leave the website. I have a Linksys router running OpenWRT 18.06.5, and am getting an IP address and a prefix delegation from my ISP (Comcast). So 60 should work fine. In May 2018, the OpenWrt forum suffered a total data loss. Override the DUID used for DHCPv6 requests. prefix ::/56 infinity; So the first thing I would do is use a custom dhcp6c config using the above example. The DHCP client can then configure an IPv6 address on its LAN interface using the prefix it received. The problem seems to be with DHCPv6. . Sorry that I overlooked this. I don't see any dhcp6 solicit to start with. Make sure you have a big terminal window then it's a simple expression to filter the output to leave DHCPv6 over PPPoE. I only configured the pppoe on wan and wan6 was almost ready from factory config. NAT66 and IPv6 masquerading. (non-bridged) interfaces in case no delegated prefixes are available. However there was no prefix available from what I could see in the packet capture. I believe this can rule out the firewall from the list. More thinking aloud about why you do but I don't. save. Maybe there is a problem with netifd/ubus (or something else) where the reporting/handling of prefix delegation is bugged. Very clear and simple test. 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. That applies to ingress traffic. Then reboot the device. The problem seems to be with DHCPv6. IPv6 configuration. 1 will enable IPCP6 negotiation but nothing else, you'll need to manually configure a DHCPv6 interface then. Yes it is enabled and I have tried to loosen it up without any result. But I think this is not the case, the rules are applied before the network is started. Hmmnow my LAN DHCPv4 leases are no longer working. Then they will end up with wan6 and wan_6, which I don't think is a good idea. I can ping 8.8.8.8 from hosts. Did you set option ip6assign on your lan interface? odhcpd is a daemon for serving and relaying IP management protocols to configure clients and downstream routers. I'm not sure. Also you acknowledge that you have read and understand our Privacy Policy. I have expanded it with some of the information above. Maybe OpenWRT will fallback to a different prefix length but I'm also not sure about this one. The RG then hands out other /64 in this /60 to dhcpv6 client requests on the LAN, one /64 for each unique IAID. I think tcpdump 'sees' traffic before iptables, at least for inbound traffic. Default rules apply to interfaces that are not assigned to any zone. It uses the first /64 from this /60 for the directly connected LAN network (wired and Wi-Fi). However when I run 'ifstatus wan' I see the IPv6 address associated to the wan interface and nothing appears on wan6. I have PPPoE as well. Do you have any other (alias) interfaces configured on eth0? 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. I may have a fiddle at some stage. I had tried them both options, with auto (wan_6) and manual (wan6). It will try to acquire ipv6 for itself and a prefix for the lan. Do you have banip, bcp38 or similar packages installed? They are ACCEPT/REJECT, but should not matter, as interfaces are assigned in wan zone. Using the basic algorithm: PD Address Space / Number of LAN Ports = block size per port. The hint is hex from 0-F. On the OPNsense WAN interface it has a static IPv4 and does DHCPv6 with prefix delegation. This HOWTO explains how to configure OpenWrt to: Enable IPv6 on the Freebox. How to use OpenWrt behind a Freebox with IPv6 delegation. Try "option ipv6 auto", this should automatically spawn a virtual DHCPv6-PD interface. Content may be missing or not representing the latest edited version. Maybe the auto spawned wan_6 interface doesn't enable delegation by default. Thanks for the tip on adding 'tcpdump'. It defines basic properties and interface settings . "option ipv6 1" under wan, so to configure wan6 manually. Obtain IPv6 public network delegation in OpenWrt. I guess, when the firewall is started, otherwise, it would make no sense. Basic Properties Other than the usual PPPoE negotiation and some failed DHCPv6 requests on the LAN side there's nothing. Now all is well. Had to re-enable the "br-lan" interface and combine eth0.1, wlan0, and wlan1 so that DHCP would work again. If you use the auto in ipv6 option in wan interface, then wan_6 is created automatically and you cannot configure it. 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). It tries to follow the RFC 6204. requirements for IPv6 home routers. The valid options of this section are listed blow. Here are some configuration examples for some ISPs. LinkSys WRT32X with latest OpenWrt 19.07.5 r11257, Spectrum cable Internet. 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 (. This topic was automatically closed 10 days after the last reply. Sometimes delegation doesn't work, then it starts working again. Using LEDE 17.0.1.4. If you use 1 then you manually need to create wan6 interface and add all these options there. Perhaps it is an interface name thing - your "ipv6 option auto"==wan_6 compared to my "ipv6 option 1" == wan6. odhcp6c has a -v parameter to increase verbosity but I have no clue how to enable it via uci. You can use DHCPv6 prefix delegation to automate the delegation of IPv6 prefixes to the CPE. Maybe it is a problem with the latest version. 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. Did you enable/modify the default dhcpv6 firewall rule? No, he didn't mention the version, however I guess that he used the latest. 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 are config snippets that may be helpful: Thanks for the tip on adding 'tcpdump'. Multiple configurations exist but for my ISP using a fiber connection with an IPv4 PPPoE connection encapsulating DHCPv6 advertisement/solicitation this was required. The WAN interfaces came bridged that way out of the box, in the default configuration. New replies are no longer allowed. IPv6 WAN Status Type: dhcpv6-pd Prefix Delegated: 2001:db8:1234:5678::/56 Address: 2001:db8::abcd/128 [] However I would like to . Maybe you have to edit a script to enable it. but because of the 8byte overhead of pppoe the actual mtu will be 1484. Are you using PPPoE or do you have a plain Ethernet hand-off? Are sure 60 will work? Topic: How to Configure DHCPv6 client with prefix delegation on a :: /64 link What prefix length does your isp provide? I'd say it was even worse, as I noticed that with 'reqaddress force' I don't even get an address on the wan. However OpenWrt should reply with a request, instead it sends again solicit, server sends advertise and this continues indefinitely. 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. I already have "option ipv6 '1'" in the wan interface inside /etc/config/network. Abstract. Regarding why it broke delegation and not something else, I have no idea. So there must have been something blocking the DHCPv6 packets in the firewall due to the bridge interface? The original post can be found on the forum . I've tried about every combination. Because it is sent via multicast? # cat /etc/config/networkconfig interface wan Seems your issue is not with the configuration then, maybe an incompatibility between odhcp6c and your ISP? 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? The OpenWrt community is proud to announce the first release candidate of the upcoming OpenWrt 19.07 stable version series. If there are still problems you can post the following for troubleshooting. Are there different means of allocating ipv6 addresses besides DHCPv6? Setting it to auto will spawn a virtual interface wan_6 (note the underscore) which takes care of the prefix assignment. NAT64 for IPv6-only networks. When the zone rules are only get applied when an interface in that zone comes up then odhcp6c can never receive the advertise message. 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. 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. I just configured the wan and default input to ACCEPT. hide. The documentation for IPv6 doesn't mention wan_6 dynamically created interfaces. Namely: But still if someone has any idea, I am all ears. DHCPv6 was blocked at the wan zone. IPv6 extras. Full IPv6 connectivity from router and lan. I did not set anything up myself in this regard. WAN zone has default INPUT policy of DROP. Any ideas what is happening? (by default there should be one) In which configuration stanza? Except where otherwise noted, content on this wiki is licensed under the following license:CC Attribution-Share Alike 4.0 International. I have connected my travel router to my mother-in-law's . Did you disable/modify the default dhcpv6 firewall rule? You are absolutely right, that is what was happening. Normally it will be shown under "IPv6 WAN Status" in the "Network" section like. IPv6 with Hurricane Electric. Also make sure that your lan interface has option ip6assign 64 (or a larger prefix size) set to actually redistribute the received prefix downstream. 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. In wan zone input is dropped/rejected, so you do need specific allow rules for the DHCPv4/v6, ICMPv6, and other flows. The /etc/config/dhcp6c file controls the WIDE-DHCPv6 client package wide-dhcpv6-client configuration. That is what my ISP told me as well, they had trouble with autoconfiguration too. I just tried with a recently flashed Carambola2 on 18.06.5 that I keep spare. I have the same issue. In the ISP router I've enabled the 'exposed host' feature so its firewall is transparent. With prefix delegation, a delegating router (the BNG) delegates IPv6 prefixes to a requesting router (the CPE). IPv6 with Hurricane Electric using LuCI. 1 will enable IPCP6 negotiation but nothing else, you'll need to manually configure a DHCPv6 interface then. I'm also not sure how to configure the auto spawned wan_6 interface. It incorporates over 3700 commits since branching the previous OpenWrt 18.06 release and has been under development for about one a half years. Do you have any other (alias) interfaces configured for eth0? Yes, change 1 to auto - they have different meanings. If you want to contribute to the OpenWrt wiki, please post HERE in the forum or ask on IRC for access. 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. By default, all INPUT traffic is allowed (for every zone and can individually be overwritten per zone) //edit I have made it work, with a few workarounds. Weird, cause the IPv4 worked for years with this setting, and it is something I automatically configure in pppoe interfaces. I'm assuming I've done something dumb. I also have a Mikrotik device with dhcpv6 client and I would like to setup my OpenWRT to delegate prefix (/48 I got from HE) to be splitted to /60 to that mikrotik. 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. Since you are using dhcp for wan and dhcpv6 for wan6 the default configuration will work out of the box. Here is what I see on the WAN interface that relates to ICMPv6/DHCPv6: That is not correct. Regardless of that the pppoe interface still has the mtu set. 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. They suggest the fixed wan interface with a reqaddress: force setting but nothing much else. 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. Not sure if this was some defense measure from the ISP. 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. This requires a solicitation (UDP src 546 to dst 547) and a response (UDP src 547 to dst 546). I need some more practice with packet capture and interpretation. Moreover the only hit is from bogon_6 which doesn't contain the prefix of my provider or any link local addresses. If you do not agree leave the website. (/lib/netifd/dhcpv6.script). Is the routing an issue for wan6 or with the wan_6 interface you get with ''option ipv6 auto''? When you search for odhcp6c in the luci process overview (or 'ps | grep odhcp6c' in terminal), what parameters/flags are applied to it? I will have a play once I am allowed to fiddle with the router. It defines basic properties and interface settings. Yes, change 1 to auto - they have different meanings. And it was my wrong to use it without checking first documentation or the "ip link". With tcpdump I can see solicit from OpenWrt and advertise from server. Maybe I missed some update. This time I could see solicit, advertise, request and reply. Too much confidence I guess and I got carried away from other operating systems. Hi! I'm also not sure how to configure the auto spawned wan_6 interface. PPPOE for the IPv4 wan, SLAAC on IPv6 wan, and DHCPv6 for prefix delegation. The OPNsense LAN interface is split up using 802.1Q VLAN tags for different trust groups, e.g. But I suppose that if something that important was buggy, it would affect others too. I can manually insert a prefix and that gets delegated but the automatic Prefix Delegation that should 'just work' isn't working. Lo and behold, IPv6 now obtains an IP! its the network.wan6.reqprefix='auto' in your text listing. 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. I suggest to do a reset of the device to defaults and start from scratch. Maybe OpenWRT will fallback to a different prefix length but I'm also not sure about this one. odhcp6c receives the advertise message but there is a problem with the packet format or something. There is also no 'tcpdump' on this build so I can't inspect the raw network traffic. OpenWrt 19.07.0 first release candidate Installing and Using OpenWrt I have banip, but it is auto-adding the link local IP of my ISP in the white list. I noticed that in the config snipet that my ISP sent me there was no mtu=1492 in the wan interface. Self-registration in the wiki has been disabled. The prefix delegation occurs between a provider edge (PE) device and customer premises equipment (CPE) using the DHCPv6 prefix delegation option. And then configure all the settings in the interface wan6 section. 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 The loopback interface gets the first subnet assigned, lan the second. The odhcp6c command line looks fine to me. However, machines inside the network are only setting up link-local IPv6 addresses, so the SLAAC doesn't seem to be doing its thing. So if you set 1492 as MTU, eth0 MTU will be 1492 and The eth0 MTU was 1492 and pppoe-wan 1484. 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. What I was trying to say was when are the (wan) zone rules are applied? So I rebooted the device. 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. I tried to remove it too and it worked! My config since the second post is this one: Maybe the auto spawned wan_6 interface doesn't enable delegation by default. By using the website, you agree with storing cookies on your computer. But how can an MTU issue break delegation and not everything else also? 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. Do you see anything of interest in logread after ifdown wan; ifup wan ? It tries to follow the RFC 6204 requirements for IPv6 home routers. I was anyway using the defaults for the firewall, so if it didn't work for me it wouldn't work for anyone else. (-Ntry ?). 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. Ive sent details of my config to my ISP and they are investigating their end. This will set the assigned subnet of the /60. The following firewall rules allow this to work: I reworked the option ipv6 section of the wiki a few days ago. So if try to ping google.com, it doesn't pick up the IPv4 DNS. The WAN interfaces came bridged that way out of the box, in the default configuration. DHCPv6-PD should work by default on OpenWrt. I have configured wan and wan6 as interfaces in banip. I wonder why the wiki page recommends this setup? Is there no config interface wan6 section in your network config? odhcpd provides server services for DHCP, RA, stateless and stateful DHCPv6, prefix delegation and can be used to relay RA, DHCPv6 and NDP between routed. This rule is not needed, you are not running a dhcp6 server on the wan interface, are you? Except where otherwise noted, content on this wiki is licensed under the following license:CC Attribution-Share Alike 4.0 International. 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). I have a support ticket with my ISP open already. Any idea how to troubleshoot further? Firewall gets started (default policy set to DROP, network is not up/configured yet). SLAAC works fine, wan6 or wan_6 interface (option ipv6 in pppoe-wan 1 or auto, tried them both) has a correct IPv6 and can see it works with pings etc. I did not set anything up myself in this regard. With tcpdump I can see solicit from OpenWrt and advertise from server. Filter IPv6 incoming traffic. When the Openwrt router gets assigned a only single /64, there is nothing to delegate further for its own LAN side. I understand there are default wan6 firewall rules. Had IPv6 working great with DD-WRT on this device using DHCPv6 w/Prefix Delegation, prefix length /64, Radvd enabled. Now, what happens when someone changes the default input policy to drop/reject? And remove the route6 config section. Even though the tcpdump log shows the dhcpv6 response from the server, I think tcpdump 'sees' traffic before iptables, at least for inbound traffic. If yes, maybe there is a problem with the firewall and the firewall rules are not correctly applied at boot. His testing router (tp-link, not OpenWrt) successfully concluded the DHCPv6 sequence, while mine is stuck in the first 2 steps. However, I think I was getting DHCPv6 responses with option ipv6 1 and option proto dhcpv6 on wan6. Hello all, I recently managed to get IPv6 from my ISP, so I could drop HE tunnel. However, I think I was getting DHCPv6 responses with ''option ipv6 1'' and ''option proto dhcpv6'' on wan6. Or do you have to set option ipv6 '1' instead of 'auto' in the interface wan section? They use ipv6 'auto' and then do the configuration on the wan6 interface. (if the default input policy is set to drop/reject) Is this correct. I don't need non-default firewall rules using option ipv6 1 on wan and option proto dhcpv6 on wan6. By using the website, you agree with storing cookies on your computer. You may also want to look at using dnsmasq for your RAs / dhcpv6 oprions etc instead of radvd + dhcp6s. By the way, I tried that adjusted to my case, but no joy. IPv6 on L2TP softwire. My ISP doesn't delegate an IPv6 prefix and I get a default /64 with my IPv6 addresses from my provider's CPE/Router. https://openwrt.org/docs/guide-user/network/wan/isp-configurations. If yes, do you use the same version? OpenWrt Prefix Delegation address allocation has its roots in HomeNet RFC 7368. The section of type dhcp6c named basic defines common client settings. Not sure if this was some defense measure from the ISP, //edit 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). [Edit: Thanks for the tip on adding 'tcpdump'; I've added capture output below]. 14941 root 1028 S odhcp6c -s /lib/netifd/dhcpv6.script -Ntry -P0 -t120 pppoe-wan. When you send any egress traffic, the firewall is tracking the connection and allows the reply in. Doesn't matter. Well, I had a packet capture which shows blocked ports beforehand and DHCPv6 enabled over PPPoE afterwards, after enabling those two rules. 3. So you already tried the following config and it didn't work? Hi, Does this mean that the configuration should reference the dynamically created "wan_6" interface as opposed to "wan6" shown above? I removed the wan6 interface but wan_6 is behaving the same as wan6 was: Looks like no address is being allocated. Are sure 60 will work? For v4 as well, the reply is not coming from the same address it was sent to. Here is the interface config, again--out of the box plus my own IP assignments: I just manually unchecked "Bridge interfaces" in all of the interfaces, which seems to have gotten rid of the br-lan and br-wan interfaces, but still no change on the DHCPv6 side. It also provides initial support for the new ath79 target, the. (for example, dhcpv4/6) the ppp daemon gets launched with mtu 1492,

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