OPT1 needs LAN DNS access

lewis

I must be staring at this so hard that I'm not seeing something really small and in my face.

johnpoz

@lewis said in OPT1 needs LAN DNS access:

The Interfaces section does have the gateway of 192.168.254.1 with mask of /24.

huh? So on your opt2 interface you set a gateway, and you pointed it to itself?

You do not set gateways on pfsense local networks.. Gateways are how you get off the network - they are for wan interfaces only..

stephenw10

Did you confirm that you're able to ping 192.168.254.1 from a client on LAN?

This could be a firewall rule in OpenWRT blocking access from outside it's own subnet.

But, yes, putting a gateway on the pfSense OPT2 interface is incorrect and will introduce a number of ways it could fail.

Steve

lewis

I always thought each interface would need its own gateway to make it its own private network. OPT1 has its own gateway and that one seems to work fine. Here is how both look.

lewis

@stephenw10
My test was to ping/nmap from a client on the LAN and could not ping or see anything on 192.168.254.0/24.

I then ssh'ed into pfsense and dropped to the command line and from there am able to ping the 192.168.254.1 gateway and other devices on the same network.

stephenw10

Those interfaces look fine. They have IP addresses but not gateways defined like the WAN does.

So you cannot even ping the OPT2 interface IP (192.168.254.1) from a client on LAN?

johnpoz

@stephenw10 said in OPT1 needs LAN DNS access:

So you cannot even ping the OPT2 interface IP (192.168.254.1) from a client on LAN?

Yes this is big question.. If your client on lan is using pfsense as its gateway. And it doesn't have a mask problem where it thinks 192.168.254.1 is on its own lan - you should be able to ping it.

You sure your clients on lan are not using say a /16 mask, they would think 192.168.x is local to them and never send it to pfsense. This would allow you to talk to your opt1 network since its 10.x but no you wouldn't be able to talk to another 192.168 network through pfsense, if your not sending pfsense the traffic in the first place.

lewis

@stephenw10

Correct. Here is a test from a client on the LAN side.

# nmap -sP 192.168.254.0/24
Starting Nmap 7.70 ( https://nmap.org ) at 2021-12-27 17:43 MST
Nmap done: 256 IP addresses (0 hosts up) scanned in 10.47 seconds

# nmap -sP 10.0.0.0/24
Starting Nmap 7.70 ( https://nmap.org ) at 2021-12-27 17:44 MST
Nmap scan report for 10.0.0.1
Host is up (0.00022s latency).
Nmap scan report for 10.0.0.29
Host is up (0.00063s latency).
Nmap scan report for 10.0.0.30
Host is up (0.00051s latency).
Nmap scan report for 10.0.0.52
Host is up (0.00077s latency).
Nmap scan report for 10.0.0.211
Host is up (0.00091s latency).
Nmap scan report for 10.0.0.212
Host is up (0.0098s latency).
Nmap scan report for 10.0.0.214
Host is up (0.00056s latency).
Nmap done: 256 IP addresses (7 hosts up) scanned in 10.07 seconds

johnpoz

@lewis what is the mask on your client on lan?

ipconfig on windows

Ethernet adapter Local:

   Connection-specific DNS Suffix  . :
   IPv4 Address. . . . . . . . . . . : 192.168.9.100
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.9.253

ifconfig on linux

ens3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.2.12  netmask 255.255.255.0  broadcast 192.168.2.255
        inet6 fe80::11:32ff:fe22:cc7d  prefixlen 64  scopeid 0x20<link>
        ether 02:11:32:22:cc:7d  txqueuelen 1000  (Ethernet)
        RX packets 13788691  bytes 7585716775 (7.5 GB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 9887749  bytes 1520893783 (1.5 GB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lewis

@johnpoz
Wait, you might have something.
Yes, the client I was testing from has a /16.
This is a test from another client with a /24.

# nmap -sP 10.0.0.0/24
Starting Nmap 6.40 ( http://nmap.org ) at 2021-12-28 08:28 MST
Nmap scan report for 10.0.0.1
Host is up (0.00023s latency).
Nmap scan report for 10.0.0.29
Host is up (0.00066s latency).
Nmap scan report for 10.0.0.30
Host is up (0.00066s latency).
Nmap scan report for 10.0.0.52
Host is up (0.00052s latency).
Nmap scan report for 10.0.0.211
Host is up (0.00062s latency).
Nmap scan report for 10.0.0.212
Host is up (0.012s latency).
Nmap scan report for 10.0.0.214
Host is up (0.00052s latency).
Nmap done: 256 IP addresses (7 hosts up) scanned in 14.86 seconds

# nmap -sP 192.168.254.0/24
Starting Nmap 6.40 ( http://nmap.org ) at 2021-12-28 08:28 MST
Nmap scan report for 192.168.254.1
Host is up (0.00029s latency).
Nmap scan report for 192.168.254.2
Host is up (0.00043s latency).
Nmap scan report for 192.168.254.10
Host is up (0.013s latency).
Nmap scan report for 192.168.254.11
Host is up (0.21s latency).
Nmap scan report for 192.168.254.16
Host is up (0.24s latency).
Nmap done: 256 IP addresses (5 hosts up) scanned in 26.94 seconds

stephenw10

Yup, that would do it! Fix the mask on that client.

lewis

@johnpoz

Wow, good catch folks!

It just happens that my go to Linux client and the Windows machine I'm on have a /16 because of some other work I was doing a while back.

Changing them both back to /24 fixes the problem :).

It was something tiny I wasn't seeing at this point. Now I'm able to reach devices on the 192.168.254.1 network.

lewis

And I think I used the wrong term about gateways above causing you some confusion. What I meant was the static ip4 config per interface.

This was like making a single character coding mistake and it takes a week to find that one thing that broke everything.

Thank you very much for sticking to this and helping me.

jsmiddleton4

Did you leave the AP IP as DHCP?

I thought AP's needed Static IP.

If the AP is an AP I thought all of the stuff like DNS/DHCP was managed by the actual router. DNS/DHCP info passes from the PFSense router though the AP.

I have Asus AX86U with RMerlin's FW as an AP. But I did my PFSense LAN as a Bridge.

Glad its working of course. Just trying to connect the dots.

stephenw10

Yeah adding a gateway to an internal interface because you want clients on that subnet to use it as their gateway is a common setup mistake. If you hang around the forum for a while you will see people do that and it causes a number of fun problems.

johnpoz

@jsmiddleton4 said in OPT1 needs LAN DNS access:

thought AP's needed Static IP.

Why would that be? The IP on the AP is only used for management of the AP.. How it gets that IP makes no difference, and its not used in any fashion where anything other than management would need to talk to that IP.

jsmiddleton4

@johnpoz

So you can find the AP when needing to access it for setup.

lewis

@jsmiddleton4 said in OPT1 needs LAN DNS access:

Did you leave the AP IP as DHCP?
I thought AP's needed Static IP.
If the AP is an AP I thought all of the stuff like DNS/DHCP was managed by the actual router. DNS/DHCP info passes from the PFSense router though the AP.
I have Asus AX86U with RMerlin's FW as an AP. But I did my PFSense LAN as a Bridge.
Glad its working of course. Just trying to connect the dots.

I had changed the AP to DHCP client to test it getting the correct network settings. It gets a static IP from the pfsense DHCP server and the AP clients get their DHCP settings from pfsense as well. All are static in fact so I can keep track of what is on the networks.

jsmiddleton4

@lewis

A+B=C. The IP for the AP stays the same.

Mine is assigned a static IP of its own yet outside the DHCP range of PFSense DHCP server.

stephenw10

Yeah a real AP (acting as only an AP) is a layer 2 device, it doesn't actually need an IP at all. Though not having one is very inconvenient if you ever want to change anything.