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Using floating IP for outbound connections

Posted December 23, 2020 164 views
UbuntuNetworking

I just setup a droplet and assigned it a floating IP. I believe it should be possible to configure the OS (Ubuntu in my case) to use that floating IP for all outbound connections instead of the anchor IP, I just don;t know how to accomplish this.

I need to do this reliably because I am connecting to an external API that requires connections to come from a whitelisted IP. And changing the whitelist is a slow manual process so my hope is to use the floating IP to ensure it shouldn’t have to be changed even if I have to rebuild the server or something.

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ryanUrchin
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2 answers
Yannek December 30, 2020

Hi @ryanUrchin,

I believe I met a problem similar to yours and found two workarounds to it. Before I share them I would need some clarification from you.

You wrote
I believe it should be possible to configure the OS (Ubuntu in my case) to use 
that floating IP for all outbound connections instead of the anchor IP

I am pretty sure you mixed up your droplet’s anchor IP with its public IP. It would not be possible to communicate across the internet with an anchor IP as a source one. An anchor IP belongs to ipv4 range that is designated to private (local) networks. You can retrieve your droplet’s anchor IP executing a command below (due to the appropriate DO’s doc):

curl -s http://169.254.169.254/metadata/v1/interfaces/public/0/anchor_ipv4/address

Is that right, or I misunderstood your description ?

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ryanUrchin December 30, 2020
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