Re: NM VPN does not allow IPv6-only connections?

* Joel Goguen via networkmanager-list

When connecting to a VPN using NetworkManager (specifically tried using
OpenConnect but the bug looks to be in the NetworkManager core code) with IPv4
disabled, connecting fails. NetworkManager attempts to get an IPv4 configuration
anyway and fails if it isn't present.

On one VPN, with IPv4 disabled and no IPv4 DHCP in use, connecting failed
because no IPv4 config could be found. With the same VPN profile, IPv4 disabled,
but IPv4 addresses being handed out via DHCP, NetworkManager still looks for a
connection and configures IPv4 even though it's disabled.
I can confirm this bug on Fedora 29. If I set ipv4.method=disabled on an OpenVPN
connection profile (where the server offers both IPv4 and IPv6 addressing), NM
will ignore that and configure IPv4 anyway:

$ nmcli con show myvpn | egrep '^ipv4|IP4'
ipv4.method:                            disabled
ipv4.dns:                               --
ipv4.dns-search:                        --
ipv4.dns-options:                       ""
ipv4.dns-priority:                      0
ipv4.addresses:                         --
ipv4.gateway:                           --
ipv4.routes:                            --
ipv4.route-metric:                      -1
ipv4.route-table:                       0 (unspec)
ipv4.ignore-auto-routes:                no
ipv4.ignore-auto-dns:                   no
ipv4.dhcp-client-id:                    --
ipv4.dhcp-timeout:                      0 (default)
ipv4.dhcp-send-hostname:                yes
ipv4.dhcp-hostname:                     --
ipv4.dhcp-fqdn:                         --
ipv4.never-default:                     no
ipv4.may-fail:                          yes                       -1 (default)
IP4.ROUTE[1]:                           dst =, nh =, mt = 50
IP4.ROUTE[2]:                           dst =, nh =, mt = 50
IP4.ROUTE[3]:                           dst =, nh =, mt = 50
IP4.DNS[1]:                             <snip>
IP4.DOMAIN[1]:                          <snip>


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