Coyote Point Systems Equalizer Specifikace stáhnout pdf (Strana 110)

Network Configuration

Policy Routing

Routing is the process of selecting the network path to use when one device (the source) sends a packet to

another device (the destination) on the network. The other device can be on a subnet that is directly connected to

Equalizer, or it may be on a remote subnet.

To communicate with a device that resides on a directly connected IP subnet (that is, both devices are in the same

broadcast domain

), any network device uses the information in its Address Resolution Protocol (ARP) table to

send packets directly to the destination IP address.

In order to send packets to a destination on a different network, the packet is instead sent a “next-hop” device,

usually a router, that determines how to forward it further. If the routing device is present on the same network as

the destination, it can send the packet directly to the destination. Otherwise, it forwards it on to another router, and

the process continues.

Equalizer provides the ability to configure routing to match network topologies from the simplest to the very

complex through

policy routing

. Policy routing gives the administrator the ability to completely define routing

behavior for each subnet, based on either the

destination IP address

or the

source IP address

of the packet leaving

Equalizer.

Destination and Source Based Routing

The figure below represents a basic IP network routing path where data packets traverse to and from hosts,

switches and routers. Policies are configured through administrative control to route packets through the desired

devices over subnets and on to servers and clients.

When a device needs to send an IP packet to a different device, it performs the following:

1. If the destination address is located locally (on the sender device) it sends the packet using the Operating

System and not the network.

2. If the packet isn't intended for this device the system routing table is checked for instructions on how to

deliver the packet, usually through a routing table.

Routing tables are searched in a

most-specific

least-specific

manner. If no packet delivery rules are found, a

packet will be discarded. The least-specific entry in a routing table is usually the default route, which essentially

provides a route to use if no specific matching entry has been found.

Most network devices route packets solely on the basis of the destination address in the packets. Some devices,

like Equalizer, can route packets based on the source address as well, and can completely specify the network

path a packet will take. This is called source-based routing.

Equalizer uses a combination of source routing tables and the cluster spoof option to route packets through the

network. Possible routing schemes are presented herein describing packet source-based routing and how they are

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