====== Multiple DHCP-Server instances ======

Having multiple DHCP-Servers running is very useful if you're dealing with [[documentation:general:network:vlan_support|VLAN's]], [[howto:use_cases:wireless:guest_ap|Guest AP]] or any kind of separating networks from another. To give each Network a different configuration of IP-Addresses, Netmasks or any settings which are provided to the clients by the DHCP-Server.\\

===== Overview =====

==== Level of difficulty ===

   Medium

==== Related topics ====

  * [[documentation:configuration:UCI]]
  * [[documentation:configuration:config_files:config_dhcp|/etc/config/dhcp]]
  
===== Instructions =====

==== GUI ====

Not available, yet

==== UCI Config System ====

  * **Add DHCP instance**
<code>
uci add dhcp dhcp
uci set dhcp.@dhcp[-1].interface=guest
uci set dhcp.@dhcp[-1].start=62
uci set dhcp.@dhcp[-1].limit=192
uci set dhcp.@dhcp[-1].leasetime=600h
</code>        
__Note:__ The option interface defines on which interface the dhcp-server is listening for dhcp-requests.

  * **Store changes**
<code>
uci commit
</code>

  * **Apply changes**
<code>
/etc/init.d/dnsmasq restart
</code>

==== UCI config files ====

The 'dhcp' options are stored in [[documentation:configuration:config_files:config_dhcp|/etc/config/dhcp]]

  * **DHCP instance**
<code>
config 'dhcp' 'guest'
        option 'interface' 'guest'
        option 'start' '62'
        option 'limit' '192'
        option 'leasetime' '600h'
</code>
__Note:__ The option interface defines on which interface the dhcp-server is listening for dhcp-requests.

  * **Apply changes**
<code>
/etc/init.d/dnsmasq restart
</code>

===== Troubleshooting =====

Not available, yet