Allied Telesis AT-WR4500 Dhcp Networks, Dhcp Server Leases, Submenu level /ip dhcp-server network

AT-WR4500 Series - IEEE 802.11abgh Outdoor Wireless Routers	121
RouterOS v3 Configuration and User Guide

Property Description

store-leases-disk (time-interval immediately never; default: 5min) - how frequently lease changes should be stored on disk

6.1.5 DHCP Networks

Submenu level: /ip dhcp-server network

Property Description

address (IP address/netmask) - the network DHCP server(s) will lend addresses from boot-file-name(text) - Boot file name

dhcp-option(text) - add additional DHCP options from /ip dhcp-server option list. You cannot redefine parameters which are already defined in this submenu:

Subnet-Mask (code 1) - netmask

Router (code 3) - gateway

Domain-Server (code 6) - dns-server

Domain-Name (code 15) - domain

NTP-Servers (code 42) - ntp-server

NETBIOS-Name-Server (code 44) - wins-server

dns-server(text) - the DHCP client will use these as the default DNS servers. Two comma-separated DNS servers can be specified to be used by DHCP client as primary and secondary DNS servers domain (text) - the DHCP client will use this as the 'DNS domain' setting for the network adapter gateway (IP address; default: 0.0.0.0) - the default gateway to be used by DHCP clients netmask (integer: 0..32; default: 0) - the actual network mask to be used by DHCP client

0 - netmask from network address is to be used

next-server(IP address) - IP address of next server to use in bootstrap

ntp-server(text) - the DHCP client will use these as the default NTP servers. Two comma-separated NTP servers can be specified to be used by DHCP client as primary and secondary NTP servers wins-server(text) - the Windows DHCP client will use these as the default WINS servers. Two comma- separated WINS servers can be specified to be used by DHCP client as primary and secondary WINS servers

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The address field uses netmask to specify the range of addresses the given entry is valid for. The actual netmask clients will be using is specified in netmask property.

6.1.6 DHCP Server Leases

Submenu level: /ip dhcp-server lease

Description

DHCP server lease submenu is used to monitor and manage server's leases. The issued leases are showed here as dynamic entries. You can also add static leases to issue the definite client (determined by MAC address) the specified IP address.

Generally, the DHCP lease it allocated as follows:

1.an unused lease is in waiting state

2.if a client asks for an IP address, the server chooses one

3.if the client will receive statically assigned address, the lease becomes offered, and then bound with the respective lease time

4.if the client will receive a dynamic address (taken from an IP address pool), the router sends a ping packet and waits for answer for 0.5 seconds. During this time, the lease is marked testing

5.in case, the address does not respond, the lease becomes offered, and then bound with the respective lease time

6.in other case, the lease becomes busy for the lease time (there is a command to retest all busy addresses), and the client's request remains unanswered (the client will try again shortly)

A client may free the leased address. When the dynamic lease is removed, and the allocated address is returned to the address pool. But the static lease becomes busy until the client will reacquire the address.