DHCP service subnet mask allocation

Q: I use ADSL broadband Internet access, use the router and then connect a 16-port exchange (DHCP assigned IP), recently several servers are always LAN but can not Go online, use the Ping command and find that the IP and gateway are correct. Only the subnet mask is different, which is 255.0.0.0. These computers that are not connected to the LAN are all in the same situation. What if the problem is solved?
A: The subnet masks are different from each other. Your problem is that DHCP does not correctly assign an IP address to a computer on the LAN. This should be caused by your DHCP settings being incorrect. First, the DHCP server must have a static address, and the subnet mask should be what you need (255.255.255.0 in the text). When creating the scope, you must correctly set the assigned address range and subnet mask. , gateway, DNS and other parameters. Please check the DHCP server or router on your network (if you use its DHCP service function) to see if the settings are correct. In addition, check if there are other DHCP servers in the network, and if there are other DHCP servers (turn off the DHCP you are using now, see if the DHCP client can get the address, if yes, there are other DHCP servers. ).