4 ms·
> they may arrive out of order, be duplicated, or not arrive at all! This is first time what I read that datagram can be duplicated. Is it true? It's duplicat
by milansuk 10y ago
> they may arrive out of order, be duplicated, or not arrive at all!
This is first time what I read that datagram can be duplicated. Is it true? It's duplicated by network or does it mean that peer send it again?
- noway421 10y agoPackets can be duplicated by faulty routers and loops in the topology. Happens all the time to me when I'm lost with iptables.
- ra1n85 10y agoObserved this recently with a bug in Cisco's VSS. Some packets were being duplicated, which destroyed TCP throughput.
- azdle 10y agoIt can also be "duplicated" if you have some sort of acknowledge and retransmission on top of UDP itself. If the ack gets lost on the way back to the original sender it'll send another (probably) identical packet.
- simplehuman 10y agoAt network level, this is common for broadcast addresses. And also if a switch floods the packet across all its interfaces if it cannot make a routing decision. At app level, this is because the app decided to retry I.e app logic.
- sytelus 10y agoA classic example is FPV video from drone. There may be reflections in surroundings and you may get packets multiple times!
- other_herbert 10y agoRight or a problem in something that could retransmit your packet again.. I did that in my office in the early 00s and took down a 100mbps lan from a few boxes retransmitting packets that weren't meant for them <eg>
- scurvy 10y agoIt's very common for netflow data to be mirrored and multiplexed. Syslog, too.