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Changing the network configuration throught the WMC dashboard is not recommanded. Doing this through the local configuration is the good way since DNS configuration cannot be done through the dashboard.
For Wirnet Station, set new DNS and static IP assignment in /etc/sysconfig/network file (don't forget to set dhcp to 'n')
For KerOS systems (Wirnet iBTS, Wirnet iFemtoCell), you should issue a SSH connection to setup gateway IP assigment and DNS servers addresses.
Refer to the specific Wiki to setup static IP for your gateway:
Wirnet Station: http://wikikerlink.fr/lora-station/doku.php?id=wiki:faq#how_to_configure_static_ip_address
Wirnet iBTS: http://wikikerlink.fr/wirnet-ibts/doku.php?id=wiki:backhaul_3.3.3
Wirnet iFemtoCell: http://wikikerlink.fr/wirnet-ifemtocell/doku.php?id=wirnet-ifemtocell:network_3.4.4