Cisco 800 modem/router issue

Hi I have a new Cisco 800 router.  Here is the scenario
Had Cisco 800 router provided by a ISP, all our email, web, everything was hosted by this ISP, we have a Sonicwall 2040 firewall.  We were given 2 public IPs, 1 - cisco 800, 1- sonicwall
NAT was stripped off of the router, so the sonicwall was handling all internet requests, 25, 110, 3389, 5631 ports were all being authorized by the sonicwall (sonicwall was in NAT Enabled Mode)....
NOW..... we have ended our agreement with that ISP and moved to a new ISP
We purchased the same Cisco 800 series router....New ISP give us a new static IP, now they only gave us 1 IP, they said we will not need 2!!?!??!?!?!
I had to reconfigure my soniwall (NAT with DHCP Client) !!??!?!  which got me wonidering, why the ISP told me to do it this way, but I went ahead and listened to them
now.... I have internet access in my network, am able to send email out external emails, but nothing is coming up, no external mail, to remote desktop, pc anywhere, I have reconfigured my dns servers with the new ISP dns servers,

When I tried to do a nslookup from home to my domain.  It pointed me to the old ISP, the mx records seem to be still pointing to the old ISP.

Would that have something to do with me not receiving external emails?

And what mode would the router have to be in?  Will I need to get 2 IP Addresses again from the new ISP so the firewall mode is NAT Enabled?

Pls help!

nutekconsultantsAsked:
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wingateslCommented:
With this setup there is no need for the sonicwall. configure the 800 for nat and firewalling and be done with it. as for the MX records, you will have to update your DNS records with whoever hosts them to point to the new IP address. To configure the 800 series the quick and easy way, use the SDM. http://www.cisco.com/go/sdm I have prepared a powerpoint to mike things easier her http://www.inacom-sby.com/sdm.ppt
Shawn
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nutekconsultantsAuthor Commented:
Shawn, thanks for the great help, I will try that out on Tuesday.

Another thing I shouldve noted in my first questions....

I have 3 sites, the site I am havign issues with is the Main Site, Site B and C are smaller sites, but all 3 have the same Cisco 800 Series, and all 3 sites have the Sonicwall 2040's.

Based on your reply, can the Cisco 800 series handle Site to Site VPNs?

Thanks,

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wingateslCommented:
I can definately handle them. They can even be configured with the SDM.
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nutekconsultantsAuthor Commented:
Just to confirm, the router is a Cisco 837
It does not have the SDM, it came with the CRWS  - cisco router web setup

How to I open ports on the router so PC ANywhere, Terminal Server are permitted into my LAN from outside


Thanks
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