We have a DNS problem with our SBS 2003 box. We have a single domain and single server which runs DHCP, Exchange and a variety of other things for about 8 PCs. The server has 2 NICs one which points internally to the network and the other which hooks into our router/firewall.
In the last 3 - 4 months we have had ever more frequent periods where the internet appears to drop out. This seems to happen randomly and more often than not is only brief 2-3 minutes before access appears to be restored. When this has happened I have logged onto the router and the WAN interface is still up. What alerted me to it being a DNS issue is last week when this happened again I manually changed my DNS settings on my laptop to be those of our ISP (as taken from our router) and had internet access while the other PCs did not.
Yesterday we had a proper internet outage which required a reset of all the hardware and since then the only way the PCs on the network can browse the internet is by them having the ISPs DNS servers manually added in the LAN connection. Also on the server we cannot send or receive email now unless the ISPs DNS servers are added to the external NIC connection. Previously they were never there and this may be the problem?
Basically what I would like to achieve is to have our server running DNS correctly so that PCs on our network do not require DNS settings to be manually added.
Any help is greatly appreciated.