The Firewall configuration is fairly basic at this moment though it's worth noting that I am setting an MSS clamp of 1460. I've broken the configuration sections into top level categories for further clarification, however, these sections are really one large config file as found in /config/config.boot. This basic blog post is simply covering the configuration I'm running at this moment. I've setup my ERL-3 in a fairly basic matter at this moment however it's serving its purpose and doing so in an absolute fantastic manner. Set policy by subnet and log all DNS queries to sites based on internal LAN IP.I've recently installed an EdgeRouter Lite 3 (ERL-3) in my home network to facilitate my internet connection and provide service to my local networks.
Opendns updater edgerouter Pc#
If you want to test your configuration simply run a couple of NSLOOKUP commands from a command prompt: Confirming approved resolvers are working Confirming other DNS requests are dropped Want to Super Charge DNS Security and Visibility on your Unifi Network?Ĭheck out our Cloud Managed on premise DNS Relay that runs on anything from a Linux PC to Raspberry Pi. If using multiple services or a NAT type multi-policy, you can allow specific resolvers based on subnet/VLAN Test and Confirm You can add additional revolvers at any time by editing the Allowed Resolver group. Port Group: All DNS Create WAN Out rule droping all TCP and UDP traffic out the DNS Port Group The Accept rule created in step 3 for our preferred resolvers will override. Port Group: All DNS Create WAN Out rule assigning Resolver Group to the DNS Port Group STEP 4) Create Firewall Rule Dropping all traffic on the DNS Port Groupįinally create a WAN Out Firewall Rule prohibiting all other DNS traffic on port 53. For this reason select both” TCP and UDP” under the IPv4 Protocol selection. Remember, although UDP is the default protocol for DNS, TCP can all be used. Now create a WAN Out firewall rule that allows ScoutDNS. Create IP based Resolver Object for your resolver IPs STEP 3) Create Firewall Rule allowing the Resolver Group In this instance we use our default primary and secondary ScoutDNS IPs but you can configure any resolvers that you may want to allow on your network. Next we will configure the IP based object for our actual resolver IPs. Create port based object for all DNS traffic STEP 2) Configure IPv4 Address/Subnet Group (Resolver Group) We will start out by configuring a port based object that represents all DNS traffic. Object based configuration makes managing systems so much easier. The end result will be something like this: Configured rules allowing only specific DNS resolvers STEP 1) Configure DNS Port Groupįirst configure the group objects within the firewall subtab.
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Opendns updater edgerouter pro#
This setup is for configuring DNS firewall rules on a Unifi Dream Machine Pro, but the basic rules and configuration are similar on the USG and USG Pro respectively. Forcing all DNS through a DNS firewall or RPZ will insure that all related traffic is properly vetted.
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While preventing content filter bypass is a good reason to manage DNS ports on your firewall, another often overlooked reason is to impede malware that has entered your network from using other outside DNS resolvers. “How do I prevent users from changing their DNS to bypass filtering?” Several of our small business, nonprofit, and education customers run Ubiquiti networks and so I thought it would be helpful to answer the following question using the Unifi Dream Machine Pro.