50% of packets lost only on local interfaces

[Chris]

Have tested on 3 boxes.

5.3-STABLE compiled Jan 5th

--- 127.0.0.1 ping statistics ---
61 packets transmitted, 61 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.062/0.073/0.146/0.013 ms

5.3-STABLE amd64 build compiled Jan 29th

--- 127.0.0.1 ping statistics ---
60 packets transmitted, 60 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.024/0.030/0.048/0.005 ms

5.3-Release-P5

--- 127.0.0.1 ping statistics ---
60 packets transmitted, 60 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.057/0.089/0.167/0.017 ms

On Mon, 31 Jan 2005 19:12:52 +0100, José M. Fandiño <freebsd4 at fadesa.es> wrote:
> Hello,
> 
> It sounds weird but tcp/ip traffic directed to _local_ interfaces,
> and only _local_ interfaces, always cause 50% of packets lost. Of
> course there isn't packet filters activated.
> 
> I'm running -stable (the last update was this past weekend)
> 
> There is another report like this:
> http://www.FreeBSD.org/cgi/query-pr.cgi?pr=kern/72022
> but the suggested solution doesn't works in my case.
> 
> ping to local interfaces get replies for 50% of the packets:
> 
> > ping -c 512 127.0.0.1
> [snip]
> --- 127.0.0.1 ping statistics ---
> 512 packets transmitted, 257 packets received, 49% packet loss
> round-trip min/avg/max/stddev = 0.046/0.049/0.077/0.004 ms
> 
> > ping -c 512 10.20.30.2
> [snip]
> --- 10.20.30.2 ping statistics ---
> 512 packets transmitted, 254 packets received, 50% packet loss
> round-trip min/avg/max/stddev = 0.017/0.049/0.071/0.004 ms
> 
> Also running tcpdump on localhost shows as the kernel stop from
> responding to packets without an apparent motive.
> 
> > tcpdump -n -i lo0
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on lo0, link-type NULL (BSD loopback), capture size 96 bytes
> [snip]
> 17:58:15.516451 IP 127.0.0.1 > 127.0.0.1: icmp 64: echo request seq 76
> 17:58:15.516476 IP 127.0.0.1 > 127.0.0.1: icmp 64: echo reply seq 76
> 17:58:16.517321 IP 127.0.0.1 > 127.0.0.1: icmp 64: echo request seq 77
> 17:58:16.517347 IP 127.0.0.1 > 127.0.0.1: icmp 64: echo reply seq 77
> 17:58:17.518158 IP 127.0.0.1 > 127.0.0.1: icmp 64: echo request seq 78
> 17:58:18.519042 IP 127.0.0.1 > 127.0.0.1: icmp 64: echo request seq 79
> 17:58:19.519853 IP 127.0.0.1 > 127.0.0.1: icmp 64: echo request seq 80
> 17:58:20.520698 IP 127.0.0.1 > 127.0.0.1: icmp 64: echo request seq 81
> 17:58:21.521548 IP 127.0.0.1 > 127.0.0.1: icmp 64: echo request seq 82
> 17:58:22.522392 IP 127.0.0.1 > 127.0.0.1: icmp 64: echo request seq 83
> 
> more tests, to the lan router:
> 
> > ping -c 500 10.20.30.6
> [snip]
> --- 10.20.30.6 ping statistics ---
> 500 packets transmitted, 500 packets received, 0% packet loss
> round-trip min/avg/max/stddev = 1.565/2.015/40.189/2.385 ms
> 
> from the lan router:
> 
> Router#ping
> Protocol [ip]:
> Target IP address: 10.20.30.2
> Repeat count [5]: 500
> Datagram size [100]:
> Timeout in seconds [2]:
> Extended commands [n]:
> Sweep range of sizes [n]:
> Type escape sequence to abort.
> Sending 500, 100-byte ICMP Echos to 10.20.30.2, timeout is 2 seconds:
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!
> Success rate is 99 percent (498/500), round-trip min/avg/max = 1/2/12 ms
> 
> I don't find any explanation for this, but I'd like to know if there is
> any solution?
> 
> Thank you.
> 
> I put the whole test (dmesg, make.conf, etc)in this URL so you can see
> all numbers.
> http://195.55.55.164/tests/FreeBSD/report.txt
> 
> --
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