set vpn l2tp remote-access outside-address '0.0.0.0'

log(info, binary-to-ascii(16, 8, ":", substring(option dhcp6.ia-pd, 24, 17)));

dhcpd[1568]: 40:20:1:ca:fe:11:11:ff:ff:0:0:0:0:0:0:0:0

frr-reload output:   0 /usr/lib/frr/frr-reload.py:851: SyntaxWarning: "is not" with a literal. Did you mean "!="?
frr-reload output:   1   if line is not "exit-vrf":
frr-reload output:   2 2021-11-02 18:33:34,225  INF

set vpn sstp authentication local-users username foo password 'bar'
set vpn sstp authentication local-users username foo2 password 'bar2'
set vpn sstp authentication mode 'local'
set vpn sstp client-ipv6-pool prefix 2001:db8::/48
set vpn sstp gateway-address '192.168.122.14'
set vpn sstp ppp-options ipv4 'deny'
set vpn sstp ppp-options ipv6 'allow'
set vpn sstp ssl ca-cert-file '/config/user-data/sstp/ca.crt'
set vpn sstp ssl cert-file '/config/user-data/sstp/server.crt'
set vpn sstp ssl key-file '/config/user-data/sstp/server.key'

vyos@r4-epa2:~$ show sstp-server s
sessions    statistics  
vyos@r4-epa2:~$ show sstp-server sessions 
ifname | username |          ip           |          ip6          | ip6-dp |   calling-sid   | rate-limit | state  |  uptime  | rx-bytes | tx-bytes 
--------+----------+-----------------------+-----------------------+--------+-----------------+------------+--------+----------+----------+----------
 sstp0  | foo2     | 2001:db8:0:0:200::/64 | 2001:db8:0:0:200::/64 |        | 192.168.122.222 |            | active | 00:00:09 | 735 B    | 506 B
vyos@r4-epa2:~$

vrf red
 vni 3000

vyos@r4-epa2:~$ generate openvpn key foo
Generating OpenVPN key to /config/auth/foo
Your new local OpenVPN key has been generated
vyos@r4-epa2:~$ 
vyos@r4-epa2:~$ ls -la /config/auth/
total 12
drwxrwsr-x 2 root vyattacfg 4096 Nov  2 09:00 .
drwxrwxr-x 7 root vyattacfg 4096 Nov  2 08:54 ..
-rw------- 1 root vyattacfg  636 Nov  2 09:00 foo
vyos@r4-epa2:~$