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Activities of many enterprises rely increasingly on the Internet should not require constant connection, stable. The Internet service provider (ISP) can satisfy this requirement, but the problem is the cost to rent the leased line (leased-line) stability and continuity is too high. Currently the ISP service provider broadband ADSL Internet connection with acceptable price that is relatively high bandwidth. So if the demand is not too strict about traffic, we can subscribe to multiple ADSL lines together, even many ISP's registration to prevent incidents. The problem is how to combine them both cost effective and administrators. The hardware for the load balancing functions and fully supports the features most needed now is a top choice for businesses today. So the principles and features of the transmission line is integrated inside the device look like?


Normally a device Load Balancing (LB) will include: 2 or more WAN ports for a total bandwidth of no more than 4.5 Mbps, 1 LAN port, 1 x DMZ (Demilitarized Zone), all with 10/100Mbps , operates in full duplex mode or half-duplex. WAN connection can be leased line, broadband Internet connection DSL / cable, ISDN ... Inside LB, operating system management activities
There is no general formula for all cases, so LB solution is built to give users more choice algorithm to efficiently depending on the specific situation. You can set the device to select the WAN connection weights based on the number of connections, the download speeds / up and review of each WAN traffic. The "routing" also includes automatic backup capabilities. You can choose a fixed connection to the WAN, WAN for redundancy remaining (load sharing), is activated automatically when the connection problem and automatically disconnect when the connection works again.
A feature not to be missed in this device is the ability to "multi-homing". If you put a server in the LAN service provider for Internet users access (e-mail server, web, ftp ...), the service will be interrupted if the WAN connection is the problem. LB SwiftDNS technology used to automatically transfer the settings from the Internet to access the local server to the WAN connection is active. LB also help you manage your bandwidth in / out, ensuring that critical applications always have enough bandwidth to operate, especially during peak hours.


Features of the integration with the LB is now integrated firewall protects the LAN and DMZ, capable of DoS attack prevention, limit the number of connections, set up rules to allow or disallow based the source address / destination port services. In addition to the DMZ port for the server's public IP address, LB also supports virtual servers located inside the LAN. Your note if your network has a firewall available, fitted with LB also does not change the system, you simply connect to the firewall's DMZ port LB without editing any parameter .




Load balancing for connections from the internal network to access the external (outbound) is easy but from the outside (Internet) on the local network (inbound) is hard. In fact, this feature is only necessary to provide enterprise web services, ftp, mail ... inside the internal network to customers or remote employees access. Thanks to the ability to "inbound" that the uninterrupted services, provided either are active Internet connection dong.LB perform this function through integrated DNS services available. In addition, it supports many dynamic DNS service available, is essential for broadband connection is not granted a dynamic IP address
Quality of service (QoS) and bandwidth management: You can create multiple policies to ensure minimum bandwidth, maximum and priority level for each department, users and services. In addition, you also set quotas for each session and each day for each individual or group of users and services.
VPN Server / Client enables integrated VPN connection between the branch without the services of the ISP, allowing users to access internal network when traveling or working from home, supporting DES encryption / SHA-1/MD5 3DES/AES and authentication, the protocol supports standard IPSec VPN, PPTP and L2TP so you do not have to install any software on Windows clients, the maximum number of VPN tunnels can reach up to 1000 Concurrency.
The LB device has a DMZ port, the DMZ network firewall protection also. You can set the server to provide web services, ftp, mail ... branch in the DMZ. In addition, a number of LB also support from 1 to 4 virtual servers allow you to set the server to provide services within the branch network.
A number of senior LB allows you to determine the percentage of traffic load on WAN1, and the remaining load will be offset WAN2 connection. In load balancing mode, you can monitor the total traffic through each WAN port into 3 types: Bytes Tx + Rx (number of bytes transmitted), Packets Tx + Rx (number of packets transmitted) or Established Sessions (session number are working). Depending on demand, you can select the appropriate mode to be able to "count" is the total bandwidth used on each port. Then, you can observe and coordination bandwidth on each WAN port so that more reasonable.

However, sometimes smart devices to interfere. For example, the implementation of e-commerce transactions through the network, if the LB switch automatically WAN connection in the session, you will have management server transaction rejected because your IP address is changes. LB has solved this problem with the "fixed routing". You can set up rules for the connected transactions should check the IP address after selecting the WAN optimization WAN will not change during the session.

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