External DNS MX configurations settings conflict between MX, Exchange, external host provider, and Citrit server
Posted on 2013-05-12
We recently had a company contact us abuot not being able to send us email. They went through the process of using MX Toolset.
Upon which they found that kxxchemicals.com resolved to external ip address 70.42.x.161 (which is correct and configured on our sonicwall for smpt) but they also discovered another IP Address 70.42.x.163 was also resoving to kxxchemicals.com using data1.kxxchemicals.com; this is our Citrix server. All this makes since (pretty much). The problem here is that i dont not know how to correct it due to my current level of DNS internal/external routing and such.
This is the reason I got from our Network guy:
Data1 is an alias for 70.42.x.161. The purpose is to be able to host multiple sites with the same WAN IP (MX, Citrix etc…). This setup was there from the beginning. We need to review all DNS records and tell them what change you want them to make. You should tell them either point to IP address or alias. They will not know what you are talking about. All they know is making change to dns records.
I am able to cut/paste internal / external DNS, sonicwall settings, available ext ip addresses. I just need help on figuring out which open is best for our current situation and why?
I would also like to know where/how our Citrix server is showing up with a MX record, especially since it is not located on our current external DNS host company. Could it be that this is a left over entry from another host?