Use Case: Configure Active/Active HA for ARP Load-Sharing
with Destination NAT in Layer 3
In this use case, both of the HA firewalls must respond to an ARP request for the destination NAT address. Traffic can arrive at either firewall from either WAN router in the untrust zone. Destination NAT translates the public-facing, shared IP address to the private IP address of the server. The configuration requires one destination NAT rule bound to both Device IDs so that both firewalls can respond to ARP requests.
- Enable active/active HA.
- Selectand edit.DeviceHigh AvailabilityGeneralSetup
- SelectEnable HA.
- Enter aGroup ID, which must be the same for both firewalls. The firewall uses the Group ID to calculate the virtual MAC address (range is 1-63).
- (Optional) Enter aDescription.
- ForMode, selectActive Active.
- SelectDevice IDto be1.
- SelectEnable Config Sync. This setting is required to synchronize the two firewall configurations (enabled by default).
- Enter thePeer HA1 IP Address, which is the IP address of the HA1 control link on the peer firewall.
- (Optional) Enter aBackup Peer HA1 IP Address, which is the IP address of the backup control link on the peer firewall.
- Configure an HA virtual address.
- Selectand clickDeviceHigh AvailabilityActive/Active ConfigVirtual AddressAdd.
- SelectIPv4andAddanIPv4 Addressof 10.1.1.200.
- ForType, selectARP Load Sharing, which configures the virtual IP address to be for both peers to use for ARP Load-Sharing.
- Configure ARP Load-Sharing.The device selection algorithm determines which HA firewall responds to the ARP requests to provide load sharing.
- ForDevice Selection Algorithm, select one of the following
- IP Modulo—The firewall that will respond to ARP requests is based on the parity of the ARP requester's IP address.
- IP Hash—The firewall that will respond to ARP requests is based on a hash of the ARP requester's source IP address and destination IP address.
- Committhe configuration.
- Configure the peer firewall, PA-3050-1 (Device ID 0), with the same settings, except set theDevice IDto0instead of1.
- Still on PA-3050-1 (Device ID 0), create the destination NAT rule for both Device ID 0 and Device ID 1.
- Selectand clickPoliciesNATAdd.
- Enter aNamefor the rule that in this example identifies it as a destination NAT rule for Layer 3 ARP.
- ForNAT Type, selectipv4(default).
- On theOriginal Packet, forSource Zone, selectAny.
- ForDestination Zone, select the Untrust zone you created for the external network.
- AllowDestination Interface,Service, andSource Addressto remain set toAny.
- ForDestination Address, specify 10.1.1.200.
- For theTranslated Packet, Source Address Translation remains None.
- ForDestination Address Translation, enter the private IP address of the destination server, in this example 192.168.1.200.
- On theActive/Active HA Bindingtab, forActive/Active HA Binding, selectbothto bind the NAT rule to both Device ID 0 and Device ID 1.
- Committhe configuration.
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