I suspected at
some point that there is a network using 44 addresses
internally, had some leaks on them and that the garbage (DNS replies,
ICM rejects, IP fragments and such stuff) were the replies from hosts on
the internet receiving that traffic and sending replies back via the
ampr-gw.
I think that is not a legitimate use but an attack group that spoofs sender
addresses when sending their attacks and they use net-44 addresses as well.
To have that go down, more ISPs should implement BCP38 (source address filtering).
Unfortunately, there is little incentive for ISPs to do that, because it benefits
only others and not themselves.
Generaly speaking, yes, but not in this case.
If I understand correctly, the traffic drop was inbound from ipip-mesh,
that means:
some-ham-host -> ipip -> ucsd (-> inet or 44.0.0.1).
^
Measure in the Graph
=> Thus we're not talking about a faked IP address.
It was either a case (or legitimite use) of
- a ham-host sending traffic to ucsd (or via ucsd to the inet, or via ucsd to the inet
to a bgp announced ham host (wich is even more legitimte))
- responses of inet attacks to a ham-host (good connected, the drop was abt. 3MBit) and
this host has enabled his firewall for not sending RST, icmp unreachable, etc..
Without more detailed information, all we can do is to speculate.
If you ask me, it was
- a ham who looked for weeks two or more HAM Webcam streams has closed his browser
or
- a ham has forgotton to switch off his file sharing tool before going online in the
amprnet
or
- a ham has his default-route to the internet via ucsd and watched TV
or
- perhaps, somewhere in the world there was a huge ham event with many visitors? (then
3MBit is "nothing")
or
- a ham computer with a virus, attacking the world
or
- some services like DMR changed their infrastructure
or
- an ampr ipip host had a service which was used from an internet bgp-announced network
and it delivered ham content (dmr, etc..) via ipip->ucsd->44-inet-host.
or
much more cases
If we'd have sflow/netflow data, we'd know what happened.
vy 73,
- Thomas dl9sau
