Sure. A large American mobile operator did that with a lot of their DNS traffic for a couple of months. :-) Of course you may be talking about doing it _intentionally_. I don’t know of a reason to do it, but sure, it can be done. It’ll get dropped by anybody running uRPF. -Bill
On Aug 19, 2025, at 18:35, Sriram, Kotikalapudi (Fed) via NANOG <nanog@lists.nanog.org> wrote:
Question: Can a prefix be never routed on the Internet but used only one-way for source address in IP packets?
That is. a user owns an IP prefix. They never advertise a route to it in BGP on the Internet. But they use the prefix solely for source address in IP traffic from a source to a destination (sink). In this set up, the destination server obviously cannot/doesn't return any acknowledgements etc. to the source. Anyone aware if there is any such known application in use on the Internet - even if it is rare? Thanks.
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