Configure ACE with Source NAT and Client IP Header Insert [Cisco Services Modules]

Document ID: 107399

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Configure ACE with Source NAT and Client IP Header Insert

Related Products/Technology

• Cisco ACE Application Control Engine Module

Introduction
Prerequisites
      Requirements
      Components Used
      Conventions
Configure
      Network Diagram
      Configurations
Verify
Troubleshoot
Related Information

Introduction

This document provides a sample configuration for the Application Control Module (ACE) configured for source Network Address Translation (NAT) while inserting the original client IP address in the HTTP header. When using source NAT, the client IP address is not passed to the load balanced server. The insertion of the Client IP address into the header allows the servers to see the IP that made the connection. The servers default gateway points to the MSFC in the server VLAN. The only communication that needs to be load balanced will pass through the ACE.

This sample uses two contexts:

the admin context is used for remote management and Fault Tolerant (FT) configuration
the second context, C1, is used for load balancing

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

This document is not restricted to specific software and hardware versions.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Catalyst 6500—ACE slot 2 C1 context
Catalyst 6500—ACE slot 2 Admin context
Catalyst 6500—MSFC configuration

ACE C1 Context

switch/C1#show run
Generating configuration....

access-list any line 8 extended permit icmp any any 
access-list any line 16 extended permit ip any any 

!--- Access-list used to permit or deny traffic from entering the ACE.

probe tcp SERVERS
  interval 5
  passdetect interval 10

!--- TCP probe used to test the availability of the servers.

parameter-map type http HTTP_PARAMETER_MAP
  persistence-rebalance

!--- Parameter-map used to configure advanced http behavior.
!--- Persistence-rebalance inspects every get and matches to specific content.
!--- Without this command only the first get in a tcp session will be inspected.

rserver host S1
  ip address 192.168.0.200
  inservice
rserver host S2
  ip address 192.168.0.201
  inservice
rserver host S3
  ip address 192.168.0.202
  inservice
rserver host S4
  ip address 192.168.0.203
  inservice

serverfarm host SF-1
  probe SERVERS
  rserver S1
    inservice
  rserver S2
    inservice
  rserver S3
    inservice
  rserver S4
    inservice

!--- Serverfarm used for load balanced traffic.

class-map match-all L4VIPCLASS
  2 match virtual-address 172.16.0.15 tcp eq www

!--- Layer 4 class-map defining IP address and port.

class-map type management match-any REMOTE_ACCESS
  2 match protocol ssh any
  3 match protocol telnet any
  4 match protocol icmp any
  5 match protocol snmp any
  6 match protocol http any

!--- Remote management class-map defining protocols allowed to manage the ACE.

policy-map type management first-match REMOTE_MGMT_ALLOW_POLICY
  class REMOTE_ACCESS
    permit

policy-map type loadbalance http first-match WEB_L7_POLICY
  class class-default
    serverfarm SF-1
    insert-http x-forward header-value "%is"

!--- Policy-map will insert the IP address of the client when sending traffic to the serverfarm.

policy-map multi-match VIPs
  class L4VIPCLASS
    loadbalance vip inservice
    loadbalance policy WEB_L7_POLICY
    loadbalance vip icmp-reply active
    loadbalance vip advertise active
    nat dynamic 1 vlan 511
    appl-parameter http advanced-options HTTP_PARAMETER_MAP

!--- Multi-match policy ties the class-map and policy-maps together.
!--- Clients matching class L4VIPCLASS will use source NAT.

interface vlan 240
  ip address 172.16.0.130 255.255.255.0
  alias 172.16.0.128 255.255.255.0
  peer ip address 172.16.0.131 255.255.255.0
  access-group input any
  service-policy input REMOTE_MGMT_ALLOW_POLICY
  service-policy input VIPs
  no shutdown

!--- Client side VLAN; This is the VLAN clients will enter the ACE.
!--- Apply access-lists and service-policies that are needed.

interface vlan 511
  ip address 192.168.0.130 255.255.255.0
  alias 192.168.0.128 255.255.255.0
  peer ip address 192.168.0.131 255.255.255.0
  access-group input any
  nat-pool 1 192.168.0.254 192.168.0.254 netmask 255.255.255.0 pat
  no shutdown

!--- Server side VLAN.

ip route 0.0.0.0 0.0.0.0 172.16.0.1

!--- Default gateway points to the MSFC.

switch/C1#

ACE Admin Context

switch/Admin#show running-config
Generating configuration....

boot system image:c6ace-t1k9-mz.A2_1_0a.bin

resource-class RC1
  limit-resource all minimum 50.00 maximum equal-to-min

!--- Resource-class used to limit the amount of resources a specific context can use.

access-list any line 8 extended permit icmp any any 
access-list any line 16 extended permit ip any any 

rserver host test

class-map type management match-any REMOTE_ACCESS
  2 match protocol ssh any
  3 match protocol telnet any
  4 match protocol icmp any
  5 match protocol snmp any
  6 match protocol http any

policy-map type management first-match REMOTE_MGMT_ALLOW_POLICY
  class REMOTE_ACCESS
    permit

interface vlan 240
  ip address 172.16.0.4 255.255.255.0
  alias 172.16.0.10 255.255.255.0
  peer ip address 172.16.0.5 255.255.255.0
  access-group input any
  service-policy input REMOTE_MGMT_ALLOW_POLICY
  no shutdown
interface vlan 511
  ip address 192.168.0.4 255.255.255.0
  alias 192.168.0.10 255.255.255.0
  peer ip address 192.168.0.5 255.255.255.0
  access-group input any
  no shutdown

ft interface vlan 550
  ip address 192.168.1.4 255.255.255.0
  peer ip address 192.168.1.5 255.255.255.0
  no shutdown

!--- VLAN used for fault tolerant traffic.
 
ft peer 1
  heartbeat interval 300
  heartbeat count 10
  ft-interface vlan 550

!--- FT peer definition defining heartbeat parameters and to associate the ft VLAN.

ft group 1
  peer 1
  peer priority 90
  associate-context Admin
  inservice

!--- FT group used for Admin context.

ip route 0.0.0.0 0.0.0.0 172.16.0.1

context C1
  allocate-interface vlan 240
  allocate-interface vlan 511
  member RC1

!--- Allocate vlans the context C1 will use.

  ft group 2
  peer 1
  no preempt
  associate-context C1
  inservice

!--- FT group used for the load balancing context C1.

username admin password 5 $1$faXJEFBj$TJR1Nx7sLPTi5BZ97v08c/  role Admin domai
n default-domain 
username www password 5 $1$UZIiwUk7$QMVYN1JASaycabrHkhGcS/  role Admin domain 
default-domain 

switch/Admin#

Router config


!--- Only portions of the config relevant to the ACE are displayed.

sf-cat1-7606#show run
Building configuration...

!--- Output Omitted.


svclc multiple-vlan-interfaces
svclc module 2 vlan-group 2
svclc vlan-group 2  220,240,250,510,511,520,540,550

!--- Before the ACE can receive traffic from the supervisor engine in the Catalyst 6500
!--- or Cisco 6600 series router, you must create VLAN groups on the supervisor engine,
!--- and then assign the groups to the ACE.
!--- Add vlans to the vlan-group that are needed for ALL contexts on the ACE.

interface Vlan240
 description public-vip-172.16.0.x 
 ip address 172.16.0.2 255.255.255.0
 standby ip 172.16.0.1
 standby priority 20
 standby name ACE_slot2

!--- SVI (Switch Virtual Interface). The standby address is the default gateway for the ACE.


!--- Output Ommited.

sf-cat1-7606#

Verify

Use this section to confirm that your configuration works properly.

The Output Interpreter Tool (registered customers only) (OIT) supports certain show commands. Use the OIT to view an analysis of show command output.

show serverfarm name—Displays information about the serverfarm and the state of the rservers.