keepalive message or not?

[SB CH]

Hello,all.

So sorry,I corrected tcpdump result.
please re see my question.

I remote connected my server using ssh and executed like this.

# tcpdump tcp

and I can see so lots of packets like this.

09:43:22.517945 eth0 < client.56166 > server.ssh: . 3410978287:3410978287(0) ack 3409179220 win 33728 (DF) [tos 0x10]
09:43:22.517984 eth0 > server.ssh > client.56166: P 1:97(96) ack 0 win 10720 (DF)
09:43:22.518199 eth0 < client.56166 > server.ssh: . 0:0(0) ack 97 win 33728 (DF) [tos 0x10]
09:43:22.518242 eth0 > server.ssh > client.56166: P 97:201(104) ack 0 win 10720 (DF)
09:43:22.518445 eth0 < client.56166 > server.ssh: . 0:0(0) ack 201 win 33728 (DF) [tos 0x10]
09:43:22.519078 eth0 > server.ssh > client.56166: P 201:401(200) ack 0 win 10720 (DF)
09:43:22.519328 eth0 < server.56166 > client.ssh: . 0:0(0) ack 401 win 33728 (DF) [tos 0x10]
09:43:22.519377 eth0 > server.ssh > client.56166: P 401:561(160) ack 0 win 10720 (DF)
09:43:22.519602 eth0 < client.56166 > server.ssh: . 0:0(0) ack 561 win 33728 (DF) [tos 0x10]
09:43:22.519636 eth0 > server.ssh > client.56166: P 561:729(168) ack 0 win 10720 (DF)


* client is my pc name.

Surely, I didn't do anything except ssh login and just tcpdump.

Is this a keepalive message or not?

Please let me know the meaning about this message.

Thanks in advance.


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