vyos@vyos# run show config comm | grep fire
set firewall name FOO rule 10 action 'accept'
set firewall name FOO rule 10 protocol 'tcp'
set firewall name FOO rule 10 tcp flags not ack
set firewall name FOO rule 10 tcp flags syn
set firewall name FOO rule 40 action 'accept'
set firewall name FOO rule 40 protocol '!gre'
[edit]
vyos@vyos# sudo nft list chain ip filter NAME_FOO
table ip filter {
	chain NAME_FOO {
		tcp flags & (syn | ack) == syn counter packets 0 bytes 0 return comment "FOO-10"
		meta l4proto != gre counter packets 0 bytes 0 return comment "FOO-40"
		counter packets 0 bytes 0 return comment "FOO default-action accept"
	}
}

set interfaces ethernet eth0 address 'dhcpv6'
set interfaces ethernet eth0 dhcpv6-options pd 0 interface eth1 address '1'
set interfaces ethernet eth0 dhcpv6-options pd 0 interface eth1 sla-id '0'
set interfaces ethernet eth0 dhcpv6-options pd 0 length '64'

vyos@vyos# run show dhcpv6 server leases 
Traceback (most recent call last):
  File "/usr/libexec/vyos/op_mode/show_dhcpv6.py", line 209, in <module>
    leases = get_leases(conf, lease_file, args.state, args.pool, args.sort)
  File "/usr/libexec/vyos/op_mode/show_dhcpv6.py", line 142, in get_leases
    leases = sorted(leases, key = lambda k: int(ip_address(k['ip'])))
  File "/usr/libexec/vyos/op_mode/show_dhcpv6.py", line 142, in <lambda>
    leases = sorted(leases, key = lambda k: int(ip_address(k['ip'])))
  File "/usr/lib/python3.7/ipaddress.py", line 54, in ip_address
    address)
ValueError: '2001:db8:290::/64' does not appear to be an IPv4 or IPv6 address

vyos@vyos# run show version | match Version
Version:          VyOS 1.3.0
[edit]
vyos@vyos# run show dhcpv6 server leases 
IPv6 address        State    Last communication    Lease expiration     Remaining    Type           Pool         IAID_DUID
------------------  -------  --------------------  -------------------  -----------  -------------  -----------  -----------------------------------------------------------------
2001:db8:3456::187  active   2022/02/15 09:28:10   2022/02/15 21:28:10  11:58:28     non-temporary  VyOS-DHCPv6  00:00:00:00:00:04:79:76:62:99:23:ad:43:fb:9c:5b:1c:1e:59:4b:58:01

sudo rm /etc/systemd/system/conntrackd.service.d/override.conf

conntrack-tools[5097]: udp      17 src=100.64.0.3 dst=1.1.1.1 sport=41900 dport=53 src=1.1.1.1 dst=198.51.100.1 sport=53 dport=41900

vyos@r11-roll# run show conf com | match test
set system static-host-mapping host-name test1.com inet '1.1.1.1'
set system static-host-mapping host-name test2.com inet '2a00:1450:400f:802::200e'