Is my upstream ISP sending me bad Router Advertisement?

[anav]

and this is why I am loving my ipv4!!

[CGGXANNX]

7.21.3 should finally fix this (hopefully)

@EdPa

• ipv6 - do not invalidate router if RA without included prefix is received (introduced in v7.21);

[markonen]

@CGGXANNX

Then adding the router to the default router list only depends on "Router Lifetime" (RA Lifetime) being non-zero, not on the presence of the prefix information or the M flag. And criteria for the added default router to be used or not doesn't depend on those informations either.

I wish they also implemented the inverse of this next: installing addresses for the received prefix even if the router lifetime is zero.

[Znevna]

Now THAT would be against the RFC rules.

[markonen]

How so? Isn’t the router lifetime only about whether the router is a default router? The prefix information has its own lifetime?

[Znevna]

Good point. I don’t know then.

Still, why? Who does this?

[markonen]

Linux, for example, does this. I’ve used this for autoconfiguring link networks when link-local addressing doesn’t work for one reason or another

[Znevna]

Yup, can confirm that the route is installed now here too.