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DHCP is based on the earlier BOOTP protocol which uses well known port numbers for both server and client instead of an ephemeral port. The server and the client communicate via broadcast and the server broadcasts the offered IP address to the client on UDP port 68.
DHCP clients use the remote UDP port 67 for IPv4 and 547 for IPv6. If you are using the IP-based instead of port-based solution, exclude the broadcast address 255.255.255.255. Thanks! Ending the blocked range at 255.255.255.254 (rather than 255.255.255.255) did the trick. I still had to exclude the actual DHCP server as well.
Connect a cable from one of the LAN ports on router A to the WAN port on router B. Set Router B's WAN IP address to 192.168.1.51, and its internal LAN IP to 192.168.2.1. Tell it to hand out DHCP addresses on something like 192.168.2.2 through 192.168.2.50. Set the DNS settings on this router's DHCP to what you want for your kids.
Go to the 'Basic Setup' tab and click the 'DHCP Reservation' button. In the window that pops up, find your laptop and click the 'Select' box. Click the 'Add Clients' button. It will add that client to the list below. The IP address listed for that client will always be applied to that client. Then forward the ports as you need. Thanks for the ...
When a host sends a DHCP Discover (port 67, UDP), why don't all the hosts (except the DHCP server) reply with an ICMP 'port unreachable' message. This would cause a huge amount of useless data going through the network.
7. If your computer has static IP then the ipconfig /all will not show the DHCP server on your network. In this case you can use the following command line to display it. On my system, netsh dhcp show server gives the name of my domain controller.
I'm helping a friend migrate to a new Wi-Fi router at home, and find that his old router has port forwarding rules in place that route TCP/UDP traffic on external ports 67 & 68 to internal ports 67 & 68 of the router's IP address. I grasp that these are DHCP ports, and know that the router does act as DHCP server for his LAN.
6. I've noticed on some embedded linux systems that both dhcpcd and systemd-networkd leave the DHCP client port 68/udp open after the lease has been acquired. The fact both systems do this indicates it's a best practice if not a standard. The base DHCP standard does not require this: the handshake of DISCOVER-OFFER-REQUEST-ACK runs it's course ...
It is possible to install and run third-party DHCP server software on Windows, and there are several free and commercial DHCP server apps available if you search. Alternatively, the PC could run a virtual machine which provides DHCP services, e.g. regular Linux/BSD (or indeed even Windows Server) or specialized pfSense/RouterOS/etc.
The wifi router still gets the WAN IP address. But it seems like my ISP's DHCP server is no longer handing out an IP address to any ethernet-connected device, no matter if I plug the ethernet cable directly into the ONT or into a port in the switch. The mysterious part (at least to me) is that the wifi router is also a cabled device - it goes ...