Imagine the following setup.
I have a machine A which exports a network share and is reachable under, say 1.1.1.1.
A second B machine with an IP, say 2.2.2.2, is mounting that share, everything's fine.
Now I'm trying to setup some kind of blue/green development.
The machine B starts with the IP 2.2.2.2. When I assign some kind of a new Virtual IP (like ElasticIP from AWS, but in my case Floating IP from Hetzner Cloud), I create a new POSTROUTING entry in the iptables with
iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source $FIP
which results correctly in
10 20 1415 SNAT all -- * eth0 0.0.0.0/0 0.0.0.0/0 to:x.x.x.x
That means, the machine B now communicates with the new IP address.
Here comes the pain:
I no longer can mount and/or ping the machine A with the IP 1.1.1.1 from machine B.
Machine A is 'pingable' from anywhere but from Machine B with the new IP address.
How come? Any ideas?
