On 07/02/18 08:07, Brian wrote: > netmask and network are not needed. ifupdown will compute them. Note > there are no examples in interfaces(5) which use these parameters. The examples use CIDR notation instead, eg "address 192.168.1.1/24". The netmask line is an alternative to that. You need to tell it _somehow_ how big the subnet is. Richard
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