Too Simple Blue to Red DNS Problem

Networking DNS
3

Welcome to the IPFire community.

Your dynamic leases for blue range from 192.168.20.1 to 192.168.20.255.
This isn’t right:

  • 192.168.20.1 is the blue IP of your IPFire system; first leasable IP should be 192.168.20.2
  • 192.168.20.255 is the broadcast address of network 192.168.20.0/24 ( your blue network ); last leasable IP must be 192.168.20.254

Have you tried with Primary DNS 192.168.20.1 for blue?
I do not recommend to use a secondary DNS server outside your local networks.

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