[Dnsmasq-discuss] OT client q: both static and dhcp

[Carl Karsten]

On Sun, Jun 27, 2021 at 12:17 PM Andrew Miskell <andrewmiskell at mac.com>
wrote:

>
>
> On Jun 27, 2021, at 12:02, Carl Karsten <carl at nextdayvideo.com> wrote:
>
> 
>
>
> On Sun, Jun 27, 2021 at 10:49 AM Andrew Miskell <andrewmiskell at mac.com>
> wrote:
>
>>
>>
>> On Jun 27, 2021, at 09:30, Carl Karsten <carl at nextdayvideo.com> wrote:
>>
>> 
>>
>>
>> On Sun, Jun 27, 2021 at 7:56 AM john doe <johndoe65534 at mail.com> wrote:
>>
>>> On 6/27/2021 9:17 AM, Carl Karsten wrote:
>>> > On Sun, Jun 27, 2021 at 2:10 AM john doe <johndoe65534 at mail.com>
>>> wrote:
>>> >
>>> >> On 6/27/2021 7:03 AM, Dominik wrote:
>>> >>> Hey Carl,
>>> >>>
>>> >>> On Sat, 2021-06-26 at 19:16 -0500, Carl Karsten wrote:
>>> >>>> I'm looking for advice on haveing some boxes to have both dynamic
>>> and
>>> >>>> static IPs.
>>> >>>
>>> >>> Why use a static IP at all? We have often enough seen people use
>>> static
>>> >>> addresses for the wrong reasons.
>>> >>>
>>> >>
>>> >> As I understand it, the OP wants to use DHCP static leases.
>>> >>
>>> >
>>> > No.
>>> >
>>> > I need this for when move put a box on someone else's network.
>>> > So I don't have any control over the dhcp server.
>>> >
>>>
>>> Then set an fix IP on dhcp client (dhclient ...) and remove it when you
>>> don't need it.
>>>
>>> Basically, you set the dhcp client to have a static address or let the
>>> client get a lease from a dhcp server.
>>>
>>
>> I'm trying to reduce the amount of work I need to do when I show up and
>> discover there is no dhcp server.
>>
>> Example locations: university, coffee shop, convention center, office
>> meeting room.   In all cases I am a guest for a few days.
>>
>>
>>
>>>
>>> Why do you need dnsmasq into the mix?
>>>
>>
>> I don't - I am just working on client config.
>>
>>
>>
>>>
>>> --
>>> John Doe
>>>
>>> _______________________________________________
>>> Dnsmasq-discuss mailing list
>>> Dnsmasq-discuss at lists.thekelleys.org.uk
>>> https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
>>>
>>
>>
>> --
>> Carl K
>> _______________________________________________
>> Dnsmasq-discuss mailing list
>> Dnsmasq-discuss at lists.thekelleys.org.uk
>> https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
>>
>>
>> A couple things. It might help to state what the client device is running
>> (Windows, Linux and what distribution/version).
>>
>>
> Opsis PC: Ubuntu 20.04.2 LTS
> Voctomix:  Debian GNU/Linux 11
>
>
>
>> dnsmasq is a DNS/DHCP server not a client, so I’m unsure what the role of
>> dnsmasq would be here.
>>
>>
> This is a bit OT (Off Topic) as in it is not a dnsmasq server question.
> I am asking about client config.
> to a group qualified to know about such things.
> if there is a better place to ask such questions, let me know.
>
>
>
>> Most of the places you listed would already have a DHCP server available
>> to hand out IP addresses (and associated network information) on its own.
>> Otherwise, there’s no easy way to connect to the internet without knowing
>> all that particular networks details (e.g. gateway address, subnet mask,
>> etc, etc) which defeats the point of providing network access in a number
>> of the locations you listed.
>>
>
> If I could always plug a wire into a jack and get to a dhcp server, I
> would not have a problem.
> I do not want to route 400mbs video traffic though the coffee shop wifi.
> Which isn't a problem as my devices don't have wifi.  So yes the coffee
> shop does have a dhcp server, I may not want to use it.
>
> If I do not have access to the venue network, then my networking needs are
> just my 2 devices.  This is the  case I am trying to provide for, without
> having to edit
> a config file.  the Opsis PC is often headless,  so editing is done via
> ssh from the voctomix pc, which is hard if the 2 don't have networking
> setup.
>
> --
> Carl K
>
>
> If you are using NetworkManager for configuring your interfaces on those
> linux machines, you can have two profiles bound to the same interface with
> the dhcp profile having a higher priority over the static profile. So if
> DHCP fails, the static profile takes over.
>
>
That sounds like I won't have both static and dhcp IPs at the same time?


> Ubuntu switched to NetPlan sometime back and I’m not sure if it has the
> same options, you’d have the check netplan’s documentation.
>

I seem to remember working this out for NetPlan and being happy with how
simple the .conf was.   That was about 2 years ago and I'm not sure if it
worked.


-- 
Carl K
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