Wireguard site to site vpn, lan site not accessible.

[sutha]

Hi,
I'm having a problem to connect my "Site A" to"Site B" VPN connection.
I have created on pfsense a wireguard tunneling system and completed according to this youtube video :"https://www.youtube.com/watch?v=7_gLPyipFkk"

From Site A:
I'm able to ping :
Both Pfsense Lan, Both pfsense wan, Both tunnel A/B, PC-1 and PC-2, but I can't ping PC-3 which is other site of the network (SiteB).
I'm able to access same side pfsense wan but not otherside.

From Site B:
I'm able to ping:
Both Pfsense Lan, Both pfsense wan, Both tunnel A/B, PC-1 and PC-3.
I can't ping PC-2,Pc-4,Pc-5 and Managed switch.

Routing:
From site A: all IP: 192.168.3.0/24 to tunnel site B.
From site B: all ip: 192.168.2.0/24 to tunnel site A.

rules:
Site A - wan interface:
protocol: UDP, source: site b public ip, destination: port: xxxxx.
Site A - tunnel interface:
protocol: any, source: any, destination: any
Site A - Lan
protocol: any, source:any, destination:any

Site B- wan interface:
protocaol: UDP, source: site a public ip, destination: port: xxxx.
Site B tunnel interface:
protocol: any,source: any, destination: any
Site A - Lan
protocol: any, source:any, destination:any
protocol:any, source:192.168.0.0/24, destination: any

Site B - Nat Port forward
interface: tunnel, protocol: any, destination: any, redirect ip: lan address
Site A - Nat port forward : none

How can i reach both site pc's for filesharing or remote access, also I'm looking for a forest setup. I'm looking to connect my existing Domain controller with another controller from another place.

Here is my network topology:

Did I missed anything here or wrong firewall rules, I'm open for any sugestion.
Thanks.

[Jarhead]

@sutha Your picture is a mess. Why do you have a pc in the B site subnet in the A site? And vice versa? Not to mention your wifi is in the WAN subnet?

Post screenshots of your wireguard configs.

[sutha]

Sorry for any inconvenience caused by my diagram. Actually, I don't have any duplicate PCs on my network. I tried to ping from Site B to this particular device, but mistakenly added it as a PC.

This is my actual state of my network.

And these are my setting from wireguard:

Sorry, that I have mask some of the information from the image. I have a succesful handshake on the tunnel. I'm able to ping both end of the tunnel without problem and I'm able to ping from pfsense the local lan 192.168.2.68 from site a and 192.168.3.68 from site b.
But I'm unable to ping crosover. I'm happy to correct my mistakes.
Thank you!

[Jarhead]

@sutha How is pc2 on the B site supposed to route anywhere??

Fix your allowed IP's.
Site A should have the IP's allowed from site B and vice versa. The site A pc's are already on that side, they don't need to be allowed to traverse the tunnel.
The tunnel allowed IP should be the subnet, so not a /32.
If you only want to allow one pc, it should be a /32 not a /24.

[sutha]

Now, I have corrected the IP range. See below the image.

As I said earlier, I'm able to ping both side tunnel (182.35.35.0/31 and both side pfsense.
Also from site A /Site B, I'm able to ping the local LAN.
But, I'm able to ping from the local LAN to site A only not Site B.

I suspect the managed switch on Site-B, do I have to allow the incoming traffic on pfsense from this negear switch(GS724TPS).
If yes, how do I do it.

[Jarhead]

@sutha You did NOT correct the IP's. At all.

The site A side should be allowing the site B subnets.
The Site B side should be allowing the site A subnets.
You have the site B allowing the LAN from site B. That's incorrect.

And fix your tunnel addresses.
You show 182.35.35.1 and 182.35.35.2 in the first post. But then you have it as a /31 in the Site A Peer, so 182.35.35.2 isn't included. Then you have it as a /32 on the site B config.
What are you using?? And why not use a private IP range? What's the point of the 182.x addresses?
Make the tunnel 182.35.35.0/30.

Site A should have the tunnel network and the Site B LAN as allowed.
So 182.35.35.0/30 and 192.168.3.0/24
Site B will be the tunnel and Site A LAN.
182.35.35.0/30 and 192.168.2.0/24

[sutha]

First of all, I'd like to thank you!
Recently, I have heard about pfSense, and I'm very impressed with how its site-to-site VPN works. I have people in three locations working with computers, and they use an Active Directory controller to log in to those systems. My plan is to manage all three locations from a single place, so I need to establish site-to-site VPN connections in all three places.

The scenario, which I've described here is just a testing environment. Once I have a good understanding of it, I'm going to implement it in our live environment.

Actually I have followed this youtube video: https://www.youtube.com/watch?v=7_gLPyipFkk

Simply expained:

• Vpn tunnel is establish and handshake is success.
• I can ping both side of tunnel ip from either side(182.35.35.1 and 182.35.35.2)
• I can ping both side of pfsense ip from either side as well(192.168.2.1 and 192.168.3.1)
• I'm unable to ping both side pc from opposite side:
  example: from site b to ping 192.168.2.68 or from site a to ping 192.168.3.68
• I can ping those PC from same side. from site a to ping 192.168.2.68 or from site b to ping 192.168.3.68 is possible.

There must be some sort of routing issue, but how. I have already a routing rule for "side a" 192.160.3.0/24 to 182.35.35.2 and for "side b" 192.168.2.0/24 to 182.35.35.1.
LAN rule is any and wireguard interface (WG0) rule is also any.

[Jarhead]

@sutha
Did you fix the allowed IP's and the tunnel?
If you're gonna have 3 sites you'll need to use a larger tunnel than the /30.

Didn't watch the video.
Follow this instead:
https://docs.netgate.com/pfsense/en/latest/recipes/wireguard-s2ms.html

[sutha]

Thanks for this link!
I'm sure, I'll have the same issue again but anyway. I think, this is the only way I can train myself.

I'll update the outcome very soon.

[sutha]

Hi, I have completed the site-to-site VPN configuration as per the provided link. Now, I'm encountering same issue as before.

I can successfully ping both sides of the tunnel and the allowed IPs from the diagnostics page of pfSense. Additionally, I can ping any PC locally on both sides. However, I'm unable to ping any PC on the other side of the VPN connection.

My Hardware connection:
Both pfSense network port 1 are connected to my router(WAN) with a local IP assigned from my router. However, my WAN IP on my pfsense is not my public IP. I'm using my second network port for LAN connection, where my PCs are connected.

I'm accessing my pfSense locally from one of the PC from on each side. But after configuring the site-to-site VPN, I can only reach up to pfSense. I'm unable to reach any PCs on the other side of network.

Am I missing any firewall rule for LAN, Currently I don't have any rule for Lan.
On wan, I'm port forwarding the wireguard port to wan address.
On tunnel interface all traffic allowed.
On LAN : None
There is a interface called wireguard, I don't have any rules in it.

I have changed my managed switch as well, so both side unmanaged switch connected on lan port.

[Jarhead]

@sutha If you don't have any LAN rules nothing on the LAN can talk to anything.
Do you mean you have no rules other than the default ANY rule?

Post pics.

Go to VPN/Wireguard click the edit button for the tunnel and post a screenshot. Block ONLY the the keys and endpoints.
Same with the peer.

If you followed that link, go to interfaces, click the one you're using for the tunnel and post a screenshot. No need to block anything on here.

System/Routing. Post a sceenshot.

Firewall/Rules. Post shots on LAN, Wireguard and the Wireguard interface.

[sutha]

These are the rules, which I have in pfsense firewall.
Wireguard:

Wan:

Lan:

Tunnel_WG0:

I have added the lan and wireguard rule, but lan rule make sense. After Adding lan, I'm able to ping from local pc to pfsense ip and from pfsense to local ip without any problem, but still having problem reaching other side of the tunnel.
Wireguard rule does not make any sense. I believe this is because I'm using the tunnel interface(WG0) for wireguard traffic.

My current Lan after adding the rule:

Current Status:

Currently I'm able ping from pfsense A to pfsense B, both tunnel ip and pfsense ip.
Next I'm able to ping from pfsense A to local pc's and pfsense B to local pc's as well, Both way.
I'm unable to ping from PC-A1 to PC-B1 or PC-B2, also from PC-B1 to PC-A1 or PC-A2.

Routing -A:
Gateway,

Static Route,

Routing-B: Same as A , but all remote IP(192.168.10.0/24) to tunnel A (172.25.25.1).
I don't know , if I forgot to forward some rule to other side of the tunnel.

[Jarhead]

@sutha You have to allow the listening port through the WAN. Add an allow rule for it.

[sutha]

I have add a rule for wan as well, see bleo the image.

I have added for both side and also tested with any protocol, but no luck. No changes after adding the wan rule.

Curiosity question:
Actually, I'm planning to connect my three locations via VPN to share files or work via remote desktop. I aim to control all PCs from one place.

I have not installed any additional software on any PCs to access my remote location, other than this pfSense site-to-site VPN setup.

[Jarhead]

@sutha Listen, I asked you for pics and you only gave me the firewall rules. I know you think you "have everything correct" but no one can help by just going with what you say.
Post the pictures you were asked for if you want further help.
And if you followed the link I provided exactly (you obviously didn't or the firewall rules would've been there already), it would work.

[sutha]

Okay, here is what you're expecting.
Side A:
Tunnel:

Peer:

Tunnel Interface:

Gateway:

Routing:

LAN rule:

Wireguard rule:

Tunnel-interface rule:

Site B:
Tunnel:

Peer:

Tunnel Interface:

Gateway:

Routing:

LAN rule:

Wireguard rule:

Tunnel-interface Rule

This is my total configuration.

[Jarhead]

@sutha You changed LAN subnets?
Not making this easy, are you?

Set the interface MTU to 1420 <--- DO THIS. Very important. (May fix your problem)

What you're calling Side A, what is the LAN subnet?

[sutha]

I have change the lan range but the subnetting is kept according to the link you provided. I want to avoid the same IP range again to avoid any complication with previous setting.
I have change the lan Interface mtu to 1420, it did not work then tried to change tunnel mtu as well but this is also not successful.
I have revert the lan mtu back to blank, but still not working.

Final outcome not working, current lan and tunnel interface mtu status are 1420.

Still can't ping other side local pc.
Side A is one of the location and Side B is the another location.
I have marked this in description of the Tunnel configuration as (S) and (I) .
Subnet for tunnel is x.x.x.x/30 and lan x.x.x.x/24 as you can see in the above configuration(don't compare with beginning of this chat).

[Jarhead]

@sutha I meant the WG interface MTU only. Bith sides should be 1420. No need to change the LAN MTU.

What is the local subnet on the side A?
I can't make the question any clearer than that. Thought that was clear enough in my last post.

(Hint, it's not x.x.x.x/24)

[sutha]

Local subnet is 192.168.10.0/24.