Re: : Can a prefix be never routed on Internet but used only for source address in IP packets?

[nanog--- via NANOG <nanog () lists nanog org>]

I believe IXP networks are usually like this. Globally assigned IPs, and routers can use their IPs on the network to 
originate ICMP packets (e.g. TTL exceeded during traceroute; or packet too big) but putting a route to the IXP network 
on the internet is strictly prohibited.


On 19 August 2025 20:40:20 CEST, "Jakob Heitz (jheitz) via NANOG" <nanog () lists nanog org> wrote:
> ICMP packets from internal devices. Example “unreachable”.
>
> Kind Regards,
> Jakob
>
>
> ----------------------------
> 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
>
>
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