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Here is what my /etc/network/interfaces looks like:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

However, if I use the GUI by...

  • clicking on the network connection near the clock,
  • clicking Edit Connections
  • selecting the only choice in the list (in my case wired connection 1)
  • picking Edit
  • picking the IPv4 tab

I see a static 192.168.1.96 with a netmask of 24 and a gateway of 192.168.1.2.

connection info and config in screenshot

  • First off, how is it possible I have a netmask of 24? Shouldn't it be 255,255,255,0?
  • Secondly, I no longer have any device at that gateway address (I did have till last week, but it is now gone) and my browser still works to get to the internet.`
  • Third, where is this information stored if not in the /etc/network/interfaces` file?

Just for completeness, here are the results of ifconfig:

$ ifconfig
enp2s2    Link encap:Ethernet  HWaddr 00:11:d8:39:2e:13
          inet addr:192.168.1.96  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::211:d8ff:fe39:2e13/64 Scope:Link
          inet6 addr: 2601:602:67f:f5c0:d0e2:7433:1cd5:d227/64 Scope:Global
          inet6 addr: 2601:602:67f:f5c0:211:d8ff:fe39:2e13/64 Scope:Global
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:720843 errors:0 dropped:361 overruns:0 frame:0
          TX packets:394690 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:254038082 (254.0 MB)  TX bytes:110719667 (110.7 MB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:999968 errors:0 dropped:0 overruns:0 frame:0
          TX packets:999968 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1
          RX bytes:323242248 (323.2 MB)  TX bytes:323242248 (323.2 MB)
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1 Answer 1

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  1. Netmask /24 is the same as 255.255.255.0 by another nomenclature
  2. Some one manually setup your IP address to 192.168.1.96 and the gateway to 192.168.1.2
  3. Try snooping into the directory /etc/network/interfaces.d/*
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  • O.K. I will research the /24 thingy. Yes, once upon a time I did set a static address. The /etc/network/interfaces.d directory is empty.
    – Cool Javelin
    Feb 19, 2018 at 19:01
  • It is now likely I won't know as I removed the static info from the GUI and I am able to set the IP via the router. Thanks for your help. @Stephen
    – Cool Javelin
    Feb 19, 2018 at 19:06

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