On Wed, Feb 07, 2018 at 10:02:18AM +0200, Michelle Konzack wrote:
However, the lead to the problem, that I need more then 256 IP addresses and since I do not want to install my own Linux router behind my 3G Gateway only to have 512 IP adresses or more, I decided to increaase the network with 255.255.127.0. and if the IP is e.g. 192.168.4.12, then the IP range become automatically 192.168.4.0-192.168.5.255.
As someone already pointed out, this is a bogus netmask. I recommend sipcalc as a handy tool for figuring out network information:
sipcalc 192.168.4.0/23
-[ipv4 : 192.168.4.0/23] - 0 [CIDR] Host address - 192.168.4.0 Host address (decimal) - 3232236544 Host address (hex) - C0A80400 Network address - 192.168.4.0 Network mask - 255.255.254.0 Network mask (bits) - 23 Network mask (hex) - FFFFFE00 Broadcast address - 192.168.5.255 Cisco wildcard - 0.0.1.255 Addresses in network - 512 Network range - 192.168.4.0 - 192.168.5.255 Usable range - 192.168.4.1 - 192.168.5.254
sipcalc -4 "192.168.4.0 255.255.127.0"
-[ipv4 : 192.168.4.0 255.255.127.0] - 0 -[ERR : Invalid netmask]
sipcalc -4 "192.168.4.0 255.255.128.0"
-[ipv4 : 192.168.4.0 255.255.128.0] - 0 [CIDR] Host address - 192.168.4.0 Host address (decimal) - 3232236544 Host address (hex) - C0A80400 Network address - 192.168.0.0 Network mask - 255.255.128.0 Network mask (bits) - 17 Network mask (hex) - FFFF8000 Broadcast address - 192.168.127.255 Cisco wildcard - 0.0.127.255 Addresses in network - 32768 Network range - 192.168.0.0 - 192.168.127.255 Usable range - 192.168.0.1 - 192.168.127.254
