TCP segment of a reassembled PDU 49489 http ACK Seq622 Ack1408151 Win261340 from CS 541 at SUNY Buffalo State College
TCP Reassembly Wireshark supports reassembly of PDU s spanning multiple TCP segments for a large number of protocols implemented on top of TCP. These protocols include, but are not limited to, iSCSI , HTTP , DNS , Kerberos , CIFS , ONC-RPC etc. The link layer PDU is the frame. On TCP/IP over Ethernet, the data on the physical layer is carried in Ethernet frames. ATM. The data link layer PDU in Asynchronous transfer mode (ATM) networks is called a cell. Media access control protocol data unit TCP segment of a reassembled PDU length too small. TCP reassembly and misordered frames. Query on tcp segment of a reassembled pdu option. Displaying all TCP connections with SYN packets "TCP out of order " what does it means ?!!! Adding custom TCP options. Not honoring own MSS? Is there any way to find the tcp stream number based on packet number? All but the final segment will be marked with “[TCP segment of a reassembled PDU]” in the packet list. Disable this preference to reduce memory and processing overhead if you are only interested in TCP sequence number analysis (Section 7.5, “TCP Analysis”). Keep in mind, though, that higher level protocols might be wrongly dissected. [TCP segment of a reassembled PDU] しらべたことは覚えているのに肝心な内容を覚えていない・・・残念。ということで書いておけば参照できるからいいですね。 これはTCPレベルでパケットを分割しましたよ・・・という意味です。多分。 Having the hosts numbered .76 and .67 is a little bit mind-numbing. Wireshark is calling frame 6 a "TCP segment of a reassembled PDU" because your TCP implementation on 10.10.10.67 is opting to send an ACK w/o payload (a "naked" ACK) rather than including the payload that gets sent in frame 6 w/ the ACK in frame 5. [TCP segment of a Reassembled PDU] 表記のパケットについて、中央ペインで展開して中身を見ると、TCP レイヤーの情報はありますが、その上位層の http レイヤーの結果は表示されません。ですが、最後のパケット (No.1000) にまとめて表示してくれます。
No. Time Source Destination Protocol Length Info 7303 5.841186000 10.a.bbb.ccc 10.xxx.yy.zzz TCP 60 [TCP ZeroWindow] microsoft-ds > 57918 [ACK] Seq=10864 Ack=6973070 Win=0 Len=0 7304 6.149715000 10.xxx.yy.zzz 10.a.bbb.ccc TCP 55 [TCP ZeroWindowProbe] [TCP segment of a reassembled PDU] 7305 6.150137000 10.a.bbb.ccc 10.xxx.yy.zzz TCP 60 [TCP
2050 86.673954000 192.168.1.103 192.168.1.100 TCP 1154 [TCP segment o f a reassembled PDU] Frame 2050: 1154 bytes on wire (9232 bits), 1154 bytes captured (9232 bits) on interface 0 Interface id: 0 Encapsulation type: Ethernet (1) Arrival Time: Nov 5, 2013 15:03:46.089052000 Central Standard Time The Ethernet software inspects the layer 2 PDU (Ethernet frame) and removes from it the layer 2 SDU (IP datagram) which it passes up to IP as a layer 3 PDU. The IP layer removes the layer 3 SDU (TCP segment) and passes it to TCP as a layer 4 PDU. TCP in turn continues the process, going back up the protocol layer stack.
[TCP segment of a Reassembled PDU] 表記のパケットについて、中央ペインで展開して中身を見ると、TCP レイヤーの情報はありますが、その上位層の http レイヤーの結果は表示されません。ですが、最後のパケット (No.1000) にまとめて表示してくれます。
Len 1460 TOP Segent of a reassembled PDU) 1514 443 + 54868 [ACK) Seg 11703 Ack 234 Win 1578 Lens 1460 (TCP segment of a reassembled PDU] SO 54848 443 [ACK) Seg-234 Ack-13163 win-65536 Lene 1514 441.54848 ACK) SP-13163 Ack-24 Win 15744 Len1460 TCP segment of a reassembled POU) 1514 443 +54848 (MCK) Seq-14623 Ack-234 Win 15744 Len-1460 TCP