Redirect dns traffic to local dns server

tonysud

I want to REDIRECT dns request:
for example, pc1 has statical ip with static dns ( for example 8.8.8.8 or any other )
I don't want to change any pc settings, I want only to hijack dns traffic to another server
I could do it with iptables, but I don't want another pc always on only to redirect dns traffic
please let me know if I can do this with pfsense

bartkowski

I am doing that using a NAT rule and Port Forward.
Firewall>NAT>ADD New rule

Interface: LAN
Protocol: UDP
Source: I created an Alias for one of my devices or IP address of specific device
Source Port: ANY

Destination: INVERT MATCH Type: LAN Address
Destination Port: DNS (from/to).

Redirect target IP: IP of my PFSense LAN interface (e.g. 192.168.1.1)
Redirect target port: DNS

When completed, a rule will be added to Firewall/Rules/LAN called "NAT Redirect….". (1st rule)
Permit ANY LAN 53(DNS) - permit DNS to pfSense on my LAN interface. (2nd rule).

Block ANY ANY 53(DNS) - block DNS to everything else (3rd rule)

jahonix

@tonysud:

If I try to redirect with pfsense from originaldnsip to localdnsserver and then from a client I do dig hostname, I get error: reply from unexcepted source

Are your clients configured by DHCP or static?
With DHCP you could just tell them 192.168.0.99 to be their DNS server.

tonysud

client are statically configured
no dhcp

tonysud

@bartkowski:

I am doing that using a NAT rule and Port Forward.
Firewall>NAT>ADD New rule

Interface: LAN
Protocol: UDP
Source: I created an Alias for one of my devices or IP address of specific device

would it be possibile to make an alias for ALL ip in the lan?

I should redirects ALL client to my dns server

would it be possibile to use as dns server not pfsense itself but the dns installed on another machine?

bartkowski

@tonysud:

@bartkowski:

I am doing that using a NAT rule and Port Forward.
Firewall>NAT>ADD New rule

Interface: LAN
Protocol: UDP
Source: I created an Alias for one of my devices or IP address of specific device

would it be possibile to make an alias for ALL ip in the lan?

I should redirects ALL client to my dns server

would it be possibile to use as dns server not pfsense itself but the dns installed on another machine?

Try setting "LAN net"

jahonix

@tonysud:

would it be possibile to use as dns server not pfsense itself but the dns installed on another machine?

If you forward within pfSense you don't gain a thing (log wise) and if you redirect it you get an "unexpected source" error.
Best bet is to change the client's DNS settings to the "other" machine. Would be easy if configured by DHCP.

So I guess you'll have to die one death or the other.

Derelict

You will have a much easier time of it if you redirect clients to a server that is not on their local subnet.

If that is absolutely unavoidable I would redirect them to the forwarder on localhost and tell the forwarder to use 192.168.0.99.

You can even put the forwarder on a custom port for this purpose so the resolver can continue to function normally if desired.

jahonix

If I got it correctly then tonysud's main issue is with logging or how pfSense logs DNS queries.
But I didn't get that from the beginning…

If you have the forwarder look up at 192.168.0.99 then all queries source from pfSense and those logs do not show who made which request initially. Correct me if I'm wrong, please!

ziggyblur

What I would do is create a separate internal network with your DNS server. Create a separate network with a /24 netmask. Ideally physically separate it to your main network. As others have suggested, you can hijack the 53 forward packets to your DNS server in your separate network.

Do you have an available network interface in your pfsense router?