Ubuntu
network-manager package

DHCP settings for network manager shared connection are hard-coded source, should be editable

Bug #1098362 reported by John Thompson on 2013-01-10

This bug affects 20 people

Affects		Status	Importance	Assigned to	Milestone
	network-manager (Ubuntu)	Confirmed	Undecided	Unassigned

Bug Description

1) Ubuntu 10.04, but it's in all versions.
2) any version of network manager
3) I want to be able to change the DHCP settings for a shared network connection
4) YOUR OPERATING SYSTEM WON'T LET ME!

The file nm-device.c contains this line:

nm-device.c: guint32 start = (guint32) ntohl (0x0a2a2b01); /* 10.42.43.1 */

hard-coding DHCP settings that should obviously be editable by the user is a TERRIBLE IDEA. PLEASE FIX.

Revision history for this message

Thomas Hood (jdthood) wrote on 2013-01-14:

It's true. Looking at current NM src/nm-device.c line 1978:

  static guint32
  reserve_shared_ip (void)
  {
guint32 start = (guint32) ntohl (0x0a2a0001); /* 10.42.0.1 */
guint32 count = 0;

This is upstream source code. Please file a bug report upstream.

https://bugzilla.gnome.org/browse.cgi?product=NetworkManager

Changed in network-manager (Ubuntu):
status:	New → Invalid

Revision history for this message

Thomas Hood (jdthood) wrote on 2013-01-14:

To reduce administration, closed the report in Launchpad.

Thomas Hood (jdthood) on 2013-01-20

Changed in network-manager (Ubuntu):
status:	Invalid → New

Revision history for this message

Launchpad Janitor (janitor) wrote on 2013-01-20:

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in network-manager (Ubuntu):
status:	New → Confirmed

Revision history for this message

Raul (raulrm) wrote on 2014-02-26:

Other DHCP settings are fixed in code also. By example DHCP_TIMEOUT is fixed to 45 seconds. Terminals gaining ip leases thru radio links or vpn's aren't able to work with such short timeout.

Revision history for this message

ggallozz (ggallozz-gmail) wrote on 2016-12-31:

... and since 2013 nothing has gone further ?! :(

Revision history for this message

sdaau (sd-imi) wrote on 2017-01-16:

Ok, re-posted this bug upstream, at:

Bug 777313 - DHCP settings for network manager shared connection are hard-coded source, should be editable
https://bugzilla.gnome.org/show_bug.cgi?id=777313

Revision history for this message

sdaau (sd-imi) wrote on 2017-01-16:

Ah nice, here is what upstream has to say about this:

> Already fixed in nm-connection-editor:
>
> https://git.gnome.org/browse/network-manager-applet/commit/?id=e8a16438d8e3696d5e818d48bd49b9c1f284fd2c
>
> Note that before this commit it was already possible to manually modify the connection address using nmcli or editing the connection file to also change the DHCP pool served to clients.
>
> *** This bug has been marked as a duplicate of https://bugzilla.gnome.org/show_bug.cgi?id=763937 ***

The manual setting trick, from https://bugzilla.gnome.org/show_bug.cgi?id=763937 :

> Yes, that is a limitation in nm-connection-editor, which should probably be fixed. Which also means, it's non-obvious to the user that the range is configurable.
>
>
> Try for example:
>
> nmcli connection modify $CONNECTION_ID +ipv4.addresses 192.168.5.1/24
>
> where you can find $CONNECTION_ID via `nmcli connection show`
> Afterwards, verify with `nmcli connection show $CONNECTION_ID`
>