why dhcp has two ports?
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BOOTP and DHCP are defined to use UDP broadcast packets in the general case, so that the clients can receive server responses without having actual IPs. ... The reason TWO reserved ports are used, is to avoid 'waking up' and scheduling the BOOTP server daemons, when a bootreply must be broadcast to a client.
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1 Answer. Yes it can, but you must tell the client to use another port (the client can not figure out the port itself automatically).
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Because web servers operate on TCP port 80, both of these sockets are TCP sockets, whereas if you were connecting to a server operating on a UDP port, both the server and client sockets would be UDP sockets.
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Brief Introduction: DHCP and DNS. DHCP and DNS are two essential services in IT networks. While a DHCP server sends out information that clients need to communicate with other machines and services, DNS ensures that servers, clients, and services can be found by their names.
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As you can see, port 21 is for client connecting to servers and port 20 is for servers connecting to clients, but those clients could still serve files on 21.
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DHCP IP Helper addresses are IP addresses configured on a routed interface such as a VLAN Interface or a routers Ethernet interface that allows that specific device to act as a “middle man” which forwards BOOTP (Broadcast) DHCP request it receives on an interface to the DHCP server specified by the IP Helper address ...
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It means that another device on your LAN has the same address as you do. This means that either you have a very bad DHCP setup or addresses on your network are set manually and someone set the same address as you have.
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DHCP is an abbreviation for Dynamic Host Configuration Protocol. It is an application layer protocol used by hosts for obtaining network setup information. The DHCP is controlled by DHCP server that dynamically distributes network configuration parameters such as IP addresses, subnet mask and gateway address.
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1 Answer. Most often when I see this kind of DHCP-not-updating DNS behavior, it is because the credentials that DHCP uses to do the updates have a problem. To access the credentials screen - Open up DHCP, right click IPv4 protocol, select the "Advanced Tab", and then the "Credentials" button.
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Routers are special because they have two IP addresses. An IP address is assigned to each of the router's two “interfaces”. The first router interface is called the WAN (Wide Area Network) interface. This is the side of the router that faces the Internet and has a public IP address.
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Dynamic Host Configuration Protocol (DHCP) automatically assigns IP addresses and other network configuration information (subnetmask, broadcast address, etc) to computers on a network. A client configured for DHCP will send out a broadcast request to the DHCP server requesting an address.
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255.0 ; A subnet declaration is required for every network your DHCP server is serving. Multiple subnets require multiple subnet declarations. If the DHCP server does not have a network interface in a range of a subnet declaration, the DHCP server does not serve that network.
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A DHCP scope is an administrative grouping of IP addresses for a network subnet. With scopes you can configure common network settings for all clients receiving addresses, such as DNS servers and network gateways.
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The use of an well known port (in our case 68) prevents the use of the same two destination port numbers and hence it prohibits other protocols from using the same port which is already in use by another protocol. In simple words, it prevents an application from getting a message from a completely different protocol.
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It means that another device on your LAN has the same address as you do. This means that either you have a very bad DHCP setup or addresses on your network are set manually and someone set the same address as you have. Originally Answered: What does it mean when my computer says someone is using my IP address?
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Dynamic Host Configuration Protocol Via Router To clarify, under the General Setup or LAN Setup tab in most routers, there is a setting option for DHCP. ... If this option is disabled, an IP address will have to be statically assigned to each computer, or have a DHCP server on the network. This goes for wired and wireless.
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Dynamic host configuration protocol (DHCP) still assigns dynamic addresses for IPv4 networks, but two newer protocols – SLAAC and DHCPv6 – are vying to do the job for IPv6. ... To complicate matters, a new DHCP – DHCPv6 – that performs the same function as SLAAC was independently created for IPv6.