On 08/06/2017 08:29 AM, Dick Steffens wrote:
> On 08/05/2017 11:56 PM, Russell Senior wrote:
>> "Dick" == Dick Steffens <d...@dicksteffens.com> writes:
>>
>> Dick> Two times over the last three days my machine has dropped its
>> Dick> Ethernet connection. It doesn't say it's dropped, but I can't see
>> Dick> beyond the machine, not even other machines in the house. Using
>> Dick> the widget on the top bar on the Ubuntu MATE 16.04 screen I
>> Dick> manually drop and then reconnect, and all is well again.
>>
>> Dick> I've never had this happen on other machines running various
>> Dick> versions of Ubuntu. Any ideas on where to look to see why the
>> Dick> connection is dropping?
>>
>> Do you still have a dhcp lease?  That is, is there a reasonable ip
>> address attached to the interface?  Do you have a link?  When you say
>> "dropped" does that mean to anywhere?  Do you have a default route?
>

Dropped again. Here are the results of ifconfig:

rsteff@ENU-2:~$ sudo ifconfig
[sudo] password for rsteff:
enp0s31f6 Link encap:Ethernet  HWaddr 70:8b:cd:7f:0c:56
           inet6 addr: fe80::aff0:732b:5508:6fb5/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:6750853 errors:0 dropped:0 overruns:0 frame:0
           TX packets:4152265 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:6321412070 (6.3 GB)  TX bytes:867072229 (867.0 MB)
           Interrupt:16 Memory:f7100000-f7120000

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:304784 errors:0 dropped:0 overruns:0 frame:0
           TX packets:304784 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:30561735 (30.5 MB)  TX bytes:30561735 (30.5 MB)

 From that I conclude that I don't have a dhcp lease. The lease is 
renewed by clicking on the Wired Connection 1 line in the drop down menu 
called Ethernet Network.

rsteff@ENU-2:~$ sudo ifconfig
enp0s31f6 Link encap:Ethernet  HWaddr 70:8b:cd:7f:0c:56
           inet addr:192.168.0.134  Bcast:192.168.0.255 Mask:255.255.255.0
           inet6 addr: fe80::aff0:732b:5508:6fb5/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:6752256 errors:0 dropped:0 overruns:0 frame:0
           TX packets:4153960 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:6321770679 (6.3 GB)  TX bytes:867335636 (867.3 MB)
           Interrupt:16 Memory:f7100000-f7120000

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:306131 errors:0 dropped:0 overruns:0 frame:0
           TX packets:306131 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:30680298 (30.6 MB)  TX bytes:30680298 (30.6 MB)

Using the Google FOO:

ubuntu MATE 16.04 loses dhcp lease

I found this:

https://superuser.com/questions/1087359/occasionally-losing-wired-lan-connection-on-ubuntu-16-04

I have to leave in a few minutes, but I'll pursue that further when I 
get back.

Thanks for the pointer to dhcp lease.

-- 
Regards,

Dick Steffens

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