cheap and omitted proxy ARP
mac_addr is th MAC address to be published for the specified hosts. It is normally the address of if_name. The format of mac_addr must be 6 colon-separated bytes of hexadecimal value, such as 00:00:01:01:14:46. The keyword auto can also be used to use the address of if_name from the system configuration.
A carp(4) virtual router address can be specified as vhid:<hex>
net_addr must be in dotted quad notation (for example 188.8.131.52) or be a 32 bit hexadecimal value starting with “0x” (for example 0x858a0186). net_mask can likewise be speficied as a dotted quad or hexadecimal value, or alternatively as a mask length. The following address specifications are therefore equivalent:
Multiple addresses can be specified. Addresses can be
excluded by preceding them with
choparp ne0 00:00:01:01:14:46 192.168.0.64/255.255.255.192