Bonding And Fail Over | Internet Services

By: T1 Xstream  09-12-2011
Keywords: Internet Services, Internet Connections, Multiple Internet Services

Aggregating multiple Internet services enables a business to failover from a primary Internet connection to a backup Internet connection, as well as, bond multiple connections. Outbound failover is suitable for LAN's that are not accessed from the Internet.

Inbound fail over is required when a LAN hosts applications accessed remotely. Inbound fail over considers that each hosted application is assigned an IP address related to its Internet connection and different Internet connections use different IP addresses.

The benefits of aggregating multiple connections include:

* 100% reliability to the Internet or corporate network
* failover from a primary service to a backup service
* increase upload and download speeds
* replace expensive T1 or E10 connections with lower cost alternatives
* separate Internet and interoffice traffic

There are two failover solutions for traffic outbound to the Internet. They are appropriate if people do not need to access your application servers from the Internet.

1. Cold standby requires physically moving your LAN from one WAN connection to another. The cable between your LAN and primary WAN connection is moved to the backup WAN connection and your firewall or edge router is reprogrammed to use the IP addresses and gateway of the backup WAN connection. This takes a few minutes or longer if you are offsite.

2. Automatice failover uses equipment that supports two WAN links and capable of automatically failing over when there is a certain amount of packet loss or complete outage. The status of the primary connection is normally determined by pinging an IP address through the primary connection and measuring packet loss. The equipment automatically fails back to the primary connection when the primary one returns to service.

1. Dynamic DNS is used in addition to automatic failover. It only works if inbound traffic resolves to the host name of the application server instead of directly to its static IP address. The host name in turn resolves to the static IP address of the application server. When the primary connection fails, the host name automatically resolves to the IP addresses of the backup connection.

DDNS is provided for free or a nominal charge by DDNS providers. There is no Internet stardard and most DDNS providers only support host names that are extensions of their own domain name (e.g., Remote users are disconnected when the primary connection drops and can only reconnect after the DDNS server is updated. DDNS is most effective when all remote users share the the same DDNS server. Otherwise, the length of the change over depends on how long it takes the DNS change to propagate throughout the Internet.

2. IP Failover maintains the same IP addresses on the primary and failover connections. It is by far the best of all failover solutions. When the primary connection goes down, the failover appliance switches to the backup connection, establishes a VPN tunnel to your ISP who redirects the IP's assigned to your primary connection to the VPN tunnel. Within seconds, the inbound traffic flows through the VPN tunnel instead of the primary connection.

Skyway's IP failover meets your business needs. We normally provide the VPN capability and primary Internet connection. We supply the backup connection(s) or work with backup connection(s) provided by other ISP's. The service is also available to customers outside our Internet access serving area. In this case, we tunnel our IP addresses through both the primary and backup connections. It is even possible to bond multiple connections and IP failover between them.

Bonding is when two or more connections are simultaneously used to access the Internet. It applies to modem connections, broadband connections and any combination of Internet access medium. True bonding is when the combined bandwidth is available to any application. For example, simultaneously using both connections to download a single FTP file or establish a single Citrix connection. Most bonding is done by load balancing between the connections. For example.

2. The services are load balanced by session or bandwidth utilization. Session balancing sends each session through a different connection. Bandwidth balancing sends all traffic through a specific connection until a certain percentage of the connection is utilized. At that point, the second connection is used.

T1 Xstream combines multiple Internet connections using different IP addresses into a singe connection with a single IP address. Inbound and outbound traffic only slows down if an individual Internet service fails. VoIP and terminal services stay connected.

Please contact us for a detailed consultation:

Keywords: Internet Connections, Internet Services, Multiple Internet Services