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I can not add /31 subnet mask 255.255.255.254 in WAN ISP > static IP setting in VPN Firewall SRX5308
Hi, I can not add /31 subnet mask 255.255.255.254 in WAN ISP > static IP setting in VPN Firewall SRX5308. When I try to apply it, I get the error message popup as "Invalid IP subnet mask. Please enter 0/128/192/224/240/248/252 for octet 4". I am trying to add a fibre optic internet service from the provider's NTU into one of the 4 WAN settings. The provider gave me a /31 IP block and with the subnet mask as 255.255.255.254. Is this is a limitation in this firewall? Do I have to ask the provider to give me a /30 IP block instead? With /30 IP block the subnet mask will be 255.255.255.252 which is allowed by this firewall setting. I have tried this on a different firewall (SnapGear SG560) and it works without any issues. See the screenshots below. Can someone please help? regards Ridwan
