How can configure the Debian networking to allow Cloudflare to work on a static IP


I want to be protected by Cloudflare using FreeBSD. What I did has been the creation of a qemu virtual machine with Debian inside,where I have installed Clouflare warp and I’ve configured it in a way that I can forward the connection to FreeBSD. In short terms,this is how I configured Debian :

warp-cli disconnect 
echo 1 > /proc/sys/net/ipv4/ip_forward 
iptables -A POSTROUTING -t nat -s -j MASQUERADE 
warp-cli connect

and on FreeBSD :


Now,there is a problem with this setup. Basically in Debian the /etc/network/interfaces is configured like this :

allow-hotplug enp0s2 
iface enp0s2 inet dhcp

the problem is that is is using dhcp and sometimes the assigned ip changes. If it changes,I can’t surf from FreeBSD anymore. I tried to use a static IP like this :

iface enp0s2 
inet static address

but doing like that,Cloudflare does not work anymore.

So,the question is : how can configure Cloudflare on a static IP instead of using dhcp.

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