Re: pppoe, dhcpcd v6 and renew

[Roy Marples <roy%marples.name@localhost>]

On 11/11/2017 21:32, Manuel Bouyer wrote:
> Hello,
> my new DSL provider has an ipv6 setup which requires the client side
> to send a Delegated Prefix request to get the NRA to route the ipv6 block
> to the client.
> I could do this with dhcpcd:
> interface pppoe0
>          noipv6rs
> 	ipv6only
> 	ia_pd 0
> 	ipv6ra_noautoconf
> 	nogateway
> 	nohook resolv.conf, hostname, ntp.conf
> 	noipv4
>
> my router just needs to send a dhcp6 request or rebind, it doesn't need
> to handle the reply (everything is static).
>
> The problem is, if for some reason the pppoe session terminates,
> the kernel will successfully initiates a new one but dhcpcd doens't send
> a rebind, and the ISP stops routing my prefix. I have to manually
> restart dhcpcd to fix this.
> I tried ifwatchd but pppoe doesn't send events in this case.
>
> I tried to add a 'leasetime 600' in dhcpcd.conf, in the hope that
> dhcpcd would periodically send a rebind but it doens't happen.
>
> Any idea how this could be properly fixed ?
> I could periodically start dhcpcd from cron but I'd prefer a cleaner
> way to achieve this ...

PPPoE needs to send the link down media event when the session 
terminates and the link up media event when it gets a new one.

Then both dhcpcd and ifwatchd will see this.

Here's the patch I make for PPP for this very thing, it just needs 
adapting to PPPoE I think.
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/net/if_spppsubr.c.diff?r1=1.149&r2=1.150&only_with_tag=MAIN&f=h

Roy