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SBS 2003 Comcast SMC Modem unable to access FQDN internally

Posted on 2011-10-13
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Last Modified: 2012-05-12
I have an SBS 2003 server connected to a Comcast Business Class modem using the modem as a router. I have a domain record for our domain that points to our Static IP, mail.domain.com. From the outside I can go to a computer and type mail.domain.com and have access to OWA for exchange. When inside the network the firewall will not forward mail.domain.com address to the server. I'm guessing this has to do with the firewall but am not sure. Any ideas?

Other sites that i manage i use a Sonciwall for the firewall. The firewall rule allows you to forward port 80 requests from the LAN and the wan but It seems the SMC gateway doesn't allow this.
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Question by:cascadeit
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Expert Comment

by:sunnyc7
ID: 36964381
You have to talk to the Comcast guys to configure the modem / router to work in a bridge mode. Otherwise your firewall inside the network wont work.
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by:cascadeit
ID: 36964444
The comcast modem is the firewall. Currently I have the required ports set in the Comcast SMC gateway to forward to my server. Again from outside this works great but when trying to resolve internally to http://mail.domain.com/exchange doesn't work. Instead I have to use http://server/exchange to access OWA internally. I'd like it so the http://mail.domain.com/exchange works both internally and externally.
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by:sunnyc7
ID: 36964463
there are 2 ways you can do this:

a) Configure a nat policy on comcast firewall/modem, where for all requests for mail.domain.com - gets redirected to internal FQDN
b) open dnsmgmt.msc from your AD
configure a zone for domain.com
create a-record for mail.domain.com
assign it to internal LAN IP of Exchange

Option b) will work for windows users. If you have windows + mac, you'd rather do it with a nat policy
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by:cascadeit
ID: 36964488
Thanks, i will give your suggestions a try this weekend.
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sunnyc7 earned 500 total points
ID: 36964516
with a sbs - you can do it from the box itself.
Try the windows thing first

start > run > cmd > dnsmgmt.msc
Go to Forward Look Up zone
Rt click Create Zone- domain.com
and then a record on the right side > Rt Click Create A-record for mail.domain.com - and assign public IP

open start > run > Cmd from SBS
check if you ping mail.domain.com - you get a response from lan ip
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Author Closing Comment

by:cascadeit
ID: 36966238
Worked like a charm. Thank you!!!
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by:cascadeit
ID: 36966300
Hmm, now I can get to our website from inside at www.domain.com.
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Author Comment

by:cascadeit
ID: 36966450
Ok, just added *.domain.com and pointed it to my website IP address. All is good.
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