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SMTP problems with SMC Barricade soho firewall (SMC7004VBR)

SMTP problems with SMC Barricade soho firewall (SMC7004VBR) - I've got a strange problem with an SMC Barricade.  I have a small office with three PCs behind an SMC7004VBR (751.7922) (hardware v 1.01, boot code: r1.0606.0707) which is behind a new Actiontec/Verizon DSL modem.  

Recently I replaced the DSL modem.  The next day I began having trouble with SMTP traffic on all three workstations.   Outbound mail was not being delivered.  However, when I plug my laptop (not one of the three PCs on site) into the SMC SMTP traffic is delivered.  I spoke to SMC L1 techs who implied that this may be an issue with the SMC7004VBR and we tried port triggering for 25/110 to no avail.   I know of no reason for the SMC to interfere with SMTP and a review of the interface reveals no outbound filters.  Next step is to replace the SMC with another device.  Anyone have any suggestions?
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pnkljohnson2
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pnkljohnson2
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1 Solution
 
Rob WilliamsCommented:
Is the Actiontec a combined modem and router? if so have you tied by-passing the SMC just a s a test? If it is a combo unit you may want to put it in bridge mode to simplify the connection. Bridging effective makes the Actiontec a basic modem.
You shouldn't need to use any port forwarding or triggering as this is an outgoing connection.
It is possible that if the Actiontec is a combo unit, that it uses the same LAN side subnet as the SMC causing some routing issues. Putting the Actiontec in bridge mode would eliminate that.

I assume changing the modem does not mean you have changed ISP's?
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pnkljohnson2Author Commented:
The ActionTec is a modem/router and I'll try bridge mode.  If I connect the clients directly to the ActionTec SMTP traffic is delivered properly.  I brought the SMC back to my shop and I'm not having any issues with SMTP.  Bridge mode may be the solution.  Thanks for the update.
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Rob WilliamsCommented:
Let us know how it goes.
Cheers !
--Rob
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Rob WilliamsCommented:
Thanks pnkljohnson2.
Cheers !
--Rob
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