New server setup at work - Now internet very intermittent

[Freakbro]

We have just had a small server installed (one of those HP Proliant Micro) and Windows Server 2008 R2 setup & installed by someone. Its only a small network with 3 pc's connected.

Ever since though the internet has been very....flakey. As in it can take ages to connect to a site or multiple attempts to even load a web page, usually with the "server at www.xxxxxxx" cannot be found - it took me 4 reloads to get here! Then it will work fine for a while.

Now I don't know a lot about server setups etc, but one thing I know he did was, he set up the server to be DHCP enabled. Then we set up reserved addresses on the router, so eg: the server is .100 the pcs .101->.103

But isn't this a problem that we have 2 things acting as DHCP servers? (The server itself and the router) I know on a previous thread when I added a 2nd router to my home network I was told double DHCPing is bad, or is it different when using servers?

Any other ideas what could be causing this? It must be to do with the server installation as it was an immediate change and very noticeable from how it was before. The server is set up as a domain level and the pc's now log into it on boot up.

 

[Deception]

From what ive been told before, like you said 2 DHCP sources are bad (even more so if they hand out same IP scope), even if one is a server and one is a router. So, you need to decide which you want to act as a DHCP server and disable the other one. Also, is your server set as a DNS server too or have any other roles?

 

[Freakbro]

From what ive been told before, like you said 2 DHCP sources are bad, even if one is a server and one is a router. Also, is your server set as a DNS server too?

Yes, the IP4 settings on the pc's are set manually to the HP server (.100) as the preferred DNS server

Hmm, if I start turning things off we will lose everything I just know it

But if we are sure this is what is doing it, I will have a go....