正常的链路MTU=1500,如果是IPv4协议,MSS是1460,如果是IPv6协议,MSS是1440。
但是Linux默认会启用TIME_STAMP选项,占用12字节的TCP头,如果是IPv4协议,MSS是1448,如果是IPv6协议,MSS是1428。
checkmss.py通过建立TCP连接,然后获取内核中的TCP状态,显示 对方接收 和 我方接收的MSS。
ipv4.txt/ipv6.txt分别是一些网站的IPv4/IPv6结果(按照对方接收MSS排序)
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