[FS#963] chips is qca9531, pc ping device ip fail or timeout with big size, exp: ping 192.168.1.1 -l 65500

[LEDE Bugs]

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FS#963 - chips is qca9531, pc ping device ip fail or timeout with big size, exp: ping 192.168.1.1 -l 65500
User who did this - jiangyaohui (jiangyaohui)

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Christian Lamparter:
    I use Windows to send the ping command, the command is same as Linux "ping 192.168.1.1 -s 65500";
    ping the size 56710 OK;
    ping the size 56720 timeout sometimes;
    ping the size 65500 timeout always;
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