What is the purpose of configuring a default gateway address on a host?

What is the purpose of configuring a default gateway address on a host?

The default gateway is the path used to pass information when the device doesn’t know where the destination is. More directly, a default gateway is a router that connects your host to remote network segments. It’s the exit point for all the packets in your network that have destinations outside your network.

How does a host locate the MAC address of it’s default gateway?

If the IP is within the subnet of the local machine, it uses ARP to determine the MAC address of the remote host. If it’s outside, it queries it’s local routing table to find the next hop of that IP, and sends out an ARP query to find the MAC address for that next hop.

Can ARP be used to find the physical address of a host with an IP address outside in the different network?

Proxy ARP. Proxy ARP enables a network proxy to answer ARP queries for IP addresses that are outside the network. When an ARP inquiry packet is broadcast, the routing table is examined to find which device on the LAN can reach the destination fastest.

Why do first ARP request packets normally have 00 00 00 00 00 00 as a target physical address?

And it target mac address is the UNKNOW (00:00:00:00:00). This is called “ARP Cache Validation” packet means ARP timeout has expired and switch wants to try the validation the same “is this ARP validate with the same IP”.

What will happen if the default gateway address is incorrectly configured on a host?

What will happen if the default gateway address is incorrectly configured on a host? The host cannot communicate with other hosts in the local network. Instead, the IP packet has to be sent to the router (default gateway) and the router will forward the packet toward its destination.

What happens if the default gateway of your host went down?

Realistically, the lack of a default gateway address means your computer will have no way of getting to the Internet. Secondly, most normal Internet configurations involve a single router, so the next “hop” for all of those entries would probably be the router that should be serving as a default gateway.

How does ARP find the hardware address of a host?

Note: ARP finds the hardware address, also known as Media Access Control (MAC) address, of a host from its known IP address. Let’s look at how ARP works.

Is the ARP table one to one for external IPS?

For each IP address there is a corresponding MAC address, and the owner responds to my broadcast ARP query. However, for external IPs, my ARP table is actually not one to one.

What is the ARP response/reply?

The IP address of the receiver. ARP response/reply: It is the MAC address response that the source receives from the destination which aids in further communication of the data. CASE-1: The sender is a host and wants to send a packet to another host on the same network. Use ARP to find another host’s physical address.

What type of protocol is used to resolve the MAC address?

If local, then it uses ARP to resolve the MAC address, if remote it uses ARP to resolve the MAC address of the default gateway. Then it sends the packet.

https://www.youtube.com/watch?v=sAKgfi0tZZM