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Chapter 4: Configuring the High-Level Network

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To create the equivalent of a default SNAT, it is necessary to assign each

unit its own floating self IP address on the external VLAN. This is done for

the same reason that separate aliases are assigned to the internal network as

part of routine active-active setup. (See Configuring an active-active system,

on page 6-11.) Because you already have a floating self IP address for the

external interface that is configured as belonging to unit one on unit one and

unit two on unit two, use the following procedure to create two unit-specific

IP aliases is as follows.

To create two unit-specific SNATs

1.On unit one, ensure that two floating self IP addresses are configured for

unit one. For example:

b self 11.11.11.3 vlan internal unit 1 floating enable

b self 172.16.16.3 vlan external unit 1 floating enable

2. Also on unit one, ensure that two floating self IP addresses are configured

for unit two. For example:

b self 11.11.11.4 vlan internal unit 2 floating enable

b self 172.16.16.4 vlan external unit 2 floating enable

3. Ensure that unit two has all of these self IP addresses by using the config

sync command to synchronize the changes to unit two:

b config sync all

4. Set up SNAT automapping as you would for an active/standby system,

but enable both external aliases:

b self 172.16.16.3 vlan external snat automap enable

b self 172.16.16.4 vlan external snat automap enable

b snat map internal to auto

ISPs and NAT-less firewalls

BIG-IP handles ISPs and NAT-less firewalls in the following manner:

• If multiple external interfaces are available, the inside addresses of the

firewalls in the load balancing pool may each be connected to different

interfaces and assigned to different VLANs.

• A SNAT is then enabled on each VLAN.

• A SNAT must also be enabled on the internal VLAN.

For example, if the internal VLAN is named internal and the external

VLANs are named external1 and external2, you would type the following

commands:

b snat internal to auto

b snat external1 to auto

b snat external2 to auto

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Dell 3-DNS Especificaciones Pagina 210