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

[Fernando Gont]

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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-- 
Fernando Gont
e-mail: fernando at gont.com.ar
PGP Fingerprint: 7F7F 686D 8AC9 3319 EEAD C1C8 D1D5 4B94 E301 6F01