Multiple 1:1-NAT with multiple DHCP

[lucasgirod]

Newbie question here...

I'm trying to do the following:

My ISP does not provide static IPs, but multiple IPs via DHCP.
I have two Synologys which I want to be externally accessible (Ports 80,443, DynDNS), both are on the LAN.

I tried the following:

• Attach 3 Ports to the ISP-Side (WAN, SYNO1, SYNO2)
• Assign Alias-IPs for SYNO1 and SYNO2
• 1:1-NATs from Alias-IP1 to SYNO1 and Alias-IP2 to SYNO2.

But no luck...

It works if I use the DHCP-Adress for 1:1-NAT, but as this address can change this is obviously not an option.

Can anyone point me in the right direction?

Thanks