Openvpn ios client problem

hello all,

i recently installed openvpn on a Mt CHR router..
Connections with other MT routers are ok.. Connections with macosx using Tunnelblick are ok..
I have some problems using Ios, in my ipad..
Log file on the OpenVpn client on iOs, says:

2018-07-25 14:54:40 SSL Handshake: TLSv1.2/TLS-DHE-RSA-WITH-AES-256-GCM-SHA384
2018-07-25 14:54:40 Session is ACTIVE
2018-07-25 14:54:40 EVENT: GET_CONFIG
2018-07-25 14:54:40 Sending PUSH_REQUEST to server...
2018-07-25 14:54:41 Sending PUSH_REQUEST to server...
2018-07-25 14:54:43 Sending PUSH_REQUEST to server...
2018-07-25 14:54:43 OPTIONS:
0 [redirect-gateway] [def1]
1 [dhcp-option] [DOMAIN] [xxxxxx.com]
2 [dhcp-option] [DNS] [8.8.8.8]
3 [ping] [20]
4 [ping-restart] [60]
5 [topology] [p2p]
6 [ifconfig] [10.254.251.12] [10.254.251.1]

and a few lines later:

2018-07-25 14:54:43 EVENT: ASSIGN_IP
2018-07-25 14:54:43 NIP: preparing TUN network settings
2018-07-25 14:54:43 NIP: init TUN network settings with endpoint: 108.61.190.7
2018-07-25 14:54:43 Client exception in transport_recv: option_error: only topology 'subnet' and 'net30' supported
2018-07-25 14:54:43 Client terminated, restarting in 2000 ms...

where should i add this “topology subnet” ?

thank you very much in advance,


George