[ipv6hackers] IPv6 in GCP (WTH?): default route

[Andrew Walding]

Than you

On Mon, Jan 2, 2023 at 10:14 AM Fernando Gont <fernando at gont.com.ar> wrote:

> Hi, Andy,
>
> My bad (recent bad MUA config resulted in an HTML post).
>
> This is the link:
> https://cloud.google.com/compute/docs/ip-addresses/configure-ipv6-address
>
> Thanks!
>
> Regards,
> Fernando
>
>
>
>
> On 2/1/23 12:58, Andrew Walding wrote:
> > The hyperlink does not work….
> >
> > On Mon, Jan 2, 2023 at 8:40 AM Fernando Gont <fernando at gont.com.ar>
> wrote:
> >
> >> Hi. all,
> >>
> >> I happen to be playing with IPv6 on GCP, and seem to find a few
> >> "interesting" things.
> >>
> >> RAs on the IPv6 subnet are as follows:
> >>
> >> ---- cut here ----
> >> rdisc6 ens5
> >> Soliciting ff02::2 (ff02::2) on ens5...
> >>
> >> Hop limit                 :    undefined (      0x00)
> >> Stateful address conf.    :          Yes
> >> Stateful other conf.      :           No
> >> Mobile home agent         :           No
> >> Router preference         :       medium
> >> Neighbor discovery proxy  :           No
> >> Router lifetime           :            0 (0x00000000) seconds
> >> Reachable time            :  unspecified (0x00000000)
> >> Retransmit time           :  unspecified (0x00000000)
> >>    Source link-layer address: 42:01:0A:0B:00:01
> >>    MTU                      :         1460 bytes (valid)
> >>    Route                    : 2600:1900:4121:3b52::/65
> >>     Route preference        :       medium
> >>     Route lifetime          :           90 (0x0000005a) seconds
> >>    from fe80::4001:aff:fe0b:1
> >> ---- cut here ----
> >>
> >> As you can tell from the RA, it has a Router Lifetime of 0, so a
> >> compliant implementation will not install an IPv6 default router.
> >>
> >> (yes, the router sending this RA will work okay as a default router if
> >> you manually configure it as such, though).
> >>
> >> GCP claims that you can get the default route for an interface by
> >> querying the local metaserver
> >> (
> >>
> https://cloud.google.com/compute/docs/ip-addresses/configure-ipv6-address).
> ..
> >>
> >> which I guess one would query over IPv4? :-)
> >>
> >> Thoughts? Comments? Input?
> >>
> >> Thanks!
> >>
> >> Regards,
> >> --
> >> Fernando Gont
> >> e-mail: fernando at gont.com.ar
> >> PGP Fingerprint: 7F7F 686D 8AC9 3319 EEAD C1C8 D1D5 4B94 E301 6F01
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> >>
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>
> --
> Fernando Gont
> e-mail: fernando at gont.com.ar
> PGP Fingerprint: 7F7F 686D 8AC9 3319 EEAD C1C8 D1D5 4B94 E301 6F01
>