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10.14.2008 at 03:46PM PDT, ID: 23814825
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9.3

DMZ Smart Host

Asked by jaysonfranklin in Cisco PIX Firewall

Hello Experts!

I have a Smarthost\Email filter in a DMZ network.. but i don't seem to have the correct config on the Pix.

Here's the DMZ access-list

access-list DMZ_In permit tcp host SmartHost host emailsvr eq smtp <--so it can relay mail to the inside
<will eventually put statement here that denies internal subnets from DMZ, but need to get this working first>
access-list DMZ_In permit tcp host SmartHost any eq smtp  <--so it can send mail to the outside world
access-list DMZ_In permit tcp host SmartHost any eq domain <---so it can query dns

Here are my routes..
sends mail into the filter/smarthost
static (DMZ,outside) tcp 1.2.3.4 smtp Smarthost smtp netmask 255.255.255.255 0 0

then i added these...not sure if i actually need the EmailServer one. but thought maybe i can leave it in case the filter dies and i need the exchange server to send email directly to the internet all i have to do is change settings on the email server..
static (inside,DMZ) emailSvr emailSvr netmask 255.255.255.255 0 0
static (DMZ,inside) SmartHost SmartHost netmask 255.255.255.255 0 0

Here's the thing... we are receiving emails.. but when we try to send emails.. they only make it out thru the Smarthost if i add  this line to the ACL

permit ip any any

if i take it away, the emails start queuing up in the Smarthost. So, unfortunately i cannot start using the smarthost until this is fixed, as i do not want to permit ip any any into the network.

Do I need another route? maybe static (DMZ,outside) SmartHost SmartHost ??

also, what is the difference between doing a NoNat ACL for the DMZ and doing them staticly? is one safer?

also, i assume that doing this: static (DMZ,inside) SmartHost SmartHost netmask 255.255.255.255 0 0

will static nat the whole IP address, but im wondering if doing this:
static (DMZ,inside) tcp SmartHost smtp SmartHost smtp netmask 255.255.255.255 0 0 - will be safer cuz it seems like it just PATs the port number?

still kinda new to how the pix works so some clarification on this would be awesome.

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About this solution

Zone: Cisco PIX Firewall
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Solution Provided By: lrmoore
Participating Experts: 1
Solution Grade: A
 
 
 
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