为什么我的sis网卡有个好象是ipv6的地址？

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sis0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::240:26ff:fef3:b498%sis0 prefixlen 64 scopeid 0x1
        ether 00:e0:4c:a3:54:d9
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
奇怪吧:ask :ask

fe80::240:26ff:fef3:b498这是什么:ask :ask