ping to/from remote host - 2 packets ping echo request ping echo reply topology: laptop/lucent 80211 card ... wireless link AP ... ethernet ... linux/router (nat/dhcp) .. Inet .. remote host unicast ping/to from remote host ------------------------------------------------------------ metastructure 802.11 header: 24 bytes control flags: data packet TO DS (to AP/inside ...) 3 mac addresses bss id (also agere card) src (agere card) dst (on other side of AP, linux router) llc: 8 bytes snap sap aa aa 03 00 00 00 08 00 ip header type indicated (0x800) ip hdr: 20 bytes, unicast icmp hdr: ping echo frame 1 details: Frame 102 (116 on wire, 116 captured) Arrival Time: Mar 9, 2002 08:48:25.536445000 Time delta from previous packet: 0.004372000 seconds Time relative to first packet: 5.037050000 seconds Frame Number: 102 Packet Length: 116 bytes Capture Length: 116 bytes IEEE 802.11 Type/Subtype: Data (32) Frame Control: 0x0108 Version: 0 Type: Data frame (2) Subtype: 0 Flags: 0x1 DS status: Frame is entering DS (To DS: 1 From DS: 0) (0x01) .... .0.. = Fragments: No fragments .... 0... = Retry: Frame is not being retransmitted ...0 .... = PWR MGT: STA will stay up ..0. .... = More Data: No data buffered .0.. .... = WEP flag: WEP is disabled 0... .... = Order flag: Not strictly ordered Duration: 258 BSS Id: 00:02:2d:2a:1f:d1 (Agere_2a:1f:d1) Source address: 00:02:2d:0d:06:c2 (Agere_0d:06:c2) Destination address: 00:03:47:72:1d:42 (Intel_72:1d:42) Fragment number: 0 Sequence number: 183 Logical-Link Control DSAP: SNAP (0xaa) IG Bit: Individual SSAP: SNAP (0xaa) CR Bit: Command Control field: U, func = UI (0x03) 000. 00.. = Unnumbered Information .... ..11 = Unnumbered frame Organization Code: Encapsulated Ethernet (0x000000) Type: IP (0x0800) Internet Protocol, Src Addr: 192.168.30.146 (192.168.30.146), Dst Addr: 131.252.120.50 (131.252.120.50) Version: 4 Header length: 20 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: 84 Identification: 0x0029 Flags: 0x00 .0.. = Don't fragment: Not set ..0. = More fragments: Not set Fragment offset: 0 Time to live: 64 Protocol: ICMP (0x01) Header checksum: 0x9f17 (correct) Source: 192.168.30.146 (192.168.30.146) Destination: 131.252.120.50 (131.252.120.50) Internet Control Message Protocol Type: 8 (Echo (ping) request) Code: 0 Checksum: 0xea23 (correct) Identifier: 0xe700 Sequence number: 00:00 Data (56 bytes) 0000 08 01 02 01 00 02 2d 2a 1f d1 00 02 2d 0d 06 c2 ......-*....-... 0010 00 03 47 72 1d 42 70 0b aa aa 03 00 00 00 08 00 ..Gr.Bp......... 0020 45 00 00 54 00 29 00 00 40 01 9f 17 c0 a8 1e 92 E..T.)..@....... 0030 83 fc 78 32 08 00 ea 23 e7 00 00 00 6e 3f 8a 3c ..x2...#....n?.< 0040 37 5c 0c 00 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 7\.............. 0050 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 ............ !"# 0060 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30 31 32 33 $%&'()*+,-./0123 0070 34 35 36 37 4567 -------------------------------------------------------------------------- frame 2 overview: 802.11 header, 24 bytes control flags: frame is EXITING DS 3 mac addresses dst: laptop (agere) bss id: agere AP source: intel/linux router note: retransmit flag set llc: 8 bytes, as previous frame ip icmp echo reply frame 2 details: Frame 103 (116 on wire, 116 captured) Arrival Time: Mar 9, 2002 08:48:25.566564000 Time delta from previous packet: 0.030119000 seconds Time relative to first packet: 5.067169000 seconds Frame Number: 103 Packet Length: 116 bytes Capture Length: 116 bytes IEEE 802.11 Type/Subtype: Data (32) Frame Control: 0x0A08 Version: 0 Type: Data frame (2) Subtype: 0 Flags: 0xA DS status: Frame is exiting DS (To DS: 0 From DS: 1) (0x02) .... .0.. = Fragments: No fragments .... 1... = Retry: Frame is being retransmitted ...0 .... = PWR MGT: STA will stay up ..0. .... = More Data: No data buffered .0.. .... = WEP flag: WEP is disabled 0... .... = Order flag: Not strictly ordered Duration: 258 Destination address: 00:02:2d:0d:06:c2 (Agere_0d:06:c2) BSS Id: 00:02:2d:2a:1f:d1 (Agere_2a:1f:d1) Source address: 00:03:47:72:1d:42 (Intel_72:1d:42) Fragment number: 0 Sequence number: 2149 Logical-Link Control DSAP: SNAP (0xaa) IG Bit: Individual SSAP: SNAP (0xaa) CR Bit: Command Control field: U, func = UI (0x03) 000. 00.. = Unnumbered Information .... ..11 = Unnumbered frame Organization Code: Encapsulated Ethernet (0x000000) Type: IP (0x0800) Internet Protocol, Src Addr: 131.252.120.50 (131.252.120.50), Dst Addr: 192.168.30.146 (192.168.30.146) Version: 4 Header length: 20 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: 84 Identification: 0x4582 Flags: 0x04 .1.. = Don't fragment: Set ..0. = More fragments: Not set Fragment offset: 0 Time to live: 238 Protocol: ICMP (0x01) Header checksum: 0x6bbd (correct) Source: 131.252.120.50 (131.252.120.50) Destination: 192.168.30.146 (192.168.30.146) Internet Control Message Protocol Type: 0 (Echo (ping) reply) Code: 0 Checksum: 0xf223 (correct) Identifier: 0xe700 Sequence number: 00:00 Data (56 bytes) 0000 08 0a 02 01 00 02 2d 0d 06 c2 00 02 2d 2a 1f d1 ......-.....-*.. 0010 00 03 47 72 1d 42 50 86 aa aa 03 00 00 00 08 00 ..Gr.BP......... 0020 45 00 00 54 45 82 40 00 ee 01 6b bd 83 fc 78 32 E..TE.@...k...x2 0030 c0 a8 1e 92 00 00 f2 23 e7 00 00 00 6e 3f 8a 3c .......#....n?.< 0040 37 5c 0c 00 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 7\.............. 0050 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 ............ !"# 0060 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30 31 32 33 $%&'()*+,-./0123 0070 34 35 36 37 4567