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VLAN Route to the Internet

Darwin Lambeth

I have a internal VLAN/Route behind my Sophos firewall and I cannot get out to the internet. I am using a Cisco 3950 setup with VLANS and I can access all nodes in my main network and my main network can access my VLAN devices internally, however my VLAN subnet cannot access the internet. The VLAN with the trouble is off my Cisco router. Below is a drawing of my network. I'm hoping its just a packet filter rule that needs to be added. Since my Cisco router address is 10.10.100.100 it should inherently be able to route to the internet I would think, but machines on my VLAN (192.168.25.x) can only access local lans. 



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  • +1

    Hi Darwin,

    As suggested by DKNL, first verify if you are able to ping UTM. Check 3 settings that needs to be configured:

    1. Firewall Rule - VLAN # > ANY > WAN

    2. NAT-Masq rule - VLAN # > External (WAN Address)

    3. VLAN # in Allowed Network in DNS global settings 

    If Web Protection is enabled then do not forget to add the new VLAN networks in the Allowed network.

    Thanks

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  • +1

    Hi Darwin,

    As suggested by DKNL, first verify if you are able to ping UTM. Check 3 settings that needs to be configured:

    1. Firewall Rule - VLAN # > ANY > WAN

    2. NAT-Masq rule - VLAN # > External (WAN Address)

    3. VLAN # in Allowed Network in DNS global settings 

    If Web Protection is enabled then do not forget to add the new VLAN networks in the Allowed network.

    Thanks

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