Ping question

[Balgansuren Batsukh]

Hello,

I am using FreeBSD-6.2-PRERELEASE and when I ping to outside IP address get below result.

gk# ping y.y.y.y
PING y.y.y.y (y.y.y.y): 56 data bytes
64 bytes from y.y.y.y: icmp_seq=0 ttl=43 time=482.571 ms
64 bytes from y.y.y.y: icmp_seq=0 ttl=43 time=482.934 ms (DUP!)
64 bytes from y.y.y.y: icmp_seq=0 ttl=43 time=483.431 ms (DUP!)
64 bytes from y.y.y.y: icmp_seq=1 ttl=43 time=441.772 ms
64 bytes from y.y.y.y: icmp_seq=1 ttl=43 time=441.978 ms (DUP!)
64 bytes from y.y.y.y: icmp_seq=1 ttl=43 time=442.256 ms (DUP!)
64 bytes from y.y.y.y: icmp_seq=2 ttl=43 time=492.160 ms
64 bytes from y.y.y.y: icmp_seq=3 ttl=43 time=477.828 ms
64 bytes from y.y.y.y: icmp_seq=4 ttl=43 time=440.011 ms
64 bytes from y.y.y.y: icmp_seq=4 ttl=43 time=440.372 ms (DUP!)
64 bytes from y.y.y.y: icmp_seq=4 ttl=43 time=440.744 ms (DUP!)
64 bytes from y.y.y.y: icmp_seq=5 ttl=43 time=422.430 ms
64 bytes from y.y.y.y: icmp_seq=5 ttl=43 time=422.790 ms (DUP!)
64 bytes from y.y.y.y: icmp_seq=5 ttl=43 time=423.040 ms (DUP!)
64 bytes from y.y.y.y: icmp_seq=6 ttl=43 time=452.691 ms
64 bytes from y.y.y.y: icmp_seq=7 ttl=43 time=489.581 ms
64 bytes from y.y.y.y: icmp_seq=8 ttl=43 time=479.235 ms
64 bytes from y.y.y.y: icmp_seq=9 ttl=43 time=473.910 ms
64 bytes from y.y.y.y: icmp_seq=9 ttl=43 time=474.271 ms (DUP!)
64 bytes from y.y.y.y: icmp_seq=9 ttl=43 time=474.644 ms (DUP!)
64 bytes from y.y.y.y: icmp_seq=10 ttl=43 time=443.461 ms
64 bytes from y.y.y.y: icmp_seq=11 ttl=43 time=496.951 ms
64 bytes from y.y.y.y: icmp_seq=12 ttl=43 time=500.120 ms
64 bytes from y.y.y.y: icmp_seq=13 ttl=43 time=481.664 ms
64 bytes from y.y.y.y: icmp_seq=13 ttl=43 time=519.755 ms (DUP!)
64 bytes from y.y.y.y: icmp_seq=13 ttl=43 time=520.129 ms (DUP!)

Above result shows there some row has (DUP!) message. I don't know why there such message. Where can I get more detail information about it or it is error happen to NIC?

Also included below information too.

gk# uname -a
FreeBSD gk.magicnet.mn 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE #0: Fri Oct 13 00:1                                              4:07 ULAT 2006     balgaa at gk.boldsoft.mn:/usr/obj/usr/src/sys/GK  i386


gk# ifconfig -a
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        options=b<RXCSUM,TXCSUM,VLAN_MTU>
        inet x.x.x.x netmask 0xffffffe0 broadcast 80.237.106.159
        ether 00:0e:a6:30:39:8b
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
        inet 127.0.0.1 netmask 0xff000000

Regards,
Balgaa