Anycast but for egress

Matt Harris matt at
Tue Jul 27 18:50:38 UTC 2021

Matt Harris|Infrastructure Lead
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On Tue, Jul 27, 2021 at 1:29 PM Vimal <j.vimal at> wrote:

> (Unsure if this is the right forum to ask this question, but here goes:)
> From what I understand, IP Anycast can be used to steer traffic into a
> server that's close to the client.
> I am curious if anyone here has/encountered a setup where they use anycast
> IP on their gateways... to have a predictable egress IP for their traffic,
> regardless of where they are located?
> For example, a search engine crawler could in principle have the same IP
> advertised all over the world, but it looks like they don't...  I wonder
> why?

Hi Vimal,
I'm not sure I see what the benefit would be here. Maybe if you explain
what exactly you're trying to accomplish, someone can point you in the
right direction? What you're describing here isn't really analogous to how
anycast works. Anycast isn't really a protocol in and of itself, it's
simply the act of advertising IP space externally in a diverse way and then
routing that traffic to the nearest capable host once it's inside your
network, rather than to a single very specific host that exists in one
specific place.

- mdh
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