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
> <[email protected]> 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.
>
> Sriram
> _______________________________________________
> NANOG mailing list
> https://lists.nanog.org/archives/list/[email protected]/message/MSEGDFSZ75EMKVD2FWPFSJBOB24X5GQR/
_______________________________________________
NANOG mailing list
https://lists.nanog.org/archives/list/[email protected]/message/2HPUZXWTDJ257Q3LCDVYKOR4IH72SM5T/
