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Why was the first ping not successful?
The reason the first ping usually fails is that the remote router in that LAN has to put the ping request on hold to send out an ARP broadcast to learn the MAC address of the remote device, then wait for a response, and then send the first ping through. In this case, the first ping should always reply successfully.
Why do we get request timeout in the first time when we do ping?
But you cannot ping the IP address. The response “request timed out” is because your client sends the initial packet, waits for a reply (which will never come), and gives up at a preset timeout. Because it fails to connect to the host.
What is the ARP process?
Address Resolution Protocol (ARP) is a procedure for mapping a dynamic Internet Protocol address (IP address) to a permanent physical machine address in a local area network (LAN). The job of the ARP is essentially to translate 32-bit addresses to 48-bit addresses and vice-versa.
What causes ping to fail?
An improper TCP/IP setting causes a ping general failure. Ping is a valuable tool for troubleshooting all sorts of network or Internet problems. General Failure” appears if the computer doesn’t have the proper Internet protocol selected. You may select TCP/IPv4 or TCP/IPv6 in the control panel of your computer.
Why is my ping unsuccessful?
The reason the first ping usually fails is that the remote router in that LAN has to put the ping request on hold to send out an ARP broadcast to learn the MAC address of the remote device, then wait for a response, and then send the first ping through. This delay is usually too long.
Why is a ping unsuccessful?
Why does first Ping fail in Cisco router?
When you issue the first ping, the PC doesn’t know anything about the MAC address of the router, you are pinging, so it starts the ARP resolution process querying for the MAC address of the host with IP 172.16.0.1: 1. PC queries for the MAC address of host 172.16.0.1 – this is a broadcast packet sent to all hosts in the VLAN.
What happens when you Ping An IP address?
During the ARP resolution process, packets are discarded. However, this should not be happening for all newly pinged IP addresses in your case.
Why do I get a reply when I send a ping?
Depending on timers, the ping request may have timed out before the reply is received at the host. If you set the timeout value high enough for the ping, you should get a reply though. That is a result of the ARP resolution process.
How long does it take to Ping from router?
Stranger, if i ping directly from router : Sending 5, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds: !!!!! the most strange is when i delete all Inbound NAT rules for email server or web server, the first ping works fine 09-01-2011 05:26 AM 09-01-2011 05:26 AM