小弟用的是盛博的PC104，其网卡是NE2000兼容的，在VxWorks下通过修改config.h中的地址中断等参数已成功将其驱动起来了，可是当我在主机上ping目标机时，当包长<1472时可成功ping通，>1472就不行了，这是为什么？有什么设置吗？请各位大侠急救！！ 现象如下： ping 192.168.144.1 -t -l 1473 Pinging 192.168.144.1 with 1473 bytes of data: Request timed out. Request timed out. Request timed out. Request timed out. ping 192.168.144.1 -t -l 1472 Pinging 192.168.144.1 with 1472 bytes of data: Reply from 192.168.144.1: bytes=1472 time<10ms TTL=64 Reply from 192.168.144.1: bytes=1472 time<10ms TTL=64 Reply from 192.168.144.1: bytes=1472 time<10ms TTL=64 [em01][em01]