It is very common to use it for internal networking. It is unlikely that using the 10.x.x.x subnet itself (other than the problems I have described above) has had anything to do with the failures. Changing your IP subnet may have temporarily fixed the problem because no one has assigned a static IP address from your DHCP pool.
If you are assigned an IP address by your DHCP server that is already taken by another computer then it is only a matter of time before you run into a problem like the one you described. Second, you may have an overlap with static and dynamic IP addresses. If you are NAT-ing the entire 10.x.x.x subnet, you could potentially be running into memory/caching issues because of the shear number of IP addresses that are being mapped - it could explain why rebooting temporarily solves the problem. If these tables become corrupt or are cleared, then you will experience problems since the association between real and virtual IP addresses will be broken. I resolved the problem by changing the internal network to 192.168.0.0."įirst, you may be experiencing a problem with the network address translation.
The problem was intermittent because it would just depend on which of the ISP servers we happen to connect through. One of the ISP's servers is configured to use the Class A 10.0.0.0 addresses and network address translation the others use real IP addresses. I found that the problem was caused by the dial-up networking connection to the ISP. Sometime the problem would go away without rebooting the server. Rebooting the server would fix the problem for a time, maybe 10 minutes, maybe a day. The server acts as the DHCP server and the PC's were using DHCP. We also found that sometimes the subnet masks of the PC's would change from 255.255.255.0 to 255.0.0.0. These requests were logged in the server event log. Intermittently the PC's would lose connection to the server and start broadcasting for a master browser reelection. The server has Microsoft Small Business Server 4.5 (Proxy Server) loaded. "The setup is a small network, 6 PC's and one server. Might the choice of network be the cause? Is this an acceptable practice?" Brad has been having problems with PCs on the network unexpectedly losing their connection. Brad39301 asks: "An ISP for one of my clients recently setup one of his dialup connection servers to use non-routable (gray) IP address in the reserved Class A 10.0.0.0 series.
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