AWS issues with 172.0.0.0/12

[morrowc.lists at gmail.com (Christopher Morrow)]

possible that this is various AWS customers making iptables/firewall mistakes?
  "block that pesky rfc1918 172/12 space!!"

On Tue, Oct 1, 2019 at 8:51 AM Stephane Bortzmeyer <bortzmeyer at nic.fr> wrote:
>
> On Mon, Sep 30, 2019 at 11:38:25PM -0700,
>  Mehmet Akcin <mehmet at akcin.net> wrote
>  a message of 131 lines which said:
>
> > Here you go
>
> The two RIPE Atlas probes in the AT&T prefix seem able to reach AWS:
>
> %  blaeu-traceroute --protocol TCP --size=0 --port=80 --first_hop=64 --format --prefix 172.0.0.0/12 --requested 10 52.21.66.90
> Measurement #22932983 Traceroute 52.21.66.90 from prefix 172.0.0.0/12 uses 2 probes
> 2 probes reported
> Test #22932983 done at 2019-10-01T07:46:00Z
> From:  172.10.12.5    7018    ATT-INTERNET4 - AT&T Services, Inc., US
> Source address:  172.10.12.5
> Probe ID:  11203
> 64    52.21.66.90    14618    AMAZON-AES - Amazon.com, Inc., US    [11.43, 11.158, 10.806]
>
> From:  172.8.16.48    7018    ATT-INTERNET4 - AT&T Services, Inc., US
> Source address:  192.168.1.73
> Probe ID:  51354
> 64    52.21.66.90    14618    AMAZON-AES - Amazon.com, Inc., US    [22.301, 21.612, 21.615]
>