External DNS Resolution Issue
Posted on 2006-06-22
Linkysys Router -> Small Business Server 2003 -> Client PCs
Switched a client over to using their exchange server as their external mail server yesterday. I also switch the domain registration to point MX record to the exchange server through a Linkysys Router on which I opened port 25 for the SMTP communication. I also switched the location of their web page hosting site.
I've been monitoring the propagation. I have a different ISP at home than at the office. Mine propagated last night and has been good since. I sent test mail from my home office last night and it made it to my test user on their exchange server fine. Also from the test user to my external mail account.
My office and the clients office have the SBS 2003 Domain setup outline above using a small Linksys router for the Gateway. Since my home office worked last night I tried pinging from my office at work all day. Still have not gotten the server to pick up the correct dns from our ISP. Problem I have with this is, if I manually switch the dns server on my network connection on my client pc to use the router instead of the server for DNS, I ping both the new mail address and the new web host address, and it give me the correct ip address. Also if i try to go to the new web site, it works as well.
So, I think this tells me that my ISP DNS servers have the correct info, but my server is not getting the correct dns information from them. I have the ISP DNS servers configured on my server. I have tried running "ipconfig /flushdns" and "dnscmd /clearcache" at the command prompt of the server, and the ipconfig /flushdns at the client pc level.
I don't care so much about my server, but my client's have the same External DNS Server as we do. Their office is right next door. I have done the same steps on their server with the same results. The only thing I have not done at their office is manually configuring the network connection on a client pc. I'm going to assume the same results because, again we both have the same ISP DNS servers.
Any other ideas to try to get the server to update DNS properly? Thanks