Intervlan traffic being blocked
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Good day, i cannot figure out why traffic is being blocked even though the rule are set to the top
Pinging from 10.20.160.72 to 172.16.64.200 does not go through. When i look at the logs i do not see any icmp traffic but i do see logs for an rdp session. Does anyone know why?
The devices on the S interface can reach the internet -
@greatbush what is the network of Server, 10.20.160.0/24? And is 172.16.64.200 part of another VLAN?
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We need more info before we can do much here.
Are these on separate VLANs and subnets? Are you sure that the VLANs are configured correctly for all clients and on all switches?
It also could be the client devices firewall, if you have it enabled, it may be blocking pings from other subnets on it's own.
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@greatbush can't make heads or tales of which network is which here.. you have source 10.20.x.x on both interfaces. And then 172.16 as both source and a destination.
Which network is which here? You only need a rule that allows on the source of traffic interface..
pc -- S -- pfsense -- Servers -- server.
If you want pc to ping servers then the allow rule needs to be on the S interface of pfsense - what rules you have on the server interface in pfsense means nothing - you could have zero rules on that interface and the pc in S would be able to ping the server because pfsense would allow the return traffic via the state that was created when pfsense allowed the pc to talk to the server IP on the S interface as the traffic enters pfsense.
A see some traffic hitting that rule on your S. interface - that 0/1 KiB means that rule has seen 1 KiB of traffic.
But if server doesn't answer - then no you would never get an answer. Is the server using some other gateway? Is it running its own host firewall?
Do you have rules in floating?
For your source why are you not using S. subnet, and rules on your servers interface should be Servers subnet, etc.
Are these networks downstream networks and not actually the networks on the pfsense interface?
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SG-4860 24.11 | Lab VMs 2.8, 24.11 -
Server has an interface ip of172.16.64.1/21, vlan 48
S has an interface ip of 10.20.160.1/24, on vlan 16testpc [connected into port1 of S switch] -> S switch[connected into port 1 of server switch] -> Server switch -> pfsense
@planedrop i have disabled the firewall on the server at 172.16.64.200 and that didn't work. I know the server vlan is configured properly because it can reach other subnets without any issue. its just having trouble with the S subnet
@johnpoz apologies, i should have added more information. These are unifi switches, all you have to do is define the network and their vlans, set the port to the appropriate vlan and unfi does the rest.
I connected my test pc to port 1 on the S switch -> which has the Server switch as its upstream. The server isn't using another gateway
I have tried adding a rule on the server subnet
interface = server
source = S net
destination = Server netand
interface = Server
destination = S net
source = Server netand still nothing worked.
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@johnpoz This sounds like it could be a VLAN issue on the switch level, do you have this VLAN allowed on the switch port that the Server is connected to?
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@greatbush said in Intervlan traffic being blocked:
I have tried adding a rule on the server subnet
interface = server
source = S net
destination = Server netPointless and useless..
The rules on server interface have ZERO to do with S network devices talking to the Server network - like I said they could be blank and you could still talk.
Can your pc ping pfsense IP for its S interface? Can it ping the IP of pfsense IP on the Server network.
You would have to adjust your rules on the S network interface of pfsense to allow that.. Your current rule only allows for a source IP of 10.20.160.72 to talk to 172.16.64.200.. But you want to to validate your connectivity is correct.. Maybe you have rules below that allow? Which would be fine.
But you want to validate your connectivity to pfsense on your S network.. If you can ping the IP of pfsense on the Server network, but not things on the server network - then that screams firewall on the server device.
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@planedrop i have it allowed as an access port on the switch
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@greatbush And it's tagged on the other end of the switch going to the firewall?
And to be clear, you did not configure the VLAN on the server, right? Since the switch is handling the tagging for you.
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@johnpoz The test pc can ping pfsense ip for the s interface. The test pc is unable to ping pfsense ip for the server network.
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@planedrop No there are no vlans on the server. And yes its tagged on the trunk port. I have dhcp enabled for this interface and i am able to pull an from the pool i specified.
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@greatbush I think it's time to start packet captures.
From the rule you showed, that device on S should be able to ping across to Servers.
I would start a pcap on the S interface, then ping the server IP and see if you get ICMP packets to show up on the S interface.
If you do, then go to the Servers interface and do a pcap there and see if the ICMP packets show up there, this will tell you where the breakdown is. If they do show up, then it's not the firewall, if they don't then something is blocking them.
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@planedrop i have done that. all i see are echo ping requests but no response hence why i am scratching my head. I know the rules on the server interface aren't meant to be there but i was hoping that would fix the issue which it didn't
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@greatbush Did you do the pcaps on both interfaces from the pfSense side?
So you're seeing the echo requests, and you see them hit the S interface, and then also see them leave the Servers interface?
If that is the case, then your device on the Server interface isn't responding and the issue isn't pfSense specific.
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@greatbush said in Intervlan traffic being blocked:
The test pc is unable to ping pfsense ip for the server network.
Well then something is wrong.. is your client not using pfsense as its gateway - or is it running vpn?
On your pcap you did on the S interface you see the ping request from your S client to pfsense server IP?
I would guess possible mask issue maybe on your client - but that sure can not be the case if your pc is a 10 network and your server network is 172.x etc..
Hmmm - this is turning out to be something interesting with the info so far. You have no rules in floating? I would guess maybe a vpn on the pc? Like to see the pcap to pfsense S interface.. Its being sent to the pfsense mac address of S interface with destination IP of pfsense server IP.
example - I can simulate what sounds like your saying is happening by pinging an IP on another network on pfsense that doesn't exist.
So pc on my lan 192.168.9.0/24 pinging 192.168.3.14 (doesn't exist) but pfsense has an network 192.168.3.0/24
Notice the mac address it is sending to is pfsense mac address of my my lan interface on pfsense (192.168.9.253)
See how the mac in my packet capture is pfsense lan mac address.
If you are seeing similar when you sniff on S interface of pfsense - I can only guess floating rule blocking the traffic. Or something not right in pfsense.. Or like me your pinging an IP that doesn't exist? You sure you are pinging pfsense Server interface IP - etc..
edit: just for complete example - here is my pinging the actual IP of pfsense interface on that network 192.168.3.253.. See how the capture shows it still sending it to the lan mac address of pfsense.
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@greatbush Is it possible the subnet is configured wrong? Like, is the Servers interface actually setup with the right subnet and mask?
From what I am seeing, pfSense is getting the packet and allowing the connection, but if you don't see it on Servers, then for some reason pfSense isn't routing it to that interface.
Which means maybe the interface is setup wrong, or maybe pfSense's routing table has another entry from something like BGP?
Check your Route Table on pfSense: https://docs.netgate.com/pfsense/en/latest/monitoring/status/routes.html
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@planedrop i am hundred percent sure it is
test pc
unifi
pfsense
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What about the Servers interface though? The 172 network.
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@planedrop For the route
