System, method and program for re-routing internet packets

Details System, method and program for re-routing internet packets System, method and program for re-routing internet packets

H - Electricity

04

L

H04L 12/28 (2006.01)

Patent

CA 2637763

A first site comprises a first ISP, a first server and a first router interposed between the first ISP and the first server. A second site comprises a second ISP, a second server and a second router interposed between the second ISP and the second server. While the second server is operating, both the first and second routers broadcast announcements of an IP address of the second server. The announcements of the IP address broadcast by the first router indicate the first router as a less preferred route to the IP address than the announcements of the IP address by the second router indicating the second router as a route to the IP address. Consequently, packets addressed to the IP address are routed to the second server via the second ISP and the second router. Subsequently, the second site fails, and concurrently, the second router ceases to broadcast announcements of the IP address of the second site and the first router continues to broadcast announcements of the IP address of the second site. Consequently, subsequent packets addressed to the IP address are routed to the first server via the first ISP and the first router, bypassing the second ISP. A semiautomatic technique is also disclosed.

La présente invention concerne un système comportant un premier site comprenant un premier fournisseur de services Internet (ISP), un premier serveur et un premier routeur interposé entre le premier ISP et le premier serveur. Un second site comprend un second ISP, un second serveur et un second routeur interposé entre le second ISP et le second serveur. Lors du fonctionnement du second serveur, les premier et second routeurs diffusent des annonces d'une adresse IP du second serveur. Les annonces de l'adresse IP diffusées par le premier routeur indiquent le premier routeur comme étant une route moins préférable à l'adresse IP que les annonces de l'adresse IP par le second routeur indiquant le second routeur comme étant une route à l'adresse IP. Par conséquent, des paquets destinés à l'adresse IP sont acheminés vers le second serveur vis le second ISP, et le second routeur. Ultérieurement, le second site tombe en panne, et dans le même temps, le second routeur cesse de diffuser l'adresse IP du second site et le premier routeur continue de diffuser les annonces de l'adresse IP du second site. Par conséquent des paquets ultérieurs destinés à l'adresse IP sont acheminés vers le premier serveur via le premier ISP et le premier routeur, contournant le second fournisseur de services Internet. L'invention concerne également une technique semi-automatique.

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