Placement of VPN Appliance on Internal Network

Unanswered Question
May 7th, 2010
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I've looked in a lot of places but haven't really found anything applicable to my situation. Where I work we are looking to deploy a 1812 series router for an internal vpn to provide access to a server farm on the internal network of the company I work for. As of right now this internal internal network is "protected" by a set of F5 BigIP Load Balancers and a Microsoft VPN. The problem is the only connection is through the load balancers. To the best of my understanding of networking and high availablity I would want to install the router with its own connection that is not behind the load balancers. Is this the correct assumption? Is there any guides that I could be pointed toward that addresses this type of configuration setup?

Thanks.



Current Configuration:

* Traffic to the Server Farm is restricted only to traffic for the applications hosted by the Farm

--------------------------              -------------------------              --------------------

| Internal Network |  ------>  | Load Balancers | ---------> | VPN Server |

---------------------------             -------------------------              --------------------

                                                    |                            |   * Traffic travels to the rest of the server farm through the vpn for server administration

                                                    |                            |

                                                    |                --------------------

                                                     ------------> | Server Farm |

                                                                     --------------------



New Theorical Setup:


--------------------------               -------------------------

| Internal Network |  ------>  | Load Balancers |

---------------------------              -------------------------

         |                                           |

         |                                           |

         |                                           |                --------------------

         |                                            ------------> | Server Farm |

         |                                                            --------------------

         |                                                                   |

         |                                                                   |

         |   *Administrative Traffic                 -----------------

         ------------------------------------------------->  | 1812 ISR |

                                                               ----------------

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