Re: Anycast but for egress

[Owen DeLong via NANOG <nanog () nanog org>]

> On Jul 27, 2021, at 10:54 , Vimal <j.vimal () gmail com> 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?

Because there’s no good/reliable way to get the replies back to the correct initiating host.

Owen