What is option 43 used for in DHCP?

When the DHCP server sees a recognizable VCI in a DHCP discover from a DHCP client, it returns the mapped vendor specific information in its DHCP offer to the client as DHCP Option 43. On the DHCP server , option 43 is defined in each DHCP pool (Scope) that offers IP address to the LAPs.

What is UniFi DHCP option 43?

UniFi APs have a default inform URL http://unifi:8080/inform. Thus, the purpose of using DHCP option 43 or DNS is to allow the AP to know the IP of the UniFi Network application host. To access the application remotely Remote Access will have to be enabled.

What is Option 4 DHCP?

Interesting Options DHCP option 4: list of time server as stated in the RFC868 (Time Protocol) DHCP option 12: host name of the client, very useful for IoT and any device without user. DHCP option 15: specifies the domain name that client should use as suffix when resolving hostnames via the Domain Name System.

What is DNS 43?

43. Vendor Specific Information. Sent from server to client. Vendor-specific information that the DHCP server has been configured to offer to the client. The information is sent to the client only if the server has a Vendor Class Identifier (VCI) in its table that matches the VCI in the client’s DHCPREQUEST.

What is DHCP option?

DHCP Options are additional IP address settings that a DHCP server passes to DHCP clients. When a DHCP client requests an IP address from a DHCP server, the server sends the client at least an IP address and a subnet mask value. Additional information can be sent to clients if you configure various DHCP options.

What is Option 82 Cisco?

DHCP Option 82 is organized as a single DHCP option that contains information known by the relay agent. This feature provides additional security when DHCP is used to allocate network addresses, and enables the Cisco controller to act as a DHCP relay agent to prevent DHCP client requests from untrusted sources.

How do I access my ubiquiti access point remotely?

Navigate to System Settings > Administration. Turn the Enable Remote Access feature ON. Enter your Ubiquiti account credentials to Remote Access Portal credentials on the login request and select Enable Remote Access. If you haven’t created an account yet, please do so now.

How many DHCP options are there?

ISC (Internet Systems Consortium) DHCP has five predefined option spaces: dhcp, agent, server, nwip, and fqdn.

How do I set DHCP options?

Configuring DHCP Options

1. Navigate to Security & SD-WAN > Configure > DHCP (or, on the MS switch, Switch > Configure > Routing & DHCP > [the interface being edited] > DHCP settings)
2. Select Add a DHCP option.
3. Select the desired Option from the list or if it isn’t listed, add a custom option.
4. Input the DHCP Code.

How are sub-options represented in DHCP option 43?

Each sub-option is represented by a grouping which includes a 2-bit header. The first value in the header highlighted in green indicates the Sub-Option (e.g. 0x01) The second value highlighted in orange indicates the Length of the sub-options value (e.g. 0x0C = 12)

What is DHCP option 43 for Cisco 1000 series?

As stated, the Option 43 sub-option code for the Cisco 1000 Series APs is type 102 (0x66). Create a new vendor class in order to program the DHCP server to recognize the VCI Airespace.AP1200. In the Server Manager window, right-click the IPv4 icon, and choose Define Vendor Classes. Click Add in order to create the new class.

What is DHCP option 43 for Cisco Aironet access points?

When DHCP servers are programmed to offer WLAN Controller IP addresses as Option 43 for other Cisco Aironet LAPs, the sub-option TLV block is defined in this way: Type – 0xf1 (decimal 241). Length – Number of controller IP addresses * 4. Value – List of the WLC management interfaces, typically translated to hexadecimal values.

What are the vendor specific options for DHCP?

Vendor Specific DHCP Options. RFC 2132 defines two DHCP Options that are relevant to vendor specific options. They are Option 60 and Option 43. DHCP Option 60 is the Vendor Class Identifier (VCI). The VCI is a text string that uniquely identifies a type of vendor device.