admin@vyos-lns-1:~$ show config commands |grep firewall
set firewall interface l2tp* out name 'nodefw'
set firewall log-martians 'disable'
set firewall name nodefw rule 100 action 'accept'
set firewall name nodefw rule 100 protocol 'tcp'
set firewall name nodefw rule 100 tcp flags syn
set firewall name nodefw rule 100 tcp mss '1300'

set firewall interface

sudo nano -c +253 /usr/libexec/vyos/conf_mode/vpn_openconnect.py

call('systemctl restart ocserv.service')

call('systemctl reload-or-restart ocserv.service')

set firewall interface l2tp* out name 'FOO'
set firewall name FOO rule 10 action 'accept'
set firewall name FOO rule 10 protocol 'tcp'
set firewall name FOO rule 10 tcp flags syn
set firewall name FOO rule 10 tcp mss '1300'

table ip vyos_filter {
	chain VYOS_FW_FORWARD {
		type filter hook forward priority filter; policy accept;
		oifname "l2tp*" counter packets 0 bytes 0 jump NAME_FOO
		jump VYOS_POST_FW
	}
...
	chain NAME_FOO {
		tcp flags & syn == syn tcp option maxseg size 1300 counter packets 0 bytes 0 return comment "FOO-10"
		counter packets 0 bytes 0 drop comment "FOO default-action drop"
	}
}

vyos@r1# set service snmp oid-enable 
Possible completions:
   route-table          Enable routing table OIDs (ipCidrRouteTable inetCidrRouteTable)

set interfaces virtual-ethernet veth0 peer-name 'veth1'
set interfaces virtual-ethernet veth1 peer-name 'veth0'
set interfaces virtual-ethernet veth12 peer-name 'veth0'
commit

vyos@r1# commit
[ interfaces virtual-ethernet veth12 ]
{'ifname': 'veth12',
 'other_interfaces': {'veth0': {'peer_name': 'veth1'},
                      'veth1': {'peer_name': 'veth0'},
                      'veth12': {'peer_name': 'veth0'}},
 'peer_name': 'veth0'}
VyOS had an issue completing a command.