We have ~20 employees with 20 computers. We have a domain based network with DHCP providing the workstations with IP addresses.
My internal DNS is 192.168.11.6
My first router is 192.168.11.19 (cheapo linksys vpn/router)
The WAN side of this router is 192.168.1.19
It points to the AT&T Netopia modem 192.168.1.110
My mail server connects directly to the netopia 192.168.1.2
Netopia had 5 static IPs on its public side. Some of which map through (to the mail server for example). It is regular DSL.
I'm not convinced this is the best way of doing this. But I don't know where to start on getting replacement equipment. It gets very bogged down as more users get on the internet and I doubt the security is particularly strong.
Where should I start?