20% packet loss affects performance?

35 pts.
Tags:
3Com
Networking
Routers
Hi. I've been noticed that I have some packet loss when I do ping from our 3Com router 5642 to the default gateway of our provider. <codinet03>ping 10.162.66.185 PING 10.162.66.185: 56 data bytes, press CTRL_C to break Reply from 10.162.66.185: bytes=56 Sequence=1 ttl=255 time=3 ms Reply from 10.162.66.185: bytes=56 Sequence=2 ttl=255 time=1 ms Request time out Reply from 10.162.66.185: bytes=56 Sequence=4 ttl=255 time=2 ms Reply from 10.162.66.185: bytes=56 Sequence=5 ttl=255 time=1 ms --- 10.162.66.185 ping statistics --- 5 packet(s) transmitted 4 packet(s) received 20.00% packet loss round-trip min/avg/max = 1/1/3 ms We did the last mile between our provider and us and once I called them because I felt network slow. They told me that could be the packet loss (20%) that make the Internet slow and I should verify this. Is really a 20% of packet loss that ocurrs sometimes, a major problem for our Internet conection?? Thanks in advanced

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Absolutely…. 1% packet loss can create major issues on a connection due to the TCP backoff algorithm. This means that packet retransmits and window updates have to happen. Both of these reduce network throughput. Run pathping on a Windows XP or above box to see where the packet loss is happening along the path. Then talk to the responsible parties between those two points.

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  • petkoa
    I'll agree with Labnuke99, you situation is quite serious. Recently, due to a LAN switch failure some PCs got 0% pings lost with standard packets (bytes=56) and ~20% with 1024 b packets (ping -t -l 1024 some.host.name) and this led to a major user "under-satisfaction"... BR, Petko
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  • Cabo81
    Sorry for the late, late post. Yes, we could solve the problem, due to hardware error. Now the problem is solved. Thanks
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