[Bug 1826760] [NEW] case where you do need to use ifupdown instead of netplan

[James No]

Public bug reported:

I have use the following config in the past to provide redundancy in the
event that someone resets the router to factory defaults ... this is no
longer possible in netplan.

```
auto enp9s0                                                             
iface enp9s0 inet dhcp                                                  
                                                                        
auto enp9s0:s                                                           
iface enp9s0:s inet static                                              
  address 192.168.4.2                                                   
  netmask 255.255.255.0                                                 
  gateway 192.168.4.1                                                   
  dns-nameservers 8.8.4.4 8.8.8.8                    
```

Specifically, I want to be able to configure 1x interface (only have one
physical eth on the box) to have both a static IP as well as be able to
accept a dynamic ip.  This setup allows for remote troubleshooting to
continue in the even that someone resets the ip range of the local
network which would normally kill network connectivity with a static IP.

** Affects: nplan (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1826760

Title:
  case where you do need to use ifupdown instead of  netplan

Status in nplan package in Ubuntu:
  New

Bug description:
  I have use the following config in the past to provide redundancy in
  the event that someone resets the router to factory defaults ... this
  is no longer possible in netplan.

  ```
  auto enp9s0                                                             
  iface enp9s0 inet dhcp                                                  
                                                                          
  auto enp9s0:s                                                           
  iface enp9s0:s inet static                                              
    address 192.168.4.2                                                   
    netmask 255.255.255.0                                                 
    gateway 192.168.4.1                                                   
    dns-nameservers 8.8.4.4 8.8.8.8                    
  ```

  Specifically, I want to be able to configure 1x interface (only have
  one physical eth on the box) to have both a static IP as well as be
  able to accept a dynamic ip.  This setup allows for remote
  troubleshooting to continue in the even that someone resets the ip
  range of the local network which would normally kill network
  connectivity with a static IP.

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