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DMZ SMTP Gateway and rules

So i have my SMTP gateway server on the DMZ, with a rule that allows 25 traffic in to the DMZ.  I then have the SMTP server pointing to a smart host on the inside network which is my exchange server.  I only have one NIC.  I am going to assign that NIC a public DMZ address and set the gateway to the firewall.  I will then setup another rule allowing the traffic in from the firewall DMZ to the lan.  Will the firewall be able to route the smtp traffice back into the LAN?  it is a sonicwall 3060.  Or do i need to set the server with 2 NICS?  How does that work?  Two NICS does not make sense to me.  I am assuing the firewall can route the traffic back into the LAN.
thanks

trying to learn how this works with a server in the DMZ and One NIC
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YankeeFan03
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YankeeFan03
1 Solution
 
PennGwynCommented:
Yes, that's all correct.  The idea of a multi-legged firewall is to route traffic between the DMZ and the internal network back through the firewall for filtering.  A second NIC would offer a path that bypasses this security.

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YankeeFan03Author Commented:
great thankyou
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