BGP routing ARIN space in APNIC region

Fri Jun 9 19:54:59 UTC 2023

Matt Harris
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matt.harris at netfire.net
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On Fri, Jun 9, 2023 at 2:49 PM Matthew Petach <mpetach at netflight.com> wrote:

>
> 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 at 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.
>>
>
I would also note that, from an end-user perspective if we're talking about
ISP services to customers on both ends here, you may run into geolocation
issues where some geolocation providers decide that many/all of your users
are in one location or the other, creating problems for them both with
performance when they are misdirected to the wrong frontend servers, as
well as in terms of convenience if they are being served content in the
wrong location, or service issues related to access to streaming services,
etc.

- mdh
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