Default Routing help

Hey guys,

So I will try to explain this the best I can. I have been given another public ISP address to create a separate network. Currently we have our original Public ISP assigned to a sonic wall router in which everything goes back to the default gateway that our ISP is using to the WAN side. The LAN side has two subnets (both out of two separate interfaces, one for data, one for phone. That is all working and good to go.
The second Public IP however is going out through the same first usable on our original public address. After talking with our ISP they tell us we need to set up a default routing path to show that anything that comes from that New IP to route to the old IP. Unfortunately I do not know how to do this. Anyone else do this? I have tried to include a picture for better reference.
Network-Setup.png
sivtecAsked:
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Trent SmithCommented:
You should be able to go into the Network / Routing area and set your outgoing port to only use the port that is being used by your old IP.  Then all the traffic will go out that way but traffic will be able to come in on either port.
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sivtecAuthor Commented:
Thanks Trent for the response. I get what your saying, I suppose my question is, how do I do that? Is this some thing that needs to be done via NAT?
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Trent SmithCommented:
Here is a link to a similar question asked here on Experts Exchange.

http://www.experts-exchange.com/Hardware/Networking_Hardware/Firewalls/Q_24519839.html
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Trent SmithCommented:
Are you looking to send all traffic through that one port or just primarily your SMTP traffic?
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sivtecAuthor Commented:
We need two completely separate networks. one using the original public IP (we will call this Public IP A) and using the new public IP (Public IP B) However the way COX set it up was not through another main line from the DMark but rather through the same gateway that our Public IP A was using. So on our main router we need to be able to translate all Public IP B traffic to the Public A gateway.
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Trent SmithCommented:
If you look in Network WAN failover and LB does it list both your external ports?  If so can you remove the secondary port and see if that gives you the intended results?
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sivtecAuthor Commented:
I added some numbers to the original picture to be more specific. Hopefully this helps.
Network-Setup.png
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Trent SmithCommented:
Do you have anything that requires use of a specific external IP address that would stop you from using both ports?  If you configure the new external to use the same gateway as the original then you should be able to use both with no issues.
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sivtecAuthor Commented:
Hey Trent, excuse my lack of knowledge here, are you saying for one of the interfaces on the sonicwall to do this?:
IP address 2.2.2.146
Mask 255.255.255.248
Gateway 1.1.1.145

If so, I am not sure how X3 would be able to determine to use 2.2.2.146 as the public IP address.
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masnrockCommented:
Did COX give you two public IP addresses in two different subnets, or two within the same subnet? That can drastically affect how to answer your question.
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sivtecAuthor Commented:
Meant to update this ticket. We ended up getting rid of our old public IP and using the new block of IP's we got to separate the network.
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sivtecAuthor Commented:
Ended up going a different route and switching to a new block of addresses.
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