Differrence between MTU & MSS, IP Fragmentation & TCP
TCP segment of a reassembled PDU. 上周在公司里遇到一个问题，用wireshark抓系统给网管上报的数据发现里面有好多报文被标识为“TCP segment of a reassembled PDU”，并且每一段报文都是180Byte，当时看到这样的标识，觉得是IP报文分片，以为系统的接口MTU值为设置小了，通过命令查询发现是 1500，没有被重设过，当时有点想不通。. 回来查了一下，发现自己的理解是错的，“TCP segment of a [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。 "TCP segment of a reassembled PDU" means that the TCP segment in the frame in question contains part of a higher-level packet, but doesn't contain the last segment of a higher-level packet. Resolution:- After recording the tcpdump and capturing the packets using the pcap file generated and analyzed via the wireshark we noticed the packed 106 was a [TCP segment of a reassembled PDU]. Actually the HTTP Packet is not complete, so the Wireshark is also unable to see the packet as an HTTP valid one, this is the same behavior as the ELB have.
Sep 27, 2016
TCP Reassembly. Wireshark supports reassembly of PDUs 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. All in all probably something like 20 different protocols. The support to do this is very easy to add to Mailing List Archive: "TCP Segment of a reassembled PDU
Jul 06, 2006 · of "TCP segment of a reassembled PDU" messages. Some of these packets are, however, only 22 bytes. For instance, frame 3 is 54 bytes and frame 4 - the first listed as a reassembled PDU - is 76 bytes. The actual dialog occuring is a simple client connecting to a server, handshaking, and then requesting packets of increasing sizes, and the
Protocol data unit - Wikipedia The transport layer PDU is the TCP segment for TCP, and the datagram for UDP. The Internet layer PDU is the packet. 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 … TCP_Reassembly - The Wireshark Wiki TCP Reassembly. Wireshark supports reassembly of PDUs 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. All in all probably something like 20 different protocols. The support to do this is very easy to add to Mailing List Archive: "TCP Segment of a reassembled PDU Jul 06, 2006 f a reassembled PDU]