Contents
Do Routers send broadcast packets?
Generally speaking, routers will unicast-forward incoming packets which have a network broadcast address as destination, unless they are directly connected to that network/subnet and therefore know that the destination address is a broadcast address.
What is the protocol for router?
Router protocols include: Interior Gateway Protocol (IGRP) Open Shortest Path First (OSPF) Exterior Gateway Protocol (EGP) Enhanced Interior Gateway Routing Protocol (EIGRP)
What is normally used by a router to make decisions when routing packets?
A primary function of a router is to forward packets toward their destination. This is accomplished by using a switching function, which is the process used by a router to accept a packet on one interface and forward it out another interface.
How do I send a broadcast packet?
on some systems, you have to enable the sending of broadcast packet by setting the SO_BROADCAST socket option to 1, using setsockopt() . then use the sendto() function call to send a datagram, and use 255.255. 255.255 as the destination address.
Can a router forward a network broadcast address?
Generally speaking routers will not forward incoming packets which have the network broadcast address as destination. You may want to add some precision or context to that statement. It is only true for routers that have an interface into that subnet and thus know that what the network broadcast address of that subnet happens to be.
How does a router forward packets inside a LAN?
Even a broadcast IP has a broadcast MAC address. ARP has one job, to find the MAC address for an IP address. If the ARP cache does not have an entry for an IP, then it uses a ARP broadcast to find it. Routing tables are used to find the next hop IP.
Where does a broadcast IP address go in a network?
Technically, this broadcast should be sent to all the IP addresses that exist. However, it actually serves as an address for the broadcast within the network. This destination is always in its own network and can therefore be implemented in an Ethernet broadcast.
Do you forward packets to the destination network?
Don’t forward packets of which you know they will be a broadcast on the destination network. A host on 10.0.0.0/24 knows that 10.0.0.255/24 will usually be the network broadcast. It will set the destination Ethernet address to the address defined as broadcast, which is all FF.