I try to set up Dhcp Option 120 - freeradius DHCP-SIP-Servers-DHCP-Option and Dhcp Option 43 - DHCP-Vendor using unlang, both are octet type. But is still faulted. I looked into a lot of docs but didn' t find any success resolution. So, how is the best way at unlang to: - convert ipaddr type to octet; - convert string to octet; - convert string to ipaddr ? I tried to use %{hex:192.168.0.254} and %{ipaddr: 192.168.0.254} but there is nothing. Also, I investigate that %{listen:src_ipaddr} is possible to use as some of pre-defined variable with Dcp IP. But its type is string. Also I tried %{hex: :%{listen:src_ipaddr}} and %{ipaddr:%{listen:src_ipaddr}} , there is no positive result. So, is there predefined variables, providing for example IP of Dhcp which I can use anywhere instead of specifying of 192.168.0.254 directly ? For example &DHCP-Domain-Name-Server += %{ipaddr:&some_variable}