Is it possible to route outbound traffic from a droplet through its floating IP. I.e., make http requests from the droplet that appear to originate from the floating IP?
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The short answer is yes. The longer answer is that it depends on the software you are using to make the request. It needs to expose some way of binding to a particular interface. If it does, you’ll need to find what we call the “anchor IP” and use it. The easiest way to find the anchor IP is to inspect your Droplet’s metadata. From the Droplet, run:
- curl -s http://169.254.169.254/metadata/v1/interfaces/public/0/anchor_ipv4/address
In my case, it returns 10.10.0.8 If you wanted to make your request with curl you could then use:
- curl --interface 10.10.0.8 https://example.com
Or with wget you would use:
- wget --bind-address=10.10.0.8 https://example.com
In both cases, example.com would now see the request as coming from my Floating IP not my Droplet’s IP address.
Check out this tutorial for more info on Floating IPs: How To Use Floating IPs on DigitalOcean In particular, see the section on “Droplet Anchor IPs.”
Step 1. Run this command to get the gateway for the floating IP
curl -s http://169.254.169.254/metadata/v1/interfaces/public/0/anchor_ipv4/address
Step 2. Run this command to make all outgoing connections appear to come from your floating IP, where $gatewayip$ is the ip obtained from the previous command:
route add default gw $gatewayip$
Someone could make a script to automate that in one shot.
here you go, This is the answer you are looking for: https://blog.programster.org/openvpn-digitalocean-ip-alias
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