Need help porting ifcfg-ppp0 config to NetworkManager

[David Howells <dhowells redhat com>]

Hi,

I need some help porting an ifcfg-ppp0 config from my old internet gateway
which was running to Fedora 16 to my new internet gateway which is running
F31.  Running "ifup ppp0" gives a message saying that this is deprecated and I
should switch to NM.

Unfortunately, I can't work out how to configure NM to do this.  I can see
options for connections of ppp, (a)dsl and pppoe type, but I seem to need some
combination of these and that does not appear to be possible to configure with
nmcli, plus some pppd options (such as "ipv6" and "holdoff") that aren't
listed in the documentation.

My (redacted) config is below.

Thanks,
David
---
[root@gatekeeper ~]# cat /etc/sysconfig/network-scripts/ifcfg-ppp0 
BOOTPROTO=dialup
DEFROUTE=yes
DEMAND=no
FIREWALL=NONE
ONBOOT=yes
PEERDNS=yes
PERSIST=yes
PIDFILE=/var/run/pppoe-adsl.pid
PING=.
SYNCHRONOUS=no
TYPE=xDSL
USERCTL=yes

CONNECT_POLL=6
CONNECT_TIMEOUT=3600
DEVICE=ppp0
ETH=enp4s0
IPV6INIT=yes
LCP_FAILURE=120
LCP_INTERVAL=1
LINUX_PLUGIN=rp-pppoe.so
MRU=1492
MTU=1492
PPPOE_TIMEOUT=80

PPPD_EXTRA="ipv6 <local-ipv6-addr>,<peer-ipv6-addr> holdoff 1"
IPADDR=<my-ip-addr>
USER=<my-user-name>