Redirect IoT Units to Most popular DNS Servers | by Teri Radichel | Cloud Safety | Nov, 2022 | Area Tech

Leverage PFSense NAT guidelines to redirect DNS requests when the gadget itself would not permit it

This can be a continuation of the posts on community safety.

Within the final publish, I defined the right way to disable IPv6 in PFSense after which utterly cease logged visitors after disabling IPv6 in PFSense.

On this publish, I will present you the right way to redirect DNS requests to your most well-liked DNS supplier. Word that this doesn’t embody DNS over HTTPS (DoH) requests that I merely block.

Possibly I will write extra about DoH later.

This answer additionally helps with the Google DNS bypass I wrote about above, until in fact it is DoH. For those who block DoH, Google seems to fall again to straightforward DNS, so this resolves the next situation and redirects visitors to your most well-liked DNS servers:

This cloud answer can even allow you to detect malware DNS connections to alternate DNS servers.

You may wish to do your individual testing to verify this works as anticipated and would not break issues in your community.

NAT port forwarding to bypass scrambled DNS servers

One of many issues that basically annoys me with some IoT and Wi-Fi gadgets is that they do not permit you to ahead DNS to your most well-liked DNS servers. I wrote about why I like utilizing CloudFlare’s DNS right here:

I can often pressure these gadgets to make use of the DNS server I wish to use by creating NAT guidelines in PFSense to redirect any DNS visitors to alternate servers to go to CloudFlare.

To configure a NAT rule for this goal, go to:

> Firewall > NAT

This is an instance of how I arrange that rule for a selected port that I named PORT1:

I’ve seen issues and assaults on DNS forwarders and resolvers and I want to separate the DNS portion of the community to go on to CloudFlare and let my Firewall deal with different issues. I do not resolve DNS for gadgets utilizing my firewall, though that may cut back visitors destined for the Web.

I can use the same method to redirect annoying ICMP visitors that’s continuously pinging throughout the Web by redirecting that visitors to my firewall and permitting it to reply.

These guidelines might not work if a supplier is particularly attempting to succeed in their very own servers, however normally it is only a easy gadget attempting to determine whether or not or not you are linked to the Web or resolve domains. It is not clear to me why these hosts should be hardcoded to explicit DNS servers. They may simply use DHCP and no matter DNS title is supplied by the native community, however in any case, this solves the issue 99% of the time, so I can create fewer firewall guidelines and have a much less complicated community.

Comply with for updates.

teri radichel

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