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Changing the network configuration through the WMC dashboard is not recommended since DNS configuration cannot be achieved.
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