Caddy on device with multiple IP address

1. Caddy version (caddy version):


2. How I run Caddy:

loaded as a service. autostarts.

a. System environment:

Distributor ID: Debian
Description:    Debian GNU/Linux 11 (bullseye)
Release:        11
Codename:       bullseye

b. Command:

Paste command here.

c. Service/unit/compose file:

Not using docker

Caddy is running nicely here and everything is working. However, the device it runs on currently has 1 ethernet nic with one address ( ). Soon that will change. We plan to add a 2nd address to the nic eg ( ) . Some traffic will be routed to it on each address.

Right now it is simple - one address - Caddy listens on multiple ports and responds accordingly . But we are trying to understand how to configure it so Caddy can service 2 different IP addresses and ensure that all response traffic is sent back only via the same ip address… For example where it serves out a webpage on , it would be a different webpage to serve out on

Even if anybody can point us to the right section in the documentation about how to configure like this . We have already searched the doc and have not found anything similar. We hope that Caddy can actually do this …

You’re looking for the bind directive which will let you choose which interface to bind to:

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Thank you for that . We have looked at BIND , but we were not sure if it would be enough. Can you confirm that we can BIND to multiple (eg 2 ) IP addresses at the same time ? Our reading of BIND is that it specifies which (ie singular) IP it is going to BIND to… Did we understand it wrongly ?

Maybe we need to run 2 CaddyServer - one on each IP address ?

Caddy binds to all interfaces by default, i.e.

If you need two different sites to run on two different IPs, then run Caddy something like this: {

	reverse_proxy somewhere:8080
} {

	reverse_proxy elsewhere:8080
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Thank you !!!
That is exactly what we were hoping to have confirmed :smile:

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