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0 pointsmanigandham9y ago0 comments

> anycast to determine location and then send the closest server IPs

Anycast doesn't determine location or send the closet IPs, it's all the same IP address announced using BGP (border gateway protocol) to automatically route to the closest (in network travel) server.

0 comments

problems9y ago

Of course. Let me clarify - they use anycast DNS to send the closest CF caching proxy's IP.

manigandhamOP9y ago

That's not how it works. Both their DNS and reverse proxy servers use anycast IPs without any DNS-based routing.

They did recently release some features called traffic manager that lets you control the origin server based on geo. If you just need geo-balanced DNS though, AWS Route 53, Azure Traffic Manager, and NSOne offer DNS based routing.

problems9y ago

Really? I didn't think they'd do anycast on their reverse proxy servers, that seems risky to me (ie: a TCP connection changes from one server to another due to a BGP change), but I suppose the odds are fairly low.

I seem to remember getting different IPs from different locations, but it could just be random or I could be mistaken.

EDIT: Tried now and it seems I'm getting the same IPs from Canada and Australia, so you are indeed correct.

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0 pointsmanigandham9y ago0 comments

> anycast to determine location and then send the closest server IPs

Anycast doesn't determine location or send the closet IPs, it's all the same IP address announced using BGP (border gateway protocol) to automatically route to the closest (in network travel) server.

0 comments

problems9y ago

Of course. Let me clarify - they use anycast DNS to send the closest CF caching proxy's IP.

manigandhamOP9y ago

That's not how it works. Both their DNS and reverse proxy servers use anycast IPs without any DNS-based routing.

problems9y ago

I seem to remember getting different IPs from different locations, but it could just be random or I could be mistaken.

EDIT: Tried now and it seems I'm getting the same IPs from Canada and Australia, so you are indeed correct.

1 more reply

j / k navigate · click thread line to collapse