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Barracuda Link Balancer

How do I setup my Barracuda Link Balancer as a DHCP server?

  • Type: Knowledgebase
  • Date changed: 11 months ago
Solution #00004034

Scope:
All Barracuda Link Balancers all models, firmware version 2.1.0.010 and above.

Answer:
The Barracuda Link Balancer can act as a functional DHCP server with features that include the use of DNS servers, NTP servers, and WINS servers.

These settings can be found on the Services > DHCP Server tab:

To enable and configure the DHCP server:
  1. Set DHCP Server Enabled to 'Yes'.
  2. Set the following values, which are passed to DHCP clients:
    • DNS Server
      • Use default DNS server: The Barracuda Link Balancer identifies itself as the DNS server via its LAN IP address.
      • Use external DNS servers: The Barracuda Link Balancer provides the clients with the IP addresses of the DNS servers that you enter here.
    • NTP Servers
      • Use default NTP server: The NTP server passed to DHCP clients is the default domain (from Basic > IP Configuration) of the Barracuda Link Balancer.
      • Use external NTP server: The IP addresses of NTP servers that you enter here is passed to clients from the Barracuda Link Balancer.
    • WINS Servers (Optional)
      • Enter the addresses of your WINS servers, if you have them. (WINS is a naming service used to register and resolve name-to-address mappings for NetBIOS clients on TCP/IP-based networks.)
  3. Set the Default Lease Time to the default dynamic DHCP lease time, in seconds. The server uses the default lease time unless the client requests a specific lease time.
  4. Set the Maximum Lease Time to the maximum length of any DHCP lease. If the client requests a lease time, this is the maximum that will be allowed.
    • You can define the range of static and dynamic IP addresses available to be leased in the other sections on this page.
  5. Click Save Changes.

To configure Static Leases:
This section allows you to specify the range of IP addresses to be used for static allocations, to allocate addresses and to view IP addresses that have already been reserved. The already reserved addresses are shown in the list below the text entry area in the Static Leases table.
  • To define the range, enter the Beginning IP Address, the Ending IP Address and the Subnet Mask.
  • To manually assign an address to a system, type the system's hostname, MAC address and the desired IP address in the text entry field. The IP address must be within the Static Lease Range.
  • Click Add.
    • Note: Reserved addresses are not automatically reassigned. If the address is already in use, release the address in the Active Dynamic Leases table.

To configure Dynamic Leases:
This section allows you to specify the range of IP addresses to be used for dynamic allocations and to view dynamic addresses that are in use.
  • To define the range, enter the Beginning IP Address, the Ending IP Address and the Subnet Mask. This range must not overlap with the range for the static leases.
  • The Active Dynamic Leases table shows all active dynamic DHCP leases. Click Release to release a specific IP address and MAC address binding.

Link to This Page:

https://campus.barracuda.com/solution/50160000000HcNLAA0