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NAT TCP Load Balancing

Written by Rene Molenaar on . Posted in Network Services

Scenario:

You are working as a networking trainee and in your pasttime you enjoy troubleshooting networks. Your roommate has a huge website and has bought multiple webservers to host the website. He doesn't have any more money for a decent load balancer so he asks you if you know any other method to share traffic along the webservers. Let's see if you can keep your balance...

Goal:

  • All IPv4 addresses have been preconfigured for you.
  • Static routes have been configured on the webservers and the host for full connectivity.
  • Configure HTTP server on all webservers.
  • Whenever router host sends an IP packet to IP address 192.168.45.100 port 80 it should be load-balanced using round-robin among the webservers.

IOS:

c3640-jk9s-mz.124-16.bin

Topology:

NAT TCP Load Balancing

Video Solution:

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Comments (5)

  • avatar
    Druvakumar
    2012-05-03 18:49:32

    Hi Rene,
    I have used below cmd's, but still translation is not working for me, show some light here pls.

    interface FastEthernet0/0
    ip address 192.168.123.4 255.255.255.0
    ip nat inside
    ip virtual-reassembly
    duplex auto
    speed auto
    !
    interface FastEthernet1/0
    ip address 192.168.45.4 255.255.255.0
    ip nat outside
    ip virtual-reassembly
    duplex auto
    speed auto


    ip nat pool WWW 192.168.123.1 192.168.123.3 prefix-length 24 type rotary
    ip nat inside destination list 25 pool WWW
    !
    access-list 25 permit 192.168.45.100

  • avatar
    Druvakumar
    2012-05-03 18:51:30

    Additional to my below comments.

    Below configuration are added in NAT router

  • avatar
    ReneMolenaar
    2012-05-04 10:59:20

    Here's an example that should work:

    Code:

    interface FastEthernet0/0
    ip nat inside
    !
    interface FastEthernet1/0
    ip nat outside
    Code:
    ip nat pool ROTATE prefix-length 24 type rotary
    address 192.168.123.1 192.168.123.1
    address 192.168.123.2 192.168.123.2
    address 192.168.123.3 192.168.123.3
    Code:
    ip nat inside destination list BALANCE pool ROTATE
    Code:
    ip access-list extended BALANCE
    permit tcp any host 192.168.45.100 eq www
    Code:
    ip alias 192.168.45.100 80

    Haven't tried it yet, I'll try to do the video asap.

  • avatar
    Druvakumar
    2012-05-09 05:38:17

    Many thanks Rene.