Difference between revisions of "Talk:Ping"
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Revision as of 20:55, 12 July 2024
Why am I seeing DUP! when using ping on a linux machine with WiFi adapter?
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. 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. For example, if you are getting 100% duplicates some fault detection mechanism is likely broken.
