How do I set up a dedicated IP address for a service in Ubuntu?

I've got 2 IP addresses for my machine, examples:

• x.x.x.1
• x.x.x.2

My current server address is x.x.x.1 and the server is running service A, B & C.

I would like to provide service A & B on x.x.x.1 and..
I would like to provide service C on x.x.x.2

It should not be possible to reach services assigned to another IP address (i.e. reaching service C on x.x.x.1 should not be possible).

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I've already added the secondary IP address to my interface.

Contents of /etc/network/interfaces.d/eth0.cfg:

# The primary network interface
auto eth0
iface eth0 inet dhcp

auto eth0:0
iface eth0:0 inet static
address x.x.x.2
netmask 255.255.255.255
broadcast x.x.x.2

How can I achieve my goal described above? Do I need to configure service C to bind on x.x.x.2 only? And/or is it possible to configure this in the firewall?

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