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Groups > comp.os.linux.networking > #589
| From | "homer" <2556invalid@webuse.net> |
|---|---|
| Newsgroups | comp.os.linux.networking |
| Subject | Duplicate packets in ping |
| Message-ID | <201109151953122556@webuse.net> (permalink) |
| Date | 2011-09-15 19:53 +0000 |
I was pinging some host from my computer connected to a wireless network, and I noticed this: 64 bytes from 8.8.8.8: icmp_req=61 ttl=52 time=73.3 ms 64 bytes from 8.8.8.8: icmp_req=62 ttl=52 time=74.7 ms 64 bytes from 8.8.8.8: icmp_req=63 ttl=52 time=76.3 ms 64 bytes from 8.8.8.8: icmp_req=63 ttl=52 time=76.8 ms (DUP!) 64 bytes from 8.8.8.8: icmp_req=63 ttl=52 time=77.4 ms (DUP!) 64 bytes from 8.8.8.8: icmp_req=63 ttl=52 time=78.0 ms (DUP!) 64 bytes from 8.8.8.8: icmp_req=64 ttl=52 time=71.1 ms 64 bytes from 8.8.8.8: icmp_req=65 ttl=52 time=75.2 ms 64 bytes from 8.8.8.8: icmp_req=66 ttl=52 time=71.0 ms 64 bytes from 8.8.8.8: icmp_req=67 ttl=52 time=71.0 ms 64 bytes from 8.8.8.8: icmp_req=68 ttl=52 time=78.8 ms 64 bytes from 8.8.8.8: icmp_req=68 ttl=52 time=82.2 ms (DUP!) 64 bytes from 8.8.8.8: icmp_req=69 ttl=52 time=83.9 ms 64 bytes from 8.8.8.8: icmp_req=70 ttl=52 time=73.7 ms 64 bytes from 8.8.8.8: icmp_req=72 ttl=52 time=72.0 ms 64 bytes from 8.8.8.8: icmp_req=73 ttl=52 time=71.2 ms 64 bytes from 8.8.8.8: icmp_req=74 ttl=52 time=72.4 ms 64 bytes from 8.8.8.8: icmp_req=76 ttl=52 time=76.0 ms 64 bytes from 8.8.8.8: icmp_req=77 ttl=52 time=83.3 ms 64 bytes from 8.8.8.8: icmp_req=77 ttl=52 time=84.3 ms (DUP!) 64 bytes from 8.8.8.8: icmp_req=77 ttl=52 time=85.6 ms (DUP!) 64 bytes from 8.8.8.8: icmp_req=78 ttl=52 time=77.1 ms Now my question is: even with a dodgy network connection, or one with high latency, how is it possible that duplicate packets appear in ICMP? My understanding of ICMP echo request/reply is that neither party ever tries to resend a packet (and, I suppose, none of the intermediate dvices). So while I understand how packets can be _missing_, where may those duplicates be coming from? Thanks, Posted using www.webuse.net
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Duplicate packets in ping "homer" <2556invalid@webuse.net> - 2011-09-15 19:53 +0000 Re: Duplicate packets in ping Robert <rkarlsson@gmail.com> - 2011-09-16 02:58 -0700 Re: Duplicate packets in ping Karthik Bharadwaj <kbforfb@yahoo.com> - 2011-09-16 15:23 -0600
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