Ok, here's my issue When I came aboard here the previous guy had installed them and based-on my own experience haven't had issues deploying and maintaining them on a flat network. Therein lies my issue, VLANs. So here's what involved. At present I am in the process of revamping our core network this includes a Sophos XG for our primary network including wireless and a Unifi Security Gateway Pro 4 firmware v4.

The idea here is that I want our employees network traffic routed through the Sophos XG and the guest traffic routed through the Unifi Security Gateway. So with the way I have things configured, all wireless clients connected to our "Corporate" SSID are successfully assigned to the subnet and router of our primary router Sophos XG.

I have the switch ports on the port Unifi Switch set to "All", which I'm assuming also means "trunked", but I could be wrong. Still no IP addresses to anything connected to the Guest Wifi. I don't know what the interface looks like for ubnt switches but you need to set each port an AP connects to and all the uplink ports between switches basically everything between the AP and the internet gatewayso they are have VLAN 10 set as Tagged. So can you ping the gateway or another ip if you manually assign the ip address to a device connected to the guest network?

For testing, you might want to turn off the guest policy setting to make sure the unifi guest policies are not blocking your dhcp server. I tried to follow but I am not sure I got it right. If you assign it to a tagged VLAN you won't be able to manage it. This allows multiple untagged VLANs to operate on the trunked port. With this configuration I am able to have my main WiFi get addresses from the Again this is in the Cisco and Ruckus world but I hope my configuration can help lead you to a working configuration on the Ubiquity side.

I just compared your posted pictures against my own settings, and the Network settings are way off. The wireless settings should have 2 - 1 for the main network, and one for the guest network. Set the VLAN's in the wireless networks. In the Network Settings, you should have your primary management network information here set as corporate with no VLAN information. This is the network that your AP gets its IP address from.

If this is the same as your management network above, then this entry is not needed. Then add your guest network with VLAN information as well, since you are using guest management.

unifi dhcp snooping

If you are NOT using the guest management on the controller, this would not be needed, and you can simply use the guest wireless settings with VLAN to pass through to the network. Thanks everyone for the responses.

I'm just going to write one response to what has been suggested so far:. All APs are connected directly to this switch. I have tried this with Guest policy disabled. I only mentioned it to proactively head off anyone who may suggest I do that as a troubleshooting step.Don't take the suggestions of trying something else to harshly.

I know, I've read plenty of threads on here and on the internet in general that get derailed by this. That's one of the great things about having a lab, being able to explore. Plus, in real world production environments, sometimes when something doesn't work it's time to try something else. And don't get me wrong, if you want to stick with what you're doing and try and figure it out, by all means do so. I know what it's like to have something like this in front of you and just want to be able to figure it out just because it's a puzzle that needs solving.

By the way, Spiceworks has a Homelabs private group too. It's not super active, but you might check it out. Do I need a separate piece of equipment for the Or will my network configuration work as is? You need a router of some sort. I didn't look up the specs of your switch, but if it's a layer 3, they should be able to route. I don't think they will ever fix this issue. I have been dealing with this for almost a year at the house. It is their gear that is the issue, not your DHCP server.

Are you running a CloudKey or a standalone installation? Is this a guest network? When you are setting up a guest network you have to to set the IP for the router and controller to be allowed before authentication. Every time I get to a point where I have tried too many things to fix the problem I will just restore to an older working backup. We just ran into a similar situation with the latest firmware and a cloudkey GEN 2.

Now most of the devices on the network were Apple products and they noticed it more than others. But the windows boxes would drop as well. Basically, we did the following and everything is working perfectly.

Also, under SSID settings there is configuration called " I believe the key was changing the DTIM to 3. All the other settings were already there. I think if you have this checked you need to add your DHCP server to the exception list. Also, definitely get to the latest version of the controller and firmware. Basically as you know DHCP is based on broadcast traffic. Add the DHCP to exception list might help.

unifi dhcp snooping

Frustrating as it is, I am really glad that I am not alone with this issue. We are using a Cloud Key. This is site is a school, lots of different devices. I saw that this can cause issues so we changed that setting.

Five Things To Know About DHCP Snooping

No affect. I definitely can't see that it would hurt, we would just need to find a quiet time to do it. I have scheduled in a switch restart. As all of the APs are PoE this should restart them all.Range No config needed. The Unifi APs themselves can have any IP assigned to them you like, usually one on your production or management network -- they don't need a separate IP in your guest network's range.

Are you using the Unifi portal for your guest access? Not sure if that requires additional configuration. Do your settings look like this? Again, I don't use the portal so I'm not sure if that changes anything, but I don't believe it does. Perhaps the Ruckus controller has a configuration option which is overriding the IP Helper, but I am not familiar with Ruckus so that is just a theory.

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Ubiquiti Networks, Inc. UniFi AP Popular Topics in General Networking. Spiceworks Help Desk. The help desk software for IT. Track users' IT needs, easily, and with only the features you need. Also make sure no rules on the firewall are blocking traffic originating from the guest VLAN.

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UniFi USG DHCP Reservations

Read these nextDHCP snooping enables the switching device, which can be either a switch or a router, to monitor DHCP messages received from untrusted devices connected to the switching device. This information is used to build and maintain the DHCP snooping database. Only hosts that can be verified using this database are allowed access to the network.

DHCP allocates IP addresses dynamically, leasing addresses to devices so that the addresses can be reused when they are no longer needed by the devices to which they were assigned.

DHCP snooping acts as a guardian of network security by keeping track of valid IP addresses assigned to downstream network devices by a trusted DHCP server the server is connected to a trusted network port. By default, all trunk ports on the switch are trusted and all access ports are untrusted for DHCP snooping. You can configure an access port as trusted, or a trunk port as untrusted, using the overrides configuration statement with either the trusted or untrusted option.

In this event, the associated mapping entry is deleted from the database. When you move a network device from one VLAN to another.

unifi dhcp snooping

In this event, typically the device needs to acquire a new IP address. Therefore, its entry in the database, including the VLAN name, is updated.

When the lease time timeout value assigned by the DHCP server expires. In this event, the associated entry is deleted from the database. In this event, the lease time is updated in the database. Starting in Junos OS Release However, you can configure the bindings to persist by setting the dhcp-snooping-file statement to store the database file either locally or remotely.

Doing this prevents spoofing of DHCP server messages. DHCP snooping is not enabled in the default switch configuration. DHCP snooping is enabled automatically by Junos OS when you configure any port security features at the [edit vlans vlan-name forwarding-options dhcp-security] hierarchy level.

To disable DHCP snooping, you must delete the dhcp-security statement from the configuration. DHCP snooping is not disabled automatically when you disable other port security features. When supported by the server and set by the client, this option shortens the exchange from a four-way relay to a two-message handshake. The server is directly connected to the same switch as the one connected to the DHCP clients the hosts, or network devices, that are requesting IP addresses from the server.

The trunk port is configured by default as a trusted port. The server is connected to an intermediary switch Switch 2 that is connected through a trunk port to the switch Switch 1 that the DHCP clients are connected to. Switch 2 is being used as a transit switch.

The trunk interfaces are trusted by default. The switch is connected to a router that is, in turn, connected to the DHCP server. You can add specific static IP addresses to the database as well as have the addresses dynamically assigned through DHCP snooping. You do not assign a lease time to the entry.AggrInt1 is connected to a FortiGate that also have an aggregated interface.

All VLANs are set as corporate. Can someone please confirm and explain? Wired only "clients" for VLAN3 will be received by the switch. If true, then how? Link led indicators are active on both ports of each aggregated interface in every device. The IP Even though, I can ping all devices on the Again, I know that all others aggregated interfaces are working because I can ping everything from my computer except the FortiGate.

Not only that but on the HP switch I issued the command: display link-aggregation summary. On the Cisco switch I use the command: show interface port-channel 1 and on the Unifi switch the commands: telnet Everything seems to be in order.

Unifi Controller Setup

On the Unifi switch the mac address of the switches and the FortiGate are listed. Here is an article I used in order to create switch port profiles. So I have a switch port profile that has my native network for network management then tagged vlans for Guest, IoT, and Testing networks.

Hope this helps! The access points need probably trunking, the vlans need to be configured on the switches, the dhcp forwarding needs to be put in place, and and and First get a cables workstation on the switch, configure that port to that VLAN and make sure dhcp works. Ubiquiti documentation is notorious for being lacking.

It's one of the biggest gripes and lack of proper support from them. That's why their devices are inexpensive I suppose. There is a trade-off somewhere. It's only required if you want them to find the controller automatically.

At that point the unifi DNS records isn't needed. With the record it simplifies life as you can just power it up and it'll show up automatically pending adoption. If you can't get to the controller's web GUI from anywhere else, that's a firewall issue.The idea is to put key points about a technology into easily digestible bullet points.

I might also toss in a few things I learned from real-world deployments. What is DHCP snooping? DHCP snooping is a layer 2 security technology built into the operating system of a capable network switch that drops DHCP traffic determined to be unacceptable.

Rogue DHCP servers are often used in man in the middle or denial of service attacks for malicious purposes. However, the most common DoS scenario is that of an end-user plugging in a consumer-grade router at their desk, ignorant that the device they plugged in is a DHCP server by default. How does DHCP snooping track information? The database is a simple flat-file that can be stored in device flash.

What happens when a DHCP snooping violation occurs? If your switch is configured to send logs to a syslog server, you could consider escalating DHCP snooping alerts, as certain kinds of violations warrant further investigation. From a network design perspective, DHCP snooping is an access layer security feature. Note that if you are using layer 3 uplinks to your access layer as opposed to layer 2 Co-founder of Packet Pushers Interactive.

Writer, podcaster, and speaker covering enterprise IT. Deep nerdening for hands-on professionals. Find out more at ethancbanks. Fear of disrupting legitimate traffic has been the bane of network security for a long time.

The business is unimpressed when this happens, and a magnifying glass goes on the networking staff while the issue is resolved. IPS falls down quite notably in this way. How sad is it when not deploying a security feature is considered less risky than actually deploying the feature? Then again, vendors are somewhat to blame here. Be aware that DHCP servers such as Windows do not support option 82 and this will cause problems with snooping.

We do not use it for this reason, though I have heard folks talk about disabling the snoop information option to get around it. I am not sure if that will actually work though. I look to reading it as I do with everything here.

Even though I have been in the business over 20 years, I am guaranteed to a thing or two every I visit Packetpushers or listen to your podcasts. Really good post. This is a great cheat sheet. Would love to see one on Dynamic Arp Inspection, has anyone had success with it? Hello Team i have one query on the dhcp snooping. The end users are connected on the access stack. In this case the dhcp snooping database will be stored locally on the stack or centrrally for all stacks on the core switch.

One layer cannot be tailored for what it expects the next layer to do with the PDU.On this page we will be going through all the possible variables in the settings-tab in your Unifi controller. This is a work-in-progress by MPC. Unifi Controller settings page, settings here are global across the site. To access the settings in the controller click the gears icon in the lower right of the controller screen.

Here you can tell the controller what name your site should be displayed as. Standard it's marked as default, but especially when having multiple physical networks in a single controller, it can be useful to change this.

You might be thinking "well, i'll just change my settings to another country, so that I can crank up my power on my access points. Also keep in mind, when designing a network for use in situations where you might expect frequent visitors from other countries, that their equipment might not support all channels that are common in your country. Here you can select the time zone your network is in.

This impacts the scheduling feature for updating firmware. It can generate excess bandwidth usage. This will be the management LANI recommend reserving this for only unifi gear and other items pertaining to site administration. No routing is done by the USG.

This is used to provide point-to-point tunneling through the network without any routing. This would be used to tunnel a connection across the network such as a remote WAN, a private network with another router, ect…. The gateway created in the USG for a network. This can vary from 2 up to 16, host. Recommend enabling this on all guest connections. It may be wise to enable this on almost all networks unless you have problems with multicast devices. If nothing on that port has joined that group, the switch will prune it.

In a cascaded environment, this can significantly reduce inter-switch traffic. And likewise keep access links clear of traffic hosts don't want.

Cấu hình DHCP Snooping trên MikroTik

Recommended settings: Guest networks hrs sec Client networks hrs sec. Enables UPnP on this network. Recommend leaving disabled unless you plan to use programs that need UPnP vs manual port forwards Torrents, some games, ect…. Show pagesource Old revisions Backlinks Back to top. Share via Share via Unifi Controller Setup On this page we will be going through all the possible variables in the settings-tab in your Unifi controller.


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