IPoE-server `network vlan` must not be used with `client-subnet`
```
set service ipoe-server authentication mode 'noauth'
set service ipoe-server interface eth1 client-subnet '100.64.204.0/24'
set service ipoe-server interface eth1 network 'vlan'
set service ipoe-server interface eth1 vlan '2000-2021'
```
It generates the next configuration:
```
vyos@r2# cat /run/accel-pppd/ipoe.conf | grep "\[ipoe" -A 10
[ipoe]
verbose=1
interface=re:^eth1\.(200\d|201\d|202[0-1])$,shared=0,mode=L2,ifcfg=1,range=100.64.204.0/24,start=dhcpv4,ipv6=1
vlan-mon=eth1,2000-2021
noauth=1
proxy-arp=1
```
`vlan-mon` means that VLANs (2000-2021) will be added dynamically and attached to `eth1` interface
But instead of using the shared network range for all VLANs it will generate a configuration that each VLAN uses separately and the same range 100.64.204.0/24
I.e
```
eth1.2000 range 100.64.204.0/24 (the first client gets address from 100.64.204.2)
eth2.2001 range 100.64.204.0/24 (the first client gets address from 100.64.204.2)
```
It causes the clients in different VLANs get the same IP addresses which is a wrong behavior
```
vyos@r2:~$ show ipoe-server sessions
ifname | username | calling-sid | ip | rate-limit | type | comp | state | uptime
-----------+----------+-------------------+--------------+------------+------+------+--------+----------
eth1.2004 | | 00:50:79:66:68:0c | 100.64.204.2 | | ipoe | | active | 00:00:22
eth1.2005 | | 00:50:79:66:68:0d | 100.64.204.2 | | ipoe | | active | 00:00:14
vyos@r2:~$
```
We need to disable such options in the `verify` section. And use named ip-polls instead. `set service ipoe-server client-ip-pool name`.