From: Fajar Priyanto <fajarpri at arinet.org> > Currently I have this network: > 10.1.16.0/22. > 10.1.16.0-10.16.17.254 are DHCP managed > 10.1.18.0-10.1.19.254 are statically assigned > If I need to expand it to: > 10.1.16.0/20 > 1. What is the best way to do it with minimal network disruption? I am no subneting pro but: Currently you have half DHCP and half statics... How will it be with the /20? Still half/half? $ ipcalc -nb 10.1.16.0/20 Address: 10.1.16.0 Netmask: 255.255.240.0 = 20 Wildcard: 0.0.15.255 => Network: 10.1.16.0/20 HostMin: 10.1.16.1 HostMax: 10.1.31.254 Broadcast: 10.1.31.255 Hosts/Net: 4094 A /20 half/half would give: 10.1.16.1-10.1.23.254 10.1.24.1-10.1.31.254 > 2. If I keep some machine with 22 subnet mask, will it still be able > to talk to the other machines in it's range? They would talk to 10.1.16.1-10.1.19.254 ones, but would go for the gateway for 10.1.20.1-10.1.31.254 JD