Why does tcpdump show few packet?

Hello.
I try to use tcpdump, and don't filter any packets.
debian:/home/zhengda# tcpdump -i eth0
tcpdump: verbose output suppressed, use -v or -vv for full protocol
decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
23:46:36.611022 IP 222.205.2.248.netbios-dgm >
222.205.2.255.netbios-dgm: NBT UDP PACKET(138)

1 packets captured
250 packets received by filter
0 packets dropped by kernel

There are 250 packets received by filter, why only 1 packets is
captured. But there is no filter rule at all.
Why?

.

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