Pinning Multiple IPs on one device

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Thatdamnrainbow

• November 04, 2025 20:14

I have a Linux machine connected to a network on 2 interfaces over one physical port. It connects to a switch and gets untagged traffic as well as tagged vlan traffic. The firewalla sees this and gives it an appropriate IP for each interface, but the firewalla app only lets me reserve a IP address for the first interface it saw for this device. So I can pin my Linux box to one IP on one network but there’s no way to pin on IP on the other network. I’d like this managed at the DCHP server side rather than setting static IPs on the box itself. How do I pin/reserve an IP address for this machine on both networks?

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  Firewalla

  • November 04, 2025 20:54

  Firewalla is MAC based, if both of your linux instances uses the same MAC, then it is not possible to link static IP to both of them.

  You will need to configure the VM to use different MAC address

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  Thatdamnrainbow

  • November 05, 2025 08:36
  • Edited

  Container, not VM, but I see your point.

  However it looks like that reservation actually DOES work across multiple networks with the same MAC. From what I’ve observed, you can pin an IP on one interface that the app shows. Firewalla sees and works with it on all of the subnets but the app only knows how to show it on one at at a time.

  If you pin the IP on the network tha the app sees the device on, that last octet will also be set for the other networks it sees the device on too, even if the app doesn’t show that.

  I’m not sure if this is intentional behavior for the firewalla and frankly it’s not ideal for every use case like mine but for my uses this can work well enough. I just need to see if the setting persists over time.

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  Firewalla

  • November 05, 2025 16:39

  Firewalla indexes devices using their MAC address, so in the device page, firewalla will always show with MAC and if one MAC map to multiple IP, then the IP field under that MAC is really random

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  FirewallaSupportDesk

  • November 06, 2025 00:14

  In addition, if the 2 IPs are from different networks, you could make reservation on each one of them, when App shows the corresponding IP. The reservation for each IP will stay. 

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