On 2025-04-16, Hugo Osvaldo Barrera <[email protected]> wrote:
> I'm using dhcp6leased to request IPv6 prefixes from my ISP. Interfaces
> are properly assigned an IPv6 address as are downstream clients.
>
> However, the upstream link (e.g.: the one to my ISP) has no default
> route, and dhcp6leased is not assigning one, so my network is isolated
> and cannot reach the public Internet.
>
> **How can I debug why dhcp6leased is not assigning a default route to my
> upstream interface?**
dhcpv6-pd is just for assigning addresses to downstream interfaces.
> Below are finer details of my setup:
>
> My ISP's published documentation indicates:
>
> - VLAN = 6 with priority P-bit = 1
> - PPPoE via VLAN 6 (802.1q).
> - PPPoE authentication PAP with a username and password (e.g.:
> internet/internet).
> - Maximum packet size (mtu) 1500 bytes (rfc4638).
> - Obtain IPv4 address + DNS servers via PPPoE
> - Obtain IPv6 address range + DNS servers (IPv6) via DHCPv6-PD request
> (in PPPoE). Use one address from range for router.
>
> My interface configurations are as follows:
>
> # cat hostname.igc4
> description "WAN Interface"
> up
>
> # cat hostname.vlan0
> parent igc4
> vnetid 6
> up
>
> # cat hostname.pppoe0
> inet 0.0.0.0 255.255.255.255 NONE
> dest 0.0.0.1
> inet6 autoconf
> pppoedev vlan0
> authproto pap
> authname 'internet'
> authkey 'internet'
> !/sbin/route add default -ifp pppoe0 0.0.0.1
> up
>
> For this last, I've also tried with no `inet6` directive, as well as
> `inet6 eui64`.
if upstream aren't sending / responding to router advs over the pppoe
interface, you could maybe try the example !/sbin/route for inet6 that's
shown in pppoe(4).
> # cat dhcp6leased.conf
> request prefix delegation on pppoe0 for { pppoe0/64 vport0/64 }
>
> # ifconfig pppoe0
> pppoe0:
> flags=248851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST,AUTOCONF6TEMP,AUTOCONF6>
> mtu 1492
> index 8 priority 0 llprio 3
> dev: vlan0 state: session
> sid: 0x290e PADI retries: 1 PADR retries: 0 time: 13:51:31
> sppp: phase network authproto pap authname "internet"
> dns: 195.121.1.34 195.121.1.66
> groups: pppoe egress
> status: active
> inet6 fe80::XXXX:XXXX:XXXX:XXXX%pppoe0 --> prefixlen 64 scopeid 0x8
> inet 195.XXX.XX.XX --> XXX.XXX.XXX.X netmask 0xffffffff
> inet6 2a03:XXXX:XXXX::X --> prefixlen 64 pltime 122914 vltime 209314
>
> # cat rad.conf
> interface pppoe0 {
> default router no
> managed address configuration yes
> other configuration yes
> # I'm not certain that this last is required; I've tried
> # removing it with not positive results.
> }
> interface vport0 {
> default router yes
> router preference high
> }
>
> vport0 is connected to my LAN, where clients properly obtain an IPv6
> address. It is not relevant for this question.
>
> # pfctl -s rules
> block return out log proto tcp all user = 55
> block return out log proto udp all user = 55
> block drop all
> pass in inet6 proto ipv6-icmp all icmp6-type echoreq
> pass in inet6 proto ipv6-icmp all icmp6-type unreach
> pass in inet6 proto ipv6-icmp all icmp6-type timex
> pass in inet6 proto ipv6-icmp all icmp6-type routeradv
> pass in inet6 proto ipv6-icmp all icmp6-type neighbrsol
> pass in inet6 proto ipv6-icmp all icmp6-type neighbradv
> pass in inet proto icmp all icmp-type echoreq
> pass in inet proto icmp all icmp-type unreach
> pass in inet proto icmp all icmp-type timex
> pass out proto tcp all flags S/SA
> pass out proto udp all
> pass out proto icmp all
> pass out proto ipv6-icmp all
> pass in on egress inet6 proto udp from fe80::/10 port = 547 to fe80::/10 port
> = 546 no state
> match in all scrub (random-id max-mss 1440)
> pass out on pppoe0 inet from ! (egress:network) to any flags S/SA nat-to
> (pppoe0:0)
> pass out on pppoe0 inet6 all flags S/SA
> block drop in quick on egress from <private> to any
> block return out quick on egress from any to <private>
> pass in on vport0 all flags S/SA
>
> # pfctl -t private -T show
> 0.0.0.0/8
> 10.0.0.0/8
> 127.0.0.0/8
> 169.254.0.0/16
> 172.16.0.0/12
> 192.0.0.0/24
> 192.0.2.0/24
> 192.168.0.0/16
> 198.18.0.0/15
> 198.51.100.0/24
> 203.0.113.0/24
> 224.0.0.0/3
>
> Environment:
> System : OpenBSD 7.7
> Details : OpenBSD 7.7 (GENERIC.MP) #624: Wed Apr 9 09:38:45 MDT
> 2025
>
> [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
>
> Architecture: OpenBSD.amd64
> Machine : amd64
>
> Please let me know if I any additional information is relevant to better
> understand this situation.
>
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