TCP/IP: Difference between revisions

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Revision as of 11:57, 2 December 2019 view source Amanjosan2008 (talk \| contribs) Bureaucrats, Administrators 4,410 edits →‎Options ← Older edit		Latest revision as of 23:20, 15 December 2021 view source Amanjosan2008 (talk \| contribs) Bureaucrats, Administrators 4,410 edits →‎IP Packet
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Line 13: * Total length field = 16 bytes * Therefore Max Packet length = 2<sup>16</sup>-1= 65535 * Fragment offset is required to use 13 bits, it takes away 3 bits, so it can only index every 8th (2^3) byte, so the indices were for 8-byte chunks. THUS the 8 * Fragment Offset to calculate the actual byte-offset of each fragment. <br /> Line 109: * Only Data in a datagram is fragmented. Header is never fragmented. * Options are in a TLV format which can be max 40 Bytes in length. [Type][Length][Value] * Type field is 1 Byte & Length field is also 1 byte in length. * Options field may or may not be copied into each fragment. * Copy Options filed into a Fragment is based on the first bit of Type ~~filed~~field. 1st bit = 0 ==> Copy options in 1st fragment only 1st bit = 1 ==> Copy options in all fragments * Fragmented Packet Analysis: Line 348 ⟶ 349: - Data is delivered to the process in order * Lost Segment - ~~Receiver~~Receive data in other ~~segment~~segments in its buffer but leaves a gap to indicate non continuity in the data - Receiver immediately sends an acknowledgment displaying the next byte it expects - Segment retransmitted after RTO or after 3 duplicate Acks. Line 703 ⟶ 704: \|HTTP \|TCP \|- \|88 \|Kerberos \|TCP,UDP \|- \|110 Line 721 ⟶ 726: \|- \|161 \|SNMP (Poll) \|UDP \|- Line 738 ⟶ 743: \|443 \|HTTP over SSL \| \|- \|445 \|SMB \| \|-