# binding > Bindings of the DHCPv6 servers: the prefixes and addresses given to clients. Dynamic bindings are created from the server's pools; static bindings give a client, identified by its DUID and IAID, a fixed prefix or... ----------- ## ipv6/dhcp-server/binding **Type:** Directory Bindings of the DHCPv6 servers: the prefixes and addresses given to clients. Dynamic bindings are created from the server's pools; static bindings give a client, identified by its DUID and IAID, a fixed prefix or address. For details, see [DHCPv6 Server](../../../../network-management/dhcp/dhcpv6-server). The binding is invalid. The binding is disabled. The binding was assigned by a RADIUS server. The binding is dynamic. Use `make-static` to turn it into a static binding. Prefix or address assigned to the client. DUID of the client, in hex, for example `0x00030001dc2c6ee7106a`. Together with `iaid`, it identifies the client request the binding answers. Identity association identifier (IAID) of the client request. Together with `duid`, it identifies the binding. Type of the binding: - `na` - An address binding (IA_NA). - `pd` - A prefix delegation binding (IA_PD). Name of the DHCPv6 server that can offer this binding, or `all` for every server. Lifetime of a static binding. Dynamic bindings use the `lease-time` of the server. Default: 1w. IPv6 pool the prefix or address of the binding comes from. For addresses, the pool prefix length is 128. Options (`/ipv6/dhcp-server/option`) to send to this client. Bandwidth limit for the client, in the same format as the `rate-limit` of a DHCP server lease. The server creates a dynamic simple queue for the prefix or address of the binding. Whether this binding and a DHCP lease of the same client share one dynamic simple queue. Default: yes. IPv6 firewall address lists to which the prefix or address of the binding is added. Overrides the `address-lists` setting of the server. Where to place the dynamic simple queue created for this binding: `first` (default), `bottom`, or before the named queue. Parent of the dynamic simple queue created for this binding. Default: none. Queue type of the dynamic simple queue created for this binding. DHCPv6 server that serves the binding. State of the binding: - `waiting` - A static binding that is not in use, or a dynamic binding that was used before. The server keeps a dynamic binding for 10 minutes so the old client can get it back; after that the prefix can be given to other clients. - `offered` - The server answered a Solicit with an Advertise, but has not received the Request. The client has 2 minutes to request the binding. - `bound` - The client uses the binding. Time until the binding expires. Time since the server last received a message from the client, or `never`. IPv6 address the client sends from, usually its link-local address. The routes to the binding use it as the gateway. Key the server gave the client for authenticating Reconfigure messages (`use-reconfigure`). Replay-detection counter of the last Reconfigure message sent to the client. It increases with every Reconfigure message. FQDN the client sent (option 39).