![]() Packet sent with a source address of 1.1.1.1 This means the route 1.1.1.1 is not in R2’s routing table. ![]() Looking at the debug ip packet output on R2, we can see that packets to 1.1.1.1 are unroutable. In the below example R1 tries to ping R2 via it’s Loopback 0 interface. You may want to change the source-interface to verify proper routing. Source allows you to send a ping from any interface you want on the router.īy default ping will source its ping from the closest match in the routing table. One of the more useful options is source. Success rate is 100 percent (5/5), round-trip min/avg/max = 68/97/144 ms Sending 5, 1500-byte ICMP Echos to 10.1.1.2, timeout is 2 seconds: Sending 5, 2000-byte ICMP Echos to 10.1.1.2, timeout is 2 seconds: The MTU is the maximum size that a router will allow a packet to be for it to transmit.Īdditionally you can use the df-bit with your testing to prevent the routers from fragmenting the packet. This is useful for a variety of reasons, but at the CCNA level, the best use is making sure the downstream routers can support abnormal MTUs (Maximum Transmission Unit). You can also use the size option to set the size of the ping packet. Sending 100, 100-byte ICMP Echos to 10.1.1.2, timeout is 2 seconds: You can use the repeat option with the ping command to specify how many times the router will ping the remote host. Success rate is 80 percent (4/5), round-trip min/avg/max = 4/27/72 ms Sending 5, 100-byte ICMP Echos to 10.1.1.2, timeout is 2 seconds: If you ever see a single failure at the being of a ping that usually means the router hasn’t finished its ARP process for the destination. The ‘.‘ represents a failure and the ‘!‘ represents a success. In this example a user pings from R1 to R2. This is one of the most useful of the diagnogstic commands. ![]() Allows you to verify reachbility of a remote device.
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