Very slow IP communication, if no Internet connect

If I use on segmented network, where no Internet connection, the VS-GV1202-4G is not answer my TCP/IP requests.

Model Name: EGW200
GSM Modem Description: GSM:850/900/1800/1900MHz
Software Version: 2.1.3
Hardware Version: Date 2012-11-09 FPGA 11 Hardware 00

hi, can you login the web interface of gsm gateway when there is no internet connection?

We have a LAN, without Internet router, and TCP/IP gateway. We want use the GSM gateway on this LAN for the outgoing GSM calls.
Sometime can login, sometime can't login to the web interface, because wrong IP communication without Internet connection.

hi. Do you mean connect to public network directly? It seems like a network config issue. how do you set the network configuration?

We don't have public network on this place. Don't have Internet connection on this place. Only 4 PC in one LAN, and GSM Gateway.

Network parameters:
IP: 192.168.82.201
Mask: 255.255.255.0
Gateway: empty
DNS: empty

no router, no switch, is it a LAN with Ring Topology? this communication delay issue should cause by your network.