Coyote Point Systems Equalizer Spezifikationen PDF herunterladen (Seite 78)

Network Configuration

Networking Conventions

Several conventions are used within this section:

• Network addresses are represented in Classless Inter-Domain Routing (CIDR) notation, an IP addressing

scheme in the form A.B.C.D/X where X is the number of bits in the subnet mask.

• Subnets are referenced by the name of the VLAN which contains them, followed by the subnet name. For

example, internal:net means VLAN internal, subnet net.

• All VLAN configurations presented are untagged. The configurations and concepts in this document applies

for tagged VLANs as well.

• This section uses examples that are for IPv4 networking. However, the configuration for IPv6 networking

would be identical- with a couple of exceptions. These exceptions are identified - where applicable.

• This section uses examples from an Equalizer OnDemand system using untagged VLANs. If your

configuration uses tagged networks or Equalizer physical appliances, the network interfaces displayed here

will not match your configuration. This is normal and remainder of the section still applies

Networking Technologies

There are several networking technologies described herein that apply to Equalizer installations. They are

summarized below, however, specific rules and commands will be described in more detail as each networking

scenario is described in further detail.

Destination Routing: This is standard routing, as performed by any networking device. The device determines how

to send a packet to its destination by evaluating the destination IP address. If that IP address is on a local network,

the device sends the packet directly using the Ethernet layer. If, however, that IP address is on a remote network,

the device consults its

routing table

to determine how to send it. The routing table consists of a set of entries in the

form:

IP/NETMASK || GATEWAY

The device searches the routing table in a

most specific

least specific

manner in order to find the most

appropriate route to use. For example, if one entry is for the network 10.0.0.0/8 and another is for the network

10.0.0.0/24, a packet destined for the IP address 10.0.0.1 would use the /24 entry because it is

more specific.

However, a packet destined for 10.0.1.1 would use the /8 entry because the /24 entry does not apply to this

destination. Once a matching route is found, the device sends the packet on to the gateway (or router) that is

specified in this route. It is then this gateway's job to get the packet closer to its final destination.

Source-Based Routing: This concept is not unique to Equalizer, however the behavior of each device that

implements Source-based Routing can be different. The definition of source-based routing is simply that the

source IP address is used in the routing decision

. For Equalizer, this means that rather than having a single

destination routing table, the system actually has a set of destination routing tables, each used only when the

source IP address of a packet matches a particular network. A source-based routing table contains entries in the

form:

(SOURCE IP/NETMASK,DESTINATION IP/NETMASK) || GATEWAY

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