Re: pppoe(4) connection doesn't fully initialize ~50% of the time

On Mon 15/06/2026 20:11, Jurjen Oskam wrote:
> Hi,
> 
> I recently switched to another ISP, and it uses PPPoE so I set things
> up using pppoe(4). This works fine about 50% of the time: after a
> reboot of the OpenBSD box there's a ~50% chance that the link comes up
> correctly. The strange thing is that IPv4 connectivity does *not* work
> in that case, while IPv6 connectivity (via dhcp6leased) *does* work. A
> tcpdump of IPv4 traffic on pppoe0 shows only outbound packets (TCP
> SYNs, UDP, etc), nothing coming back in.
> 
> The PPPoE connection is from an Ethernet interface on my machine
> (igc1) directly to the ONT of the ISP. The ONT expects the PPPoE
> session on VLAN 6. The ISP has assigned a static IPv4 address.
> 
> I suspect some sort of race condition occurring somewhere, but I
> wouldn't know where to start digging. What would be the best way of
> debugging this?
> 
> The hostname.if files:
> 
> calvin# cat /etc/hostname.igc1
> media 2500baseT mtu 1508 up
> calvin# cat /etc/hostname.vlan6
> vnetid 6 parent igc1 mtu 1508 up
> calvin# cat /etc/hostname.pppoe0
> inet 45.142.146.140 255.255.255.255 NONE \
>         pppoedev vlan6 authproto pap \
>         authname '[email protected]' authkey '1234' \
>         mtu 1500 up
> dest 0.0.0.1
> inet6 autoconf eui64
> !/sbin/route add default -ifp pppoe0 0.0.0.1
> !/sbin/route add -inet6 default -ifp pppoe0 fe80::%pppoe0

Could you try hostname.pppoe0 with:

inet 45.142.146.140 255.255.255.255 0.0.0.1 \
	pppoedev vlan6 authproto pap \
	authname '[email protected]' authkey '1234' \
	mtu 1500 up
inet6 autoconf eui64
!/sbin/route add default -ifp pppoe0 0.0.0.1
!/sbin/route add -inet6 default -ifp pppoe0 fe80::%pppoe0