[linux] IPv6 dhcp PD 'komt niet aan' ...

[Mike Jonkmans]

On Fri, Aug 20, 2021 at 06:42:31AM +0200, Udo van den Heuvel wrote:
> Goede morgen,
> 
> On 19-08-2021 22:54, Geert Stappers wrote:
> > > Uit https://bugzilla.redhat.com/show_bug.cgi?id=1956209
> > > 
> > > # ip -6 a s dev ppp0
> > > 20: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1492 qdisc cbq state UNKNOWN group default qlen 3
> > >      inet6 fe80::c5d5:e942:39c7:7eb7 peer fe80::9ecc:83ff:fec6:e7e5/128 scope link
> > >         valid_lft forever preferred_lft forever
> > > 
> > > Ik denk dat 'scope link' er voor zorgt dat de reply naar de FORWARD chain gaat.
> 
> Op https://www.juniper.net/documentation/en_US/release-independent/nce/topics/concept/subscriber-management-dual-stack-dhcpv6-pd-over-pppoe-nce.html
> staat bij DHCPv6 Prefix Delegation over PPPoE:
> 
> The CPE obtains a link-local address...

Kennelijk klopt dat wel.

> # cat /etc/ppp/options
> lock
> lcp-max-configure 3
> lcp-restart 15

> >> routes: ip r.
> 
> # ip r
> default dev ppp0 scope link
> 10.0.0.0/24 dev eth1 proto kernel scope link src 10.0.0.150
> 192.168.10.0/24 dev eth0 proto kernel scope link src 192.168.10.98
> 194.109.5.212 dev ppp0 proto kernel scope link src 82.161.210.87
> # ip -6 r
> ::1 dev lo proto kernel metric 256 pref medium
> unreachable ::/96 dev lo metric 1024 pref medium
> unreachable ::ffff:0.0.0.0/96 dev lo metric 1024 pref medium
> anycast 2001:981:a812:: dev eth0 proto kernel metric 0 pref medium
> 2001:981:a812::/64 dev eth0 proto kernel metric 256 pref medium
> unreachable 2002:a00::/24 dev lo metric 1024 pref medium
> unreachable 2002:7f00::/24 dev lo metric 1024 pref medium
> unreachable 2002:a9fe::/32 dev lo metric 1024 pref medium
> unreachable 2002:ac10::/28 dev lo metric 1024 pref medium
> unreachable 2002:c0a8::/32 dev lo metric 1024 pref medium
> unreachable 2002:e000::/19 dev lo metric 1024 pref medium
> unreachable 3ffe:ffff::/32 dev lo metric 1024 pref medium
> fd00:c0a8:a00:1::/64 dev eth0 proto kernel metric 256 pref medium
> fe80::2a8a:1cff:fee0:9484 dev ppp0 proto kernel metric 256 pref medium #
> dhcl server
> fe80::39e3:264d:9db9:83ec dev ppp0 proto kernel metric 256 pref medium #
> ppp0
> fe80::/64 dev eth0 proto kernel metric 256 pref medium
> multicast ff00::/8 dev eth0 proto kernel metric 256 pref medium
> multicast ff00::/8 dev ppp0 proto kernel metric 256 pref medium
> default dev ppp0 metric 1 pref medium
> Groeten,
> Udo

Geen defaultroute in /etc/ppp/options
Maar waar komt dan die default vandaan?

Het kan handig zijn om eth0 tijdelijk down te brengen:
	ip link set eth0 down
En dan te kijken wat er gebeurd.
(verdacht: fe80::/64 dev eth0 proto kernel metric 256 pref medium)
En doe dan ook je firewall even uit.

Groetjes, Mike Jonkmans