No DNS on a VLAN when switching it from one interface to a different one

  • I need to move a VLAN to a different interface during a testing period of a new Network appliance. One the Vlan is assigned to the different Interface we lose DNS hence no internet access.

  • Is this "different interface" enabled? Do you have any "allow interface to any" firewall rules on this interface? Is your DHCP server enabled on this interface?


  • The interface is enabled. DHCP is not required on this interface as a Windows server server is providing it. Rules are based on VLANS not interfaces so the Rules follow the re-assignment of the vlan to a different interface. DNS is failing when it's on the different interface. orig int = igb0 new int = igb3.

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