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Juniper 320M Configuration Advice for Multiple Public IP blocks

Posted on 2013-06-25
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Last Modified: 2016-04-02
HI,

I am looking for some help and advice on how to correctly configure a Juniper 320M firewall.

I work for a small Webhost and we have recently implemented a web hosting service based on some co-located servers at a Data Centre.

We were initially allocated a /28 block of Public IP addresses.  

These IP addresses are used by uublic facing Virtual machines and I was advised that these VM's should not sit behind a firewall.

I have therefore configured the a Juniper 320M firewall  as follows:

I have a BGroup Interface associated to the untrust Zone with the /28 range from the ISP assigned.  My feed from the Data Centre ISP provider is connected into one of the  ports on the firewall bound to this bggroup.  I also have a second Port bound to the BGroup. A Cat 5 cable runs from this port to a Switch where all the VM's Public NIC's are also attached.

In this way, at the moment, Traffic from the customer VM's can reach in and out without issues. I have some internal servers behind the firewall on a trust interface which are accessible via VIP and MIP as appropriate with policies applied to allow traffic from trust to untrust

I now have a requirement to add a second block of IP addresses for use by more customer VM's as we have run out of IP's from the first block.  

My problem is that I can't add these IP addresses to the BGGroup as there is no option for adding a secondary IP range for this this interface as with a normal interface.

I am basically looking for a recommendation as to how to configure the Juniper 320 so I can use multiple discrete blocks of Public IP's on the untrust Zone and allow traffic to these IPS's to reach the VM's without passing through the Firewall.  I also need to continue to let traffic from VIP\MIP pass through the firewall to the trust Zone.  

I fully admit I am inexperienced with the Juniper devices so I am looking for help in terms of how the above requirement can be fulfilled. If you need any further information regarding the setup then please ask.

Look forward to hearing from you.
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Question by:rswainston
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Sanga Collins earned 500 total points
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To add new public IP block that is different from your original, you need to use a loopback interface. You can configure an untrust-to-untrust policy to allow the traffic to these new IPs in the even you would like to use them as MIPs or VIPs.
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