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Address translation: SNATs, NATs, and IP forwarding

BIG-IP® Reference Guide 4 - 127

•When the equivalent of a default SNAT, that is, a SNAT that continues

to work in the event of a failure in one BIG-IP, is required for BIG-IP

units in active-active mode. (The conventional default SNAT does not

work in active-active mode.)

Adding an automapped default SNAT

The BIG-IP allows you to take advantage of the SNAT automapping feature

when adding a default SNAT. When you add a default SNAT, you are

enabling the BIG-IP to map every node on the internal network to a default

translation address. With the automapping feature, you do not need to define

a specific translation address to which all nodes on the network will be

mapped.

To add the automapped default SNAT using the

Configuration utility

1. In the navigation pane, click NATs.

The NATs screen displays.

2. Click the SNATs tab.

3. Click the Add Default button.

The Add Default SNAT screen opens.

4. Click the Automap button.

5. Click Done.

To add the automapped default SNAT from the command

line

To add a default SNAT using the automapping feature, type the bigpipe

snat command as follows:

b snat map default to auto

Note

A default SNAT cannot be added for an active-active configuration. For

more information, see Adding automapped SNATs for active-active

configurations, on page 4-129.

Adding automapped SNATs for standard (active-standby) configurations

When enabling SNAT automapping for VLANs, the BIG-IP handles the

SNATs in the following ways:

• If you create a SNAT on an internal VLAN, a SNAT is performed on any

connection made from that VLAN.

•If you enable snat automap on a single self IP address, the translation

address is that self IP address.

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Dell 3-DNS Especificaciones Pagina 207