ping & DUP!

Народ, подскажите, почему на wireless канале встречается такая бяка?
Windows-машина:
ping 172.10.0.4
PING 172.10.0.4 (172.10.0.4) 56(84) bytes of data.
64 bytes from 172.10.0.4: icmp_seq=1 ttl=127 time=3.87 ms
64 bytes from 172.10.0.4: icmp_seq=2 ttl=127 time=7.84 ms
64 bytes from 172.10.0.4: icmp_seq=3 ttl=127 time=5.01 ms
64 bytes from 172.10.0.4: icmp_seq=4 ttl=127 time=4.77 ms
64 bytes from 172.10.0.4: icmp_seq=5 ttl=127 time=3.64 ms
64 bytes from 172.10.0.4: icmp_seq=6 ttl=127 time=33.5 ms
64 bytes from 172.10.0.4: icmp_seq=6 ttl=127 time=34.6 ms (DUP!)
64 bytes from 172.10.0.4: icmp_seq=6 ttl=127 time=35.7 ms (DUP!)
64 bytes from 172.10.0.4: icmp_seq=7 ttl=127 time=3.60 ms
64 bytes from 172.10.0.4: icmp_seq=8 ttl=127 time=16.6 ms
64 bytes from 172.10.0.4: icmp_seq=8 ttl=127 time=19.4 ms (DUP!)
64 bytes from 172.10.0.4: icmp_seq=8 ttl=127 time=22.5 ms (DUP!)
64 bytes from 172.10.0.4: icmp_seq=8 ttl=127 time=25.1 ms (DUP!)
64 bytes from 172.10.0.4: icmp_seq=9 ttl=127 time=5.60 ms
64 bytes from 172.10.0.4: icmp_seq=10 ttl=127 time=5.28 ms
64 bytes from 172.10.0.4: icmp_seq=11 ttl=127 time=5.34 ms
64 bytes from 172.10.0.4: icmp_seq=12 ttl=127 time=3.52 ms
64 bytes from 172.10.0.4: icmp_seq=13 ttl=127 time=10.9 ms
64 bytes from 172.10.0.4: icmp_seq=14 ttl=127 time=5.46 ms
64 bytes from 172.10.0.4: icmp_seq=15 ttl=127 time=31.5 ms
64 bytes from 172.10.0.4: icmp_seq=15 ttl=127 time=34.3 ms (DUP!)

хотя, есть точка, которая пингуентся без DUP-ов (Linux-машина)...
ping 172.10.0.16
PING 172.10.0.16 (172.10.0.16) 56(84) bytes of data.
64 bytes from 172.10.0.16: icmp_seq=1 ttl=254 time=3.00 ms
64 bytes from 172.10.0.16: icmp_seq=2 ttl=254 time=2.39 ms
64 bytes from 172.10.0.16: icmp_seq=3 ttl=254 time=2.47 ms
64 bytes from 172.10.0.16: icmp_seq=4 ttl=254 time=2.36 ms
64 bytes from 172.10.0.16: icmp_seq=5 ttl=254 time=3.59 ms
64 bytes from 172.10.0.16: icmp_seq=6 ttl=254 time=3.25 ms
64 bytes from 172.10.0.16: icmp_seq=7 ttl=254 time=3.01 ms
64 bytes from 172.10.0.16: icmp_seq=8 ttl=254 time=2.48 ms
64 bytes from 172.10.0.16: icmp_seq=9 ttl=254 time=2.44 ms
64 bytes from 172.10.0.16: icmp_seq=10 ttl=254 time=2.40 ms
64 bytes from 172.10.0.16: icmp_seq=11 ttl=254 time=2.96 ms
64 bytes from 172.10.0.16: icmp_seq=12 ttl=254 time=3.52 ms