wireshark資料抓包軟體，在抓包過程中的三次握手的ack是一樣的嗎？而seq初始為x?

ACK num 不一樣，Seq num 隨機生成，不為 0 。

When new connections are created， an initial sequence number （ISN） generator is employed which selects a new 32 bit ISN。 The generator is bound to a （possibly fictitious） 32 bit clock whose low order bit is incremented roughly every 4 microseconds。 Thus， the ISN cycles approximately every 4。55 hours。