I'm trying to setup a static IP on an interface in Ubuntu 16.04. It's for a local connection with no DHCP server or DNS configuration. I've tried doing it from the Edit Connections GUI as well as from the CLI and am not having much luck.
I've searched around and found several similar questions (Set static IP Ubuntu 16.04, etc), but cannot seem to get the right setup myself.
Here is where I am at... There are currently three devices connected to a switch. One configured at 1.51, one at 1.20, and this 16.04 system I'm trying to configure for 1.49. Both 51 and 20 are communicating fine. I've switched out cables and tried different ports... so I know it's not a physical issue. And, in fact, one of the other systems on this switch is an Ubuntu 14.04 with an interface setup identically, but the IP is 51. The only problem here appears to be the Ubuntu 16.04 system.
16.04 /etc/network/interfaces file:
# interfaces(5) file used by ifup(8) and ifdown(8) # The loopback network interface auto lo iface lo inet loopback # Primary network interface auto enp4s0 #iface enp4s0 inet dhcp iface enp4s0 inet static address 192.168.1.49 netmask 255.255.255.0 gateway 192.168.1.1 $ ifconfig enp4s0 Link encap:Ethernet HWaddr f4:8e:38:e7:39:31 inet addr:192.168.1.49 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::f68e:38ff:fee7:3931/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:258 errors:0 dropped:0 overruns:0 frame:0 TX packets:2123 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:28821 (28.8 KB) TX bytes:208448 (208.4 KB)
Everything looks fine. But pings fail. Can't ping in or out. The most interesting thing to me is the netmask when looking at the interface from the GUI. If I go to "Edit Connections..." from the network icon on the top right and edit this interface, it shows the following:
Address: 192.168.1.49 Netmask: 24 Gateway: 192.168.1.1
A netmask of "24"? That doesn't make any sense... but things look fine from ifconfig from the CLI.
I'm out of ideas. Should be simple...?
Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.1.1 0.0.0.0 UG 100 0 0 enp4s0 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 enp4s0 192.168.1.0 0.0.0.0 255.255.255.0 U 100 0 0 enp4s0