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I tried many times to make my router work in the configuration I want, but no matter what I do, it won't work..

The configuration :

ISP router: IP address 192.168.99.1 all ports forwarded to 192.168.99.2 connected to a Cisco Small Business RV 325 configured with the 192.168.99.2 IP address on WAN port.

I set some VLANs on the RV 325 :

  • VLAN 1 => default, gateway 192.168.99.254 No DHCP
  • VLAN 10 => for workstations IP 192.168.1.1/24 GW 192.168.1.1 DHCP Enabled
  • VLAN 20 => for VOIP IP 192.168.2.1/24 GW 192.168.2.1 No DHCP
  • VLAN 30 => for IP cameras IP 192.168.3.1/24 GW 192.168.3.1 No DHCP

By default the VLAN option is not enabled. I can access to the internet, but I don't have the benefit of the VLANs. When I enable it, I can't get access to the internet anymore...

Most of the time, I get an error referring to DNS error so I suspected a missing firewall rule.

So, I've tried multiple firewall rules (even ANY to ANY), but I never succeeded.

What can I do to make this router work with VLANs?

This is the interface I have to setup for the router

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    Are you setting different subnets for each VLAN? If so Each VLAN needs a gateway in its own subnet. For instance, your VLAN 10 in the 192.168.1.0/24 subnet would need a gateway in the 192.168.1.0/24 subnet – Ron Maupin Oct 29 '15 at 17:41
  • Hi Ron, yes I have set one for each vlan. – Jefferson B. Elias Oct 29 '15 at 18:18
  • The next question is whether or not you have DHCP set up uniquely for each VLAN. – Ron Maupin Oct 29 '15 at 18:28
  • For VLAN 10, yes. For the others, no. – Jefferson B. Elias Oct 29 '15 at 18:33
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    I believe the VLANs are only for the internal LAN ports and don't apply to the WAN ports on this device. Your VLAN 1 IP address overlaps with the WAN interface IP address putting the same subnet on both sides of the RV325. This should only work if the WAN port is configured as a "Transparent Bridge" as per documentation. For normal operation these two subnets should be different. – YLearn Oct 29 '15 at 20:59
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first of all, thank you for your questions and answers.

The solution was provided by YLearn :

I believe the VLANs are only for the internal LAN ports and don't apply to the WAN ports on this device. Your VLAN 1 IP address overlaps with the WAN interface IP address putting the same subnet on both sides of the RV325. This should only work if the WAN port is configured as a "Transparent Bridge" as per documentation. For normal operation these two subnets should be different.

I changed the VLAN1 to another IP range and enabled VLAN. It worked like a charm.

  • You should accept your answer so that the question doesn't keep popping up, looking for an answer. – Ron Maupin Oct 30 '15 at 13:40

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