Hi Mike,

In general, no, there's nothing that prevents you from doing that.

In days gone by, some networks used to require consistent advertisements from a given ASN in all locations in order to peer.

In your case, that would have made it economically disadvantageous to use the same ASN in Makai as California, as you'd end up backhauling a lot of traffic.

These days, consistent advertisement requirements have largely gone by the wayside.

Now, from a network reachability perspective, you should also think about your own internal network connectivity.

If you're using the same ASN in California and Makati, you'll need redundant internal network connections between the two countries to ensure you don't end up with a partitioned ASN.

Remember, California won't accept the advertisements from Makati over the external Internet, as AS-PATH loop detection will drop the announcements; likewise, Makati won't hear the advertisements of the California IP space.

So, if your network design is a single internal backbone link from CA to PH, with an expectation that if the link goes down,  you can just use transit providers to reach the other location, you'll be in for an unhappy surprise when your backbone link goes down.

For that reason, many networks find that the cost of acquiring a second, distinct ASN for the remote location is considerably lower than the headache of trying to ensure the single ASN is never partitioned. 

But that's really more from a network design perspective; from a policy perspective, there's largely nothing preventing you from doing that.

Best of luck!

Matt

On Fri, Jun 9, 2023 at 12:28 PM Mike <mike+lists@yourtownonline.com> wrote:

Hello,

     I'm certain this must have been covered before but I can't find a
lot of good-seeming answers. Essentially, I am a California based ISP
and have plans to open up shop in Makati Philippines. I have an ASN and
several /22's of ipv4 and a few /44s of ipv6 out of my assigned ranges
that I intend (desire) to bring with me. I am just wondering if there is
any network policy, filtering, or other reason why I simply couldn't
just pop up there advertising my space and away I go? I do have ROA
setup with arin already which should otherwise verify/validate me (great
tool by the way, thank you).


Thank you.