VoIP
The SIP ALG (Application Layer Gateway) acts as a proxy for SIP communication. For SIP calls the ALG opens the necessary ports on the firewall for
the corresponding media packets. By using automatic address translation for devices inside the LAN, the use of STUN is no longer needed.
SIP ALG
Routing functions
IP and NetBIOS/IP multi-protocol routerRouter
Separate processing of 16 contexts due to virtualization of the routers. Mapping to VLANs and complete independent management and configuration
of IP networks in the device, i.e. individual settings for DHCP, DNS, Firewalling, QoS, VLAN, Routing etc. Automatic learning of routing tags for
ARF contexts from the routing table
Advanced Routing and Forwarding
HTTP and HTTPS server for configuration by web interfaceHTTP
DNS client, DNS server, DNS relay, DNS proxy and dynamic DNS clientDNS
DHCP client, DHCP relay and DHCP server with autodetection. Cluster of several LANCOM DHCP servers per context (ARF network) enables caching
of all DNS assignments at each router. DHCP forwarding to multiple (redundant) DHCP servers
DHCP
NetBIOS/IP proxyNetBIOS
NTP client and SNTP server, automatic adjustment for daylight-saving timeNTP
Policy-based routing based on routing tags. Based on firewall rules, certain data types are marked for specific routing, e.g. to particular remote
sites or lines
Policy-based routing
Dynamic routing with RIPv2. Learning and propagating routes; separate settings for LAN and WAN. Extended RIPv2 including HopCount, Poisoned
Reverse, Triggered Update for LAN (acc. to RFC 2453) and WAN (acc. to RFC 2091) as well as filter options for propagation of routes. Definition
of RIP sources with wildcards
Dynamic routing
Layer 2 functions
VLAN ID definable per interface and routing context (4,094 IDs) IEEE 802.1QVLAN
Packets sent in response to LCOS service requests (e.g. for Telnet, SSH, SNTP, SMTP, HTTP(S), SNMP, etc.) via Ethernet can be routed directly to the
requesting station (default) or to a target determined by ARP lookup
ARP lookup
COM port server
COM-port server for DIN and USB interfaces. For multiple serial devices connected to it, the server also manages its own virtual COM ports via
Telnet (RFC 2217) for remote maintenance (works with popular virtual COM-port drivers compliant with RFC 2217). Switchable newline conversion
and alternative binary mode. TCP keepalive according to RFC 1122 with configurable keepalive interval, retransmission timeout and retries
COM port forwarding
USB print server
Host port for connecting USB printers via RAW-IP and LPD; bi-directional data exchange is possiblePrint server (USB 2.0)
LAN protocols
ARP, proxy ARP, BOOTP, LANCAPI, DHCP, DNS, HTTP, HTTPS, IP, ICMP, NTP/SNTP, NetBIOS, PPPoE (server), RADIUS, RIP-1, RIP-2, RTP, SIP, SNMP,
TCP, TFTP, UDP, VRRP
IP
802.1d Spanning Tree and 802.1w Rapid Spanning Tree support for dynamic path selection with redundant layer 2 connectionsRapid Spanning Tree
WAN protocols
PPPoE, Multi-PPPoE, ML-PPP, PPTP (PAC or PNS) and IPoE (with or without DHCP), RIP-1, RIP-2, VLAN, IPEthernet
1TR6, DSS1 (Euro-ISDN), PPP, X75, HDLC, ML-PPP, V.110/GSM/HSCSDISDN
WAN operating mode
ADSL1, ADSL2 or ADSL2+ with external ADSL2+ modemxDSL (ext. modem)
UMTS/HSDPA with external module at the USB interfaceUMTS/HSDPA* (ext. module)
ISDN data or voice usage via internal ISDN interfaceISDN
Analog or GPRS operation via serial interfaceAnalog/GPRS (ext. modem)
A UMTS USB modem is not supplied. Supported UMTS USB modems at www.lancom.eu/umts-support*) Note:
Interfaces
10/100/1000 Mbps Gigabit EthernetWAN: Ethernet
4 individual 10/100/1000 Mbps Ethernet ports; up to 3 ports can be switched as additional WAN ports with load balancing. Ethernet ports can be
electrically disabled within LCOS configuration. The ports support energy saving according to IEEE 802.3az
Ethernet ports
LANCOM 1781EW
Features as of: LCOS 8.60
