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Changing the network configuration through the WMC dashboard is not recommended. Doing this through the local configuration is the good way since DNS configuration cannot be done through the dashboard.
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#ethernet_configuration
Wirnet iFemtoCell: http://wikikerlink.fr/wirnet-ifemtocell/doku.php?id=wirnet-ifemtocell:network_3.4.4#ethernet_configuration