Re: [Agnx80211driver-devel] tcpdump report access google with delay mode via ethernet

[YanBo <dre...@gm...>]

On Dec 23, 2007 12:45 PM, far seer <se...@gm...> wrote:
> YanBo,
> Below is tcpdump report, though google does not send fin package after three
> handshake.
>
> 12:41:19.157286 IP 192.168.1.122.50637 > jp-in-f147.google.com.http: S
> 2707899440:2707899440(0) win 5840 <mss 1460,sackOK,timestamp 500377
> 0,nop,wscale 4>
> 12:41:19.267147 IP jp-in-f147.google.com.http > 192.168.1.122.50637: S
> 3578420469:3578420469(0) ack 2707899441 win 5672 <mss 1430,sackOK,timestamp
> 3714633827 500377,nop,wscale 6>
> 12:41:19.267183 IP 192.168.1.122.50637 > jp-in-f147.google.com.http: . ack 1
> win 365 <nop,nop,timestamp 500487 3714633827>
> 12:41:20.267347 IP 192.168.1.122.50637 > jp-in-f147.google.com.http: P
> 1:32(31) ack 1 win 365 <nop,nop,timestamp 501487 3714633827>
> 12:41:20.377030 IP jp-in-f147.google.com.http > 192.168.1.122.50637: . ack
> 32 win 89 <nop,nop,timestamp 3714634938 501487>
> 12:41:20.419030 IP jp-in-f147.google.com.http > 192.168.1.122.50637: .
> 1:1419(1418) ack 32 win 89 <nop,nop,timestamp 3714634974 501487>
> 12:41:20.419041 IP 192.168.1.122.50637 > jp-in-f147.google.com.http: . ack
> 1419 win 546 <nop,nop,timestamp 501639 3714634974>
> 12:41:20.424256 IP jp-in-f147.google.com.http > 192.168.1.122.50637: .
> 1419:2837(1418) ack 32 win 89 <nop,nop,timestamp 3714634974 501487>
> 12:41:20.424291 IP 192.168.1.122.50637 > jp-in-f147.google.com.http: . ack
> 2837 win 727 <nop,nop,timestamp 501644 3714634974>
> 12:41:20.428219 IP jp-in-f147.google.com.http > 192.168.1.122.50637: P
> 2837:4255(1418) ack 32 win 89 <nop,nop,timestamp 3714634974 501487>
> 12:41:20.428249 IP 192.168.1.122.50637 > jp-in-f147.google.com.http: . ack
> 4255 win 908 <nop,nop,timestamp 501648 3714634974>
> 12:41:20.532164 IP jp-in-f147.google.com.http > 192.168.1.122.50637: .
> 4255:5673(1418) ack 32 win 89 <nop,nop,timestamp 3714635087 501639>
> 12:41:20.532218 IP jp-in-f147.google.com.http > 192.168.1.122.50637: FP
> 5673:5675(2) ack 32 win 89 <nop,nop,timestamp 3714635087 501639>
> 12:41:20.532279 IP 192.168.1.122.50637 > jp-in-f147.google.com.http : . ack
> 5673 win 1089 <nop,nop,timestamp 501752 3714635087>
> 12:41:20.532380 IP 192.168.1.122.50637 > jp-in-f147.google.com.http: F
> 32:32(0) ack 5676 win 1089 <nop,nop,timestamp 501752 3714635087>
> 12:41: 20.643053 IP jp-in-f147.google.com.http > 192.168.1.122.50637: . ack
> 33 win 89 <nop,nop,timestamp 3714635203 501752>
>
>
Hi far.
For the agnx card, google send fin packet because after finished three
handshake,  it wait for a while but still can't receive the http
request from the client, so it think this tcp session is timeout,
hence it sent the fin packet to terminal this tcp session, but in
above situation google get the correctly http request after three
handshake, so it will not send fin packet.

lyb