I still seem to be having problems with setting up my mail server on a one to one NAT.  Internally mail fails to connect via name resolution, externally it works fine.  Several people suggested I set up internal DNS to resolve this issue but it does not seem to be working.  When I do an NSLOOKUP on my internal DNS it correctly resolve the name to the internal IP address.  (for testing it is the only DNS server I have)  However any mail program I try to send and receive mail from my internal network mail will fail to resolve the name.  I have shut down WINS so that there is no conflict in naming.
 
I have also noticed when using an external DNS server that if I try to send and receive mail from the internal network I get an ARP timeout (Source) 0.0.0.0  (Destination) 19.168.155.98  (my internal IP for mail) in my Sonicwall log files.
 
Anyone have any ideas.
 
Thanks for everyone's help on the list.
 

Kevin M. Donovan, MCSE
Network Support Specialist
IntelliWare Systems, Inc.
 
Phone (817) 277-0800 x228

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