GPRS在IPCP协商之后的这一帧是什么帧？
GPRS端：7E 80 21 01 07 00 16 03 06 00 00 00 00 81 06 00 00 00 00 83 06 00 00 00 00 66 F8 7E
C I L D
GGSN端：7E 80 21 03 07 00 16 03 06 [0A 44 C5 37] 81 06 [D3 88 70 32] 83 06 [D3 88 14 CB] 74 F0 7E
C I L D
GPRS端：7E 80 21 01 08 00 16 03 06 [0A 44 C5 37] 81 06 [D3 88 70 32] 83 06 [D3 88 14 CB] AA 9D 7E
C I L D
GGSN端：7E 80 21 02 08 00 16 03 06 [0A 44 C5 37] 81 06 [D3 88 70 32] 83 06 [D3 88 14 CB] 5C 6E 7E
C I L D
GPRS端：7E 21 46 00 00 28 5A 1E 00 00 01 02 1B 20 0A 44 C5 37 E0 00 00 16 94 04 00 00 22 00 EA 03 00 00 00 01
C I L D
04 00 00 00 EF FF FF FA 35 C4 7E
即：在得到GGSN分配的IP地址之后[]中的即是IP地址，GPRS发送了7E 21 46...的数据包，我拿IP对D(信息域)分析时，IP地址对不上。从网络上查找说是IPCP压缩。那既然是压缩了，Code=46咋解释？IPCP中没有这个Code呀？
我这里的数据是从XP的GPRS猫拨号是从串口截获来的，想分析一下GPRS拨号过程。
那位有经验的帮小弟看看，指点一下。
[解决办法]
协议为IGMP协议，具体如下：
No. Time Source Destination Protocol Info
1 0.000000000 10.68.197.55 224.0.0.22 IGMP V3 Membership Report / Join group 239.255.255.250 for any sources
Frame 1 (54 bytes on wire, 54 bytes captured)
Arrival Time: Jan 1, 2000 09:23:00.607375000
[Time delta from previous captured frame: 0.000000000 seconds]
[Time delta from previous displayed frame: 0.000000000 seconds]
[Time since reference or first frame: 0.000000000 seconds]
Frame Number: 1
Frame Length: 54 bytes
Capture Length: 54 bytes
[Frame is marked: False]
[Protocols in frame: eth:ip:igmp]
[Coloring Rule Name: Routing]
[Coloring Rule String: hsrp || eigrp || ospf || bgp || cdp || vrrp || gvrp || igmp || ismp]
Ethernet II, Src: 04:00:04:00:00:00 (04:00:04:00:00:00), Dst: 6a:3a:20:00:04:00 (6a:3a:20:00:04:00)
Destination: 6a:3a:20:00:04:00 (6a:3a:20:00:04:00)
Address: 6a:3a:20:00:04:00 (6a:3a:20:00:04:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
Source: 04:00:04:00:00:00 (04:00:04:00:00:00)
Address: 04:00:04:00:00:00 (04:00:04:00:00:00)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
Type: IP (0x0800)
Internet Protocol, Src: 10.68.197.55 (10.68.197.55), Dst: 224.0.0.22 (224.0.0.22)
Version: 4
Header length: 24 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 40
Identification: 0x5a1e (23070)
Flags: 0x00
0... = Reserved bit: Not set
.0.. = Don't fragment: Not set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 1
Protocol: IGMP (0x02)
Header checksum: 0x1b20 [correct]
[Good: True]
[Bad : False]
Source: 10.68.197.55 (10.68.197.55)
Destination: 224.0.0.22 (224.0.0.22)
Options: (4 bytes)
Router Alert: Every router examines packet
Internet Group Management Protocol
IGMP Version: 3
Type: Membership Report (0x22)
Header checksum: 0xea03 [correct]
Num Group Records: 1
Group Record : 239.255.255.250 Change To Exclude Mode
Record Type: Change To Exclude Mode (4)
Aux Data Len: 0
Num Src: 0
Multicast Address: 239.255.255.250 (239.255.255.250)
No. Time Source Destination Protocol Info
****希望能帮到你
