ethernet ip tcp header size @ flytw1 ccie - 隨意窩

201604131458ethernet ip tcp header size ?network. ethernet 14byte, ip 20bytes, tcp 20bytes. normal tcp header 20bytes + 20 bytes option(maximum) flytw1ccieaplacetonotedowneverythingI'velearned~記錄學習筆記日誌相簿影音好友名片 201604131458ethernetiptcpheadersize?networkethernet14byte, ip20bytes, tcp20bytes normaltcpheader20bytes+20bytesoption(maximum)syn,ackwillincludeoption:contentmssvaluee.g.mssvalue:1460bytes Options與Padding：Options欄位長度不定，可用來擴充TCP的功能。

Padding欄位是為了讓TCP表頭（包含Options欄位）剛好是4Bytes的倍數。

icmpheader=8bytes,1500-(14+20+8)=1458 ##tofindmaximumpayloadsize.trytosendapayloadwithforcenodefragement.  ping-l1480-f10.4.1.1   No.ofbytes Fieldtype Description Headertype 1-6 DA Destinationaddress EthernetHeader 7-12 SA SourceAddress EthernetHeader 13-14 Type TypeField0x800-IP0x806ARP EthernetHeader 15 Ver Ver=4,No.of4bytewordsintheheader IPheader 16 Type TypeofService(typically0) IPheader 17-18 T-len TotallengthofpacketinbytesincludingIPheader IPheader 19-20 ID UniqueIdentificationofpacket IPheader 21 Flags 3bits(0-DF-MF)DF=0Mayfragment,MF=0lastfragment IPheader 21-22 Offset Fragmentoffsetin64bitblocks IPheader 23 TTL Timetolive IPheader 24 Protocol Upperlevelprotocolcarriedindata(TCP/UDP) IPheader 25-26 Checksum Checksumoftheheader IPheader 27-30 IPSA IPsourceaddress IPheader 31-34 IPDA IPdestinationaddress IPheader 35-36 S-port Sourceport TCPheader 37-38 D-port destinationport TCPheader 39-42 Seq.Num. SequenceNumber TCPheader 43-46 ACK Acknowledgementnumber TCPheader 47 Len 4bitsizeofTCPheaderin4bytewords TCPheader 47-48 Reserved 6bitsnotused TCPheader 48 Flags UAPRSF(U=Urgent,A=Ack,P=Push,R=Reset,S=Sync,F=Fin) TCPheader 49-50 Window TCPWindow(forflowcontrol) TCPheader 51-52 Checksum Checksumforheaderanddata TCPheader 53-54 Urgent Urgentpointer TCPheader 55toN DATA TCPData DataPayloadpart N+1 FCS CRC(4byte) EthernetHeader  Johnny/Xuite日誌/回應(0)/引用(0)沒有上一則|日誌首頁|沒有下一則回應 關鍵字 全部展開|全部收合 flytw1's新文章搬站通知ubuntu20.04NICchangebacktoeth0TightVNCVNCserverinstallationftpservervsftpcodingstyleK&Rlinux黑洞>/dev/null2>&1VPLSAToMcontrolplanedataplanemanagementplanemakewin10morelikelywin7IP67IP68防塵及防水等級 加我為好友JohnnyChuang(CCIE#43056))日誌相簿影音MyCertification 全部展開|全部收合