Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual download pdf (Page 130)

118 ServerIron ADX NAT64 Configuration Guide

53-1002444-02

Translation timeouts

DRAFT: BROCADE CONFIDENTIAL

FIGURE 21 Example of IP NAT with VIP overlap

In this example, any host on the inside network (10.1.1.0), which has to initiate a connection to the

remote host, will get translated to the virtual server IP address (20.20.20.3). On the other hand,

any connection coming to the virtual server from the outside network will get load balanced to one

of the real servers (rs1 and rs2).

NOTE

Static NAT is not supported with VIP overlap.

Translation timeouts

The NAT translation table contains all active NAT translation entries on the device. An active entry is

one which the ServerIron ADX creates for a private address when the client at that address sends

traffic to the outside network.

The ServerIron ADX performs the following steps to provide NAT translation for a source IP address:

• If an active NAT entry exists for the session in the translation table, the ServerIron ADX uses

that entry.

• If no active NAT entry exists for the session in the translation table, the ServerIron ADX creates

a new entry and places it into the translation table.

Each NAT entry remains in the translation table until the entry ages out.

eth 1/1

20.20.20.1/24

eth 1/2

10.1.1.1/24

VIP

20.20.20.3

Remote Server

60.60.60.60

10.1.1.101

10.1.1.102

Real Server

rs1

10.1.1.103

Real Server

rs2

10.1.1.104

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Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 130