New answers tagged ip
-1
votes
Why does a router need to have an IP assigned to be able to handle Proxy ARP?
ARP is a layer 3 protocol.
If a router doesn't have an IP address on an interface it functions as a L2 device forwarding frames based on L2 headers.
So, if an IP address isn't configured the router ...
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1
vote
Why does a router need to have an IP assigned to be able to handle Proxy ARP?
I just realized where the problem is.
Basically, when the router receives the ARP request from A to know the MAC address of the device with IP address of 4.4.4.4, the router is supposed to answer that ...
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8
votes
Why don't routers answer ARP requests for IP addresses they can handle even if they aren't assigned that IP address themselves?
As many have answered, the function to providing routing when an endstation is not aware of a router is called Proxy ARP. It used to be commonly enabled by routers, to provide service to ...
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2
votes
Why don't routers answer ARP requests for IP addresses they can handle even if they aren't assigned that IP address themselves?
Apparently someone did do that. Btw it's called Proxy ARP.
The linked youtube video also illustrates why you shouldn't do that. It's basically because you'd fill the ARP cache with more and more ...
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9
votes
Why don't routers answer ARP requests for IP addresses they can handle even if they aren't assigned that IP address themselves?
OK, so you have these (theoretical) options:
The TCP/IP way:
Any time I want to send a packet to a new IP not on the local network:
I lookup the IP of the default gateway (in the local routing table)...
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4
votes
Why don't routers answer ARP requests for IP addresses they can handle even if they aren't assigned that IP address themselves?
Let's say that we didn't have any default gateway ip address configured in the device that wants to send IP packets.
Without a route & gateway to the destination, a host can only drop the packet. ...
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8
votes
Accepted
Why don't routers answer ARP requests for IP addresses they can handle even if they aren't assigned that IP address themselves?
Let's say the router didn't have any IP address assigned either
The router would not be an IP router for that router interface because it would not know about the network directly connected to it. A ...
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