just for my memo.
Here are packet dumps of my Nexus 7 tablet connected to Wifi.
[ DNS queries ]
does not add EDNS0 option.
Android 4.4.2 ( Nexus 7 )
Domain Name System (query)
Transaction ID: 0x4602
Flags: 0x0100 Standard query
0... .... .... .... = Response: Message is a query
.000 0... .... .... = Opcode: Standard query (0)
.... ..0. .... .... = Truncated: Message is not truncated
.... ...1 .... .... = Recursion desired: Do query recursively
.... .... .0.. .... = Z: reserved (0)
.... .... ...0 .... = Non-authenticated data: Unacceptable
Questions: 1
Answer RRs: 0
Authority RRs: 0
Additional RRs: 0
Queries
www.bing.com: type A, class IN
Name: www.bing.com
Type: A (Host address)
Class: IN (0x0001)
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[ TCP SYN packet ]
Android 4.4.2 ( Nexus 7 )
enable window scaling and selective ack.. I didn’t know that.
Options: (20 bytes), Maximum segment size, SACK permitted, Timestamps, No-Operation (NOP), Window scale
Maximum segment size: 1460 bytes
Kind: MSS size (2)
Length: 4
MSS Value: 1460
TCP SACK Permitted Option: True
Kind: SACK Permission (4)
Length: 2
Timestamps: TSval 532510, TSecr 0
Kind: Timestamp (8)
Length: 10
Timestamp value: 532510
Timestamp echo reply: 0
No-Operation (NOP)
Type: 1
0... .... = Copy on fragmentation: No
.00. .... = Class: Control (0)
...0 0001 = Number: No-Operation (NOP) (1)
Window scale: 6 (multiply by 64)
Kind: Window Scale (3)
Length: 3
Shift count: 6
[Multiplier: 64]
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