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Groups > linux.debian.user > #275004 > unrolled thread

How to create a persistent loopback address

Started byTimothy M Butterworth <timothy.m.butterworth@gmail.com>
First post2024-11-30 08:30 +0100
Last post2024-11-30 20:20 +0100
Articles 12 — 3 participants

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  How to create a persistent loopback address Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2024-11-30 08:30 +0100
    Re: How to create a persistent loopback address john doe <johndoe65534@mail.com> - 2024-11-30 14:10 +0100
    Re: How to create a persistent loopback address Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2024-11-30 19:50 +0100
      Re: How to create a persistent loopback address Andy Smith <andy@strugglers.net> - 2024-11-30 20:10 +0100
        Re: How to create a persistent loopback address john doe <johndoe65534@mail.com> - 2024-11-30 20:20 +0100
          Re: How to create a persistent loopback address john doe <johndoe65534@mail.com> - 2024-11-30 20:30 +0100
            Re: How to create a persistent loopback address Andy Smith <andy@strugglers.net> - 2024-11-30 20:40 +0100
              Re: How to create a persistent loopback address Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2024-12-01 02:20 +0100
        Re: How to create a persistent loopback address Andy Smith <andy@strugglers.net> - 2024-11-30 20:20 +0100
          Re: How to create a persistent loopback address Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2024-12-01 01:10 +0100
      Re: How to create a persistent loopback address Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2024-11-30 20:20 +0100
        Re: How to create a persistent loopback address Andy Smith <andy@strugglers.net> - 2024-11-30 20:20 +0100

#275004 — How to create a persistent loopback address

FromTimothy M Butterworth <timothy.m.butterworth@gmail.com>
Date2024-11-30 08:30 +0100
SubjectHow to create a persistent loopback address
Message-ID<JOq5r-cHKq-1@gated-at.bofh.it>

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Hello,

I created a loopback interface with the following commands:

sudo ip link add name ospf-lo type dummy
sudo ip link set ospf-lo up
sudo ip addr add 10.0.0.1/32 dev ospf-lo

How do I make this interface persistent? I am on Debian Trixie and using
NetworkManager.

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#275012

Fromjohn doe <johndoe65534@mail.com>
Date2024-11-30 14:10 +0100
Message-ID<JOvot-cLN1-7@gated-at.bofh.it>
In reply to#275004
On 11/30/24 08:22, Timothy M Butterworth wrote:
> I created a loopback interface with the following commands:
>
> sudo ip link add name ospf-lo type dummy
> sudo ip link set ospf-lo up
> sudo ip addr add 10.0.0.1/32 dev ospf-lo
>
> How do I make this interface persistent? I am on Debian Trixie and using
> NetworkManager.
>

By using NM ([1]) and googling to manage the dummy interface.

[1]
https://unix.stackexchange.com/questions/513578/modern-way-to-configure-dummy0-in-etc-network-interfaces-or-similar

--
John Doe

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#275035

FromTimothy M Butterworth <timothy.m.butterworth@gmail.com>
Date2024-11-30 19:50 +0100
Message-ID<JOAHv-cOR4-7@gated-at.bofh.it>
In reply to#275004

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On Sat, Nov 30, 2024 at 2:22 AM Timothy M Butterworth <
timothy.m.butterworth@gmail.com> wrote:

> Hello,
>
> I created a loopback interface with the following commands:
>
> sudo ip link add name ospf-lo type dummy
> sudo ip link set ospf-lo up
> sudo ip addr add 10.0.0.1/32 dev ospf-lo
>
> How do I make this interface persistent? I am on Debian Trixie and using
> NetworkManager.
>

I tried the following but no success.

sudo touch /etc/network/interfaces.d/ospf.cf
sudo vim /etc/network/interfaces.d/ospf.cf

auto ospf

iface ospf inet static
  address 10.0.0.1
  netmask 255.255.255.255

-- 
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⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system
⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org/
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#275038

FromAndy Smith <andy@strugglers.net>
Date2024-11-30 20:10 +0100
Message-ID<JOB0S-cPdg-9@gated-at.bofh.it>
In reply to#275035
Hi,

On Sat, Nov 30, 2024 at 01:47:42PM -0500, Timothy M Butterworth wrote:
> On Sat, Nov 30, 2024 at 2:22 AM Timothy M Butterworth <
> timothy.m.butterworth@gmail.com> wrote:
> > sudo ip link add name ospf-lo type dummy
> > sudo ip link set ospf-lo up
> > sudo ip addr add 10.0.0.1/32 dev ospf-lo
> >
> > How do I make this interface persistent? I am on Debian Trixie and using
> > NetworkManager.
> 
> I tried the following but no success.

Surely if you are using NetworkManager you would just do it with nmcli.
I can't recite the incantations off the top of my head but I imagine
that creating a new interface is pretty simple.

Thanks,
Andy

-- 
https://bitfolk.com/ -- No-nonsense VPS hosting

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#275042

Fromjohn doe <johndoe65534@mail.com>
Date2024-11-30 20:20 +0100
Message-ID<JOBax-cPgt-9@gated-at.bofh.it>
In reply to#275038
On 11/30/24 20:04, Andy Smith wrote:
> Hi,
>
> On Sat, Nov 30, 2024 at 01:47:42PM -0500, Timothy M Butterworth wrote:
>> On Sat, Nov 30, 2024 at 2:22 AM Timothy M Butterworth <
>> timothy.m.butterworth@gmail.com> wrote:
>>> sudo ip link add name ospf-lo type dummy
>>> sudo ip link set ospf-lo up
>>> sudo ip addr add 10.0.0.1/32 dev ospf-lo
>>>
>>> How do I make this interface persistent? I am on Debian Trixie and using
>>> NetworkManager.
>>
>> I tried the following but no success.
>
> Surely if you are using NetworkManager you would just do it with nmcli.
> I can't recite the incantations off the top of my head but I imagine
> that creating a new interface is pretty simple.
>
>

Not sure what the OP is trying to do here [1].

--
John Doe

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#275044

Fromjohn doe <johndoe65534@mail.com>
Date2024-11-30 20:30 +0100
Message-ID<JOBke-cPjt-5@gated-at.bofh.it>
In reply to#275042
On 11/30/24 20:11, john doe wrote:
> On 11/30/24 20:04, Andy Smith wrote:
>> Hi,
>>
>> On Sat, Nov 30, 2024 at 01:47:42PM -0500, Timothy M Butterworth wrote:
>>> On Sat, Nov 30, 2024 at 2:22 AM Timothy M Butterworth <
>>> timothy.m.butterworth@gmail.com> wrote:
>>>> sudo ip link add name ospf-lo type dummy
>>>> sudo ip link set ospf-lo up
>>>> sudo ip addr add 10.0.0.1/32 dev ospf-lo
>>>>
>>>> How do I make this interface persistent? I am on Debian Trixie and
>>>> using
>>>> NetworkManager.
>>>
>>> I tried the following but no success.
>>
>> Surely if you are using NetworkManager you would just do it with nmcli.
>> I can't recite the incantations off the top of my head but I imagine
>> that creating a new interface is pretty simple.
>>
>>
>
> Not sure what the OP is trying to do here [1].
>

[1]  https://lists.debian.org/debian-user/2024/11/msg00827.html

Sorry for forgetting the URL.

--
John Doe

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#275045

FromAndy Smith <andy@strugglers.net>
Date2024-11-30 20:40 +0100
Message-ID<JOBtT-cPmy-5@gated-at.bofh.it>
In reply to#275044
Hi,

On Sat, Nov 30, 2024 at 08:25:31PM +0100, john doe wrote:
> On 11/30/24 20:11, john doe wrote:
> > Not sure what the OP is trying to do here [1].
> 
> [1]  https://lists.debian.org/debian-user/2024/11/msg00827.html

Yes, I too was confused why they had ignored your advice (to use nmcli).
I was more asking in the hope they would elaborate, but so far we see
only ifupdown.

Thanks,
Andy

-- 
https://bitfolk.com/ -- No-nonsense VPS hosting

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#275077

FromTimothy M Butterworth <timothy.m.butterworth@gmail.com>
Date2024-12-01 02:20 +0100
Message-ID<JOGMW-cSLq-5@gated-at.bofh.it>
In reply to#275045

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On Sat, Nov 30, 2024 at 7:57 PM Andy Smith <andy@strugglers.net> wrote:

> Hi,
>
> On Sat, Nov 30, 2024 at 08:25:31PM +0100, john doe wrote:
> > On 11/30/24 20:11, john doe wrote:
> > > Not sure what the OP is trying to do here [1].
> >
> > [1]  https://lists.debian.org/debian-user/2024/11/msg00827.html
>
> Yes, I too was confused why they had ignored your advice (to use nmcli).
> I was more asking in the hope they would elaborate, but so far we see
> only ifupdown.
>

Here is the nmcli syntax for the dummy interface. I tested it and it is
persistent.
sudo nmcli conn add type dummy ifname ospf ipv4.method manual ipv4.address
10.0.0.1/32

Right now I am reading up on systemd-networkd. I figure I might as well
build out all three configuration types.

Thanks,
> Andy
>
> --
> https://bitfolk.com/ -- No-nonsense VPS hosting
>
>

-- 
⢀⣴⠾⠻⢶⣦⠀
⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system
⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org/
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#275043

FromAndy Smith <andy@strugglers.net>
Date2024-11-30 20:20 +0100
Message-ID<JOBax-cPgt-11@gated-at.bofh.it>
In reply to#275038
On Sat, Nov 30, 2024 at 07:04:22PM +0000, Andy Smith wrote:
> Surely if you are using NetworkManager you would just do it with nmcli.
> I can't recite the incantations off the top of my head but I imagine
> that creating a new interface is pretty simple.

My first web search led me to:

$ sudo nmcli conn add \
    type dummy \
    ifname ospf-lo \
    ipv4.method manual \
    ipv4.address 10.0.0.1/32 \
    ipv6.method disable
Connection 'dummy-ospf-lo' (c21bdb21-375f-484b-9c7e-4d088c139fc3) successfully added.
$ ip a sh dev ospf-lo
6: ospf-lo: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
    link/ether 42:39:23:bd:ab:e1 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.1/32 scope global noprefixroute ospf-lo
       valid_lft forever preferred_lft forever

Thanks,
Andy

-- 
https://bitfolk.com/ -- No-nonsense VPS hosting

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#275069

FromTimothy M Butterworth <timothy.m.butterworth@gmail.com>
Date2024-12-01 01:10 +0100
Message-ID<JOFHb-cS8R-1@gated-at.bofh.it>
In reply to#275043

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On Sat, Nov 30, 2024 at 6:57 PM Andy Smith <andy@strugglers.net> wrote:

> On Sat, Nov 30, 2024 at 07:04:22PM +0000, Andy Smith wrote:
> > Surely if you are using NetworkManager you would just do it with nmcli.
> > I can't recite the incantations off the top of my head but I imagine
> > that creating a new interface is pretty simple.
>
> My first web search led me to:
>
> $ sudo nmcli conn add \
>     type dummy \
>     ifname ospf-lo \
>     ipv4.method manual \
>     ipv4.address 10.0.0.1/32 \
>     ipv6.method disable
> Connection 'dummy-ospf-lo' (c21bdb21-375f-484b-9c7e-4d088c139fc3)
> successfully added.
> $ ip a sh dev ospf-lo
> 6: ospf-lo: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state
> UNKNOWN group default qlen 1000
>     link/ether 42:39:23:bd:ab:e1 brd ff:ff:ff:ff:ff:ff
>     inet 10.0.0.1/32 scope global noprefixroute ospf-lo
>        valid_lft forever preferred_lft forever
>

Andy, thanks for the info. I decided to scrap NM and just use ifup.

thanks
Tim




> Thanks,
> Andy
>
> --
> https://bitfolk.com/ -- No-nonsense VPS hosting
>
>

-- 
⢀⣴⠾⠻⢶⣦⠀
⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system
⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org/
⠈⠳⣄⠀⠀

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#275040

FromTimothy M Butterworth <timothy.m.butterworth@gmail.com>
Date2024-11-30 20:20 +0100
Message-ID<JOBax-cPgt-5@gated-at.bofh.it>
In reply to#275035

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On Sat, Nov 30, 2024 at 1:47 PM Timothy M Butterworth <
timothy.m.butterworth@gmail.com> wrote:

>
>
> On Sat, Nov 30, 2024 at 2:22 AM Timothy M Butterworth <
> timothy.m.butterworth@gmail.com> wrote:
>
>> Hello,
>>
>> I created a loopback interface with the following commands:
>>
>> sudo ip link add name ospf-lo type dummy
>> sudo ip link set ospf-lo up
>> sudo ip addr add 10.0.0.1/32 dev ospf-lo
>>
>> How do I make this interface persistent? I am on Debian Trixie and using
>> NetworkManager.
>>
>
> I tried the following but no success.
>
> sudo touch /etc/network/interfaces.d/ospf.cf
> sudo vim /etc/network/interfaces.d/ospf.cf
>
> auto ospf
>
> iface ospf inet static
>   address 10.0.0.1
>   netmask 255.255.255.255
>

 I got it to work with:
sudo cat /etc/network/interfaces.d/ospf.cfg
auto ospf
iface ospf inet static
  address 10.0.0.1/32
  pre-up ip link add ospf type dummy



-- 
⢀⣴⠾⠻⢶⣦⠀
⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system
⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org/
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#275041

FromAndy Smith <andy@strugglers.net>
Date2024-11-30 20:20 +0100
Message-ID<JOBax-cPgt-7@gated-at.bofh.it>
In reply to#275040
Hi,

On Sat, Nov 30, 2024 at 02:10:58PM -0500, Timothy M Butterworth wrote:
> > On Sat, Nov 30, 2024 at 2:22 AM Timothy M Butterworth <
> > timothy.m.butterworth@gmail.com> wrote:
> >> How do I make this interface persistent? I am on Debian Trixie and using
> >> NetworkManager.

>  I got it to work with:
> sudo cat /etc/network/interfaces.d/ospf.cfg
> auto ospf
> iface ospf inet static
>   address 10.0.0.1/32
>   pre-up ip link add ospf type dummy

I personally would not use ifupdown config files on a system that was
managed with NetworkManager unless absolutely necessary. It just seems
confusing for whichever admin comes next, such as me one week later.

Thanks,
Andy

-- 
https://bitfolk.com/ -- No-nonsense VPS hosting

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