What causes ping DUP?
DUP means duplicate packet. From man ping : Duplicate and Damaged Packets ping will report duplicate and damaged packets. Duplicate packets should never occur, and seem to be caused by inappropriate link-level retransmissions.
How do you ping packets?
In Windows, hit Windows+R. In the Run window, type “cmd” into the search box, and then hit Enter. At the prompt, type “ping” along with the URL or IP address you want to ping, and then hit Enter.
Does pinging send packets?
Ping works by sending an Internet Control Message Protocol (ICMP) Echo Request to a specified interface on the network and waiting for a reply. When a ping command is issued, a ping signal is sent to a specified address. When the target host receives the echo request, it responds by sending an echo reply packet.
What mean TTL in ping?
Time To Live
The TTL field, Time To Live, of an IP packet represents the maximum number of IP routers that the packet can go through before being discarded. During normal operation, ping prints the TTL value for every packet it receives.
What is DUP packet?
DUP means duplicate packet. From man ping : Duplicate and Damaged Packets. ping will report duplicate and damaged packets. Duplicate packets should never occur, and seem to be caused by inappropriate link-level retransmissions.
What means duplicate packets?
Duplicate packets lower the statistical accuracy of analysis, increase network link saturation, and can interfere with tools. Packet deduplication removes duplicate packets and helps you avoid those situations. A duplicate packet is any packet that is identical to another packet.
What is ICMP ping packet?
Internet Control Message Protocol (ICMP) is used to send control messages to network devices and hosts. The program ping is one program that uses ICMP to determine whether a system is connected to the Internet (it uses the ICMP messages Echo Request and Echo Reply).
How do I ping 1000 packets?
Type ping -f -l 1000 and press Enter. Note the addition of the -f option to prevent fragmentation of the packet.
What is the difference between ICMP and ping?
ICMP is a protocol for sending various messages to report network conditions—it is not ping. The echo request is one of many messages. Ping can be filtered out, but the majority of ICMP message types are required for proper operation of IP, TCP and other protocols.
What causes duplicate packets in network?
Typically, duplicates are a result of how data is sent to Observer . If a SPAN/mirror port is configured to send both ingress (in) and egress (out) data from multiple ports, any communication between any two ports being monitored results in a duplicate packet.
Why are there duplicate packets in my Ping?
ping will report duplicate and damaged packets. Duplicate packets should never occur, and seem to be caused by inappropriate link-level retransmissions. Duplicates may occur in many situations and are rarely (if ever) a good sign, although the presence of low levels of duplicates may not always be cause for alarm.
What are duduplicates and damaged packets?
Duplicates may occur in many situations and are rarely (if ever) a good sign, although the presence of low levels of duplicates may not always be cause for alarm. Damaged packets are obviously serious cause for alarm and often indicate broken hardware somewhere in the ping packet’s path (in the network or in the hosts).
What causes duplicate packets to be sent?
This is usually caused by faulty networks. Wireless networks often rely on re-sending packets if they don’t get proper verification, and if the first one actually worked, the re-send will be a duplicate. In normal usage duplicates are discarded. In ping replies they are noted because they tell you something about how the network is functioning.
What does it mean when ICMP packets are duplicated?
Sometimes this is the reason for dupplicated packets. It means the reply packet is a duplicate. ICMP responses contain a sequence number. Sometimes you’ll actually get more than one reply with the same sequence number. This is usually caused by faulty networks.
