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WLAN

Layer-3 Tunneling in conformity with the CAPWAP standard allows the bridging of WLANs per SSID to a separate IP subnet. Layer-2 packets are

encapsulated in Layer-3 tunnels and transported to a LANCOM WLAN controller. By doing this the access point is independent of the present

infrastructure of the network. Possible applications are roaming without changing the IP address and compounding SSIDs without using VLANs.

Layer-3 Tunneling

The WLAN standard IEEE 802.11u (Hotspot 2.0) allows for a seamless transition from the cellular network into WLAN hotspots. Authentication

methods using SIM card information, certificates or username and password, enable an automatic, encrypted login to WLAN hotspots - without

the need to manually enter login credentials.

IEEE 802.11u

The effective distances and transmission rates that can be achieved are depending of the site RF conditions*) Note

WLAN clients are directed actively to the best available access point to provide the best overall load balancing and the highest possible bandwidth

for each client. Client Steering can be based on client number, frequency band, and signal strength.

Client Steering*

Only in installations with WLAN controller*) Note

IEEE 802.11n Features

MIMO technology is a technique which uses multiple transmitters to deliver multiple data streams via different spatial channels. Depending on the

existing RF conditions the throughput is multiplied with MIMO technology.

MIMO

MAC Aggregation increase the IEEE 802.11 MAC efficiency by combining MAC data frames and sending it out with a single header. The receiver

acknowledges the combined MAC frame with a Block Acknowledgement. Depending on existing RF conditions, this technique improves throughput

by up to 20%.

MAC Aggregation and Block

Acknowledgement

Coding method according to IEEE 802.11n. The Space Time Block Coding improves reception by coding the data stream in blocks.Space Time Block Coding (STBC)

Low Density Parity Check (LDPC) is an error correcting method. IEEE 802.11n uses convolution coding (CC) as standard error correcting method,

the usage of the more effective Low Density Parity Check (LDPC) is optional.

Low Density Parity Check (LDPC)

Maximal Ratio Combining (MRC) enables the receiver (access point), in combination with multiple antennas, to optimally combine MIMO signals

to improve the client reception at long-range.

Maximal Ratio Combining (MRC)

The guard interval is the time between OFDM symbols in the air. IEEE 802.11n gives the option for a shorter 400 nsec guard interval compared to

the legacy 800 nsec guard interval. Under ideal RF conditions this increases the throughput by upto 10%

Short Guard Interval

WLAN operating modes

Infrastructure mode (autonomous operation or managed by LANCOM WLAN controller)WLAN access point

Use of the LAN connector for simultaneous DSL over LAN, IP router, NAT/Reverse NAT (IP masquerading) DHCP server, DHCP client, DHCP relay

server, DNS server, PPPoE client (incl.Multi-PPPoE), PPTP client and server, NetBIOS proxy, DynDNS client, NTP, port mapping, policy-based routing

based on routing tags, tagging based on firewall rules, dynamic routing with RIPv2, VRRP

WLAN router

Transparent WLAN client mode for wireless Ethernet extensions, e.g. connecting PCs or printers by Ethernet; up to 64 MAC addresses. Automatic

selection of a WLAN profile (max. 8) with individual access parameters depending on signal strength or priority

WLAN client

Firewall

Incoming/Outgoing Traffic inspection based on connection information. Trigger for firewall rules depending on backup status, e.g. simplified rule

sets for low-bandwidth backup lines. Limitation of the number of sessions per remote site (ID)

Stateful inspection firewall

Check based on the header information of an IP packet (IP or MAC source/destination addresses; source/destination ports, DiffServ attribute);

remote-site dependant, direction dependant, bandwidth dependant

Packet filter

Network Address Translation (NAT) based on protocol and WAN address, i.e. to make internal webservers accessible from WANExtended port forwarding

N:N IP address mapping for translation of IP addresses or entire networksN:N IP address mapping

The firewall marks packets with routing tags, e.g. for policy-based routing; Source routing tags for the creation of independent firewall rules for

different ARF contexts

Tagging

Forward, drop, reject, block sender address, close destination port, disconnectActions

Via e-mail, SYSLOG or SNMP trapNotification

Quality of Service

Dynamic bandwidth management with IP traffic shapingTraffic shaping

Dynamic reservation of minimum and maximum bandwidths, totally or connection based, separate settings for send and receive directions. Setting

relative bandwidth limits for QoS in percent

Bandwidth reservation

Priority queuing of packets based on DiffServ/TOS fieldsDiffServ/TOS

Automatic packet-size control by fragmentation or Path Maximum Transmission Unit (PMTU) adjustmentPacket-size control

Automatic or fixed translation of layer-2 priority information (IEEE 802.11p-marked Ethernet frames) to layer-3 DiffServ attributes in routing mode.

Translation from layer 3 to layer 2 with automatic recognition of IEEE 802.11p-support in the destination device

Layer 2/Layer 3 tagging

LANCOM L-151gn Wireless

Features as of: LCOS 9.00

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LANCOM L-151gn Wireless 1

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