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>Update: The IPv6 addresses which are used appear to be fictional. They haven’t been allocated yet and are non-routable.

What kind of network are they using that lets them send forged source addresses? Also, a temporary solution in that case would be to use a blocklist of non-allocated ranges.

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BT is UDP and you can write whatever you want into a packet.

Are you talking about changing source address in IP header? Most ISPs will drop such packets: https://tools.ietf.org/html/rfc3013#section-4.3

That's what I thought - but it turns out that not all ISPs behave well.

https://defcon.org/images/defcon-22/dc-22-presentations/Grah... but the video is also very entertaining. This is applicable to the IPv4 internet but I'm sure someone will eventually come up with a way to do it for IPv6.

Right. Looks like I'll have to add some networking to my to-learn list. Thanks.

BCP38 is what you want everyone to implement

http://bcp38.org

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