F21 - Refreshing DHCP lease on ethernet

[Robert Moskowitz]

On 01/22/2015 08:51 AM, poma wrote:
> On 21.01.2015 16:13, Robert Moskowitz wrote:
>> I am using ethernet to connect to a firewall I am configuring.  My
>> initial connection did not have any dhcp config info (because I had not
>> configured the server) like DNS servers and the like.  I have since
>> configed the firewall, but cannot get this information to my system.  I
> This should explain a "little" clearer.
>
>> tried:
>>
>> ifdown p6p1; ifup p6p1
>>
> $ rpm -qf $(which ifdown) $(which ifup)
> initscripts-9.56.1-6.fc21.x86_64
> initscripts-9.56.1-6.fc21.x86_64
>
> Should ask someone who actually uses this rather outdated method.
> Plus biosdevname, eh.
>
>> And that did not refresh the dhcp information.  I deleted the lease on
>> the firewall and bounced the ethernet with no changes. /etc/resolv still
>> does not have my DNS server addresses.
>>
>> With WiFi, I would have turned off the radio, turned it back on,
>> connected to my SSID and (normally) gotten the new lease info.
>>
>> BTW, this is a F21/Gnome setup (have not found the time to upgrade this
>> notebook to F22...)
>>
> Also, should ask someone who actually uses GNOME.
> Besides why do you refer to Fedora 22?

Sometimes I really wonder where my thoughts are.  This 'old' notebook is 
F20/Gnome.  It is scheduled to upgrade to F21/Xfce unless I start using 
it for F22 beta testing.

I am changing my ISP and struggling with their gateway and how to 
configure a real router/firewall behind it.  So my attention is divided 
in too many directions.  This ISP has seriously dumbed down their 
gateway and I keep hitting limitations.  Just this morning I figured out 
that if I implement virtual routers on MY router/firewall, I can fix 
most of the limitations I have encountered.  Perhaps after I get this 
figured out, I can sell it back to them!

I have 3 systems in testing:  One 'native' behind their firewall. One 
external (on my current ISP).  And one behind my firewall.  It is this 
one that keeps getting new settings as I test out different combinations 
where I am getting tired of not DHCP settings not getting updated.

It is past time for me to learn nmcli instead of using old methods like 
ifdown/ifup as you said.  I am right now reading various docs on nmcli.  
I suspect nmcli may replace my use of iwlist and other wireless commands 
I sometimes fall back on.

So back to reading up on nmcli.

And getting virtual router config working on my firewall.  Much of it is 
deciding what addressing structure I want to use as the addressing gets 
so buried in the firewall rules as to make address changes challenging.