Re: NetworkManager, using two networks simultaneously

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On Fri, Jun 10, 2016 at 4:30 PM, Rick Stevens <ricks@xxxxxxxxxxxxxx> wrote:
> On 06/10/2016 03:07 PM, Chris Murphy wrote:
>>
>> On Fri, Jun 10, 2016 at 1:59 PM, Chris Murphy <lists@xxxxxxxxxxxxxxxxx>
>> wrote:
>>
>>> Clicking the Apply button does not reload the connections, so the
>>> settings change does not take effect. I either have to do 'nmcli c
>>> reload' or in the GUI click on Wired, then change On to Off to back
>>> On. And now it works as expected. GENERAL.DEFAULT is now no for this
>>> wired connection, and ip route show no longer shows it as default via.
>>>
>>> Sooo... if someone wants to test this on Fedora 23 in GNOME to see if
>>> this Apply bug happens there, it would be great to know if it's a
>>> regression or not, and note this in the bug.
>>>
>>> Thanks!
>>
>>
>>
>> OK I replicated this on the Fedora 23 Server NUC and oops, lost ssh
>> entirely. I think what's going on is since wireless is now default,
>> ssh comes up only on wireless and not on wired?
>
>
> I don't believe that's the case. Typically that stuff is dependent on
> if the _network_ (any network) is up or not, NOT what _kind_ of network
> it is. The problem is determining what runs (and when) based on network
> status is driven by the spectacularly over-complicated and broken
> systemd crapola. There might be something in there that breaks in these
> cases. It sure as h*ll wouldn't be the first time systemd was hosed or
> had race conditions.
>
> <soap>
> Using NM for anything headless is a bad idea. Using NM and DHCP for a
> headless unit is a REALLY bad idea. NM, DHCP and wireless for a
> headless unit is bordering on insanity. That's just my opinion, but I
> do manage a data center with about 300 servers and since I don't have
> time (nor the desire) to debug NM-related issues, I don't permit NM on
> them. We only use the old, reliable network script stuff. It's like an
> old VW Beetle...slow, ugly, noisy and smelly, but seems to always run.
> </soap>

It's all worked out in the end. Laptop and NUC use wireless for
internet only, and smb.conf and sshd_config restrict listening to the
wired network.

The biggest confusion was due to the F24 NetworkManger "Apply" bug.
That took hours to discover. And then the next most confusing one,
which was maybe 10 minutes worth was that the router had decided to
hand out a new ip right at the same time I made the changes on the F23
server. So now all the wired stuff is static.




-- 
Chris Murphy
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