dhcp static mapping not working

Question

version 9.353-4 on a sophos 220 
 we have dhcp scopes set with the tick box "Clients with static mappings only" 
 we have hosts defined in definitions and userss >network defintions 
 the dhcp is giving out the ip addresses reserved for static hosts 
 so 2 problems 
 1. the rule static mappings only is not working 
 2. it is ignoring the static mappings also

BAlfson · Accepted Answer

Neil, unlike with Windows Server, the UTM's DHCP server does not make "reservations." You must make static assignments outside of the "Range" assigned dynamically by DHCP. Cheers - Bob

Jaydeep · Answer

Hi plecavalier 
 I agree with BAlfson here. Please read this article for Sophos UTM: DHCP Configuration and it clearly states: 
 Static Mappings 
 On the Network Services > DHCP > Static Mappings tab you can create static mappings between client and IP address for some or all clients. For that purpose, you need a configured DHCP server and, depending on the IP version of the DHCP server, the MAC address of the client's network card (with IPv4) or the DHCP Unique Identifier (DUID) of the client (with IPv6). 
 Note - To avoid an IP address clash between regularly assigned addresses from the DHCP pool and those statically mapped make sure that the latter are not in the scope of the DHCP pool. For example, a static mapping of 192.168.0.200 could result in two systems receiving the same IP address if the DHCP pool is 192.168.0.100 &ndash; 192.168.0.210. 
 Hope this helps.