... DDNS service.12:Port mapping, DMZ host function.13: Support VPN,PPTP client,L2TP client.Application:Electronics, Oil industry, Mineral, ... ~ +80°CHumidity: 5%~95%,No condensation270 serial Industrial lte vpn routerT270 serial is a high-performance, upgradeable, industrial-grade 3G ... service.12:Port mapping, DMZ host function.13: Support VPN,PPTP client,L2TP client.14: support client-side advertisement ...