196.6.2.2 Tracepunkt TCP

196.6.2.2 Tracepunkt TCP

Tabelle 50

Struktur der Aufzeichnung am Tracepunkt TCP

IP address of remote host

vgl. Bild auf Seite 2530

vgl. Tabelle 51 auf Seite 2536

socket state after

socket state after event processing

vgl. Tabelle 53 auf Seite 2537

connection state before

connection state before processing the event; vgl. Tabelle 54 auf Seite 2537

actual chars in buffer

if the location is TA_INPUT or TA_DROP, this items refers to the receive buffer, otherwise to the send buffer

allocated memory

total memory allocated by mbufs and clusters
(1 mbuf=256 byte, 1 clusters=1518 byte)

connection state after

connection state after event processing

vgl. Tabelle 54 auf Seite 2537

retransmit timer

Ticks to retransmit the data starting at

"Seq-Nr: send unacknowledged"

Note: 1 Tick = 0,5 sec.

Ticks to send next data probe

keepalive timer

Ticks to send next keep-alive packet

number retransmissions

rexmit backoff idx

current rexmit interval

current retransmission interval

Seq-Nr: send unackn.

Sequence number send unacknowledged

Seq-Nr: send next

Sequence number send next

max. number of unacknowledged bytes

Seq-Nr: receive next

Sequence number receive next

amount of receive capacity (actually)

advertised rcv window

advertised receive window

Tabelle 51

Tracepunkte und ihre möglichen TCP Ereignisse

attach protocol to socket

detach protocol from socket

bind socket to address

listen for connection

establish connection to peer

accept connection from peer

disconnect from peer

abort (fast DISCONNECT, DETATCH)

TCP-Flags + length of user data in WORDS

TCP-Flags + length of user data in WORDS

the TCP-Flags (see Tabelle 55 auf Seite 2538) of received TCP packet will be saved into the Intel bits 0 - 5 of byte 0 in TCP event,

the length of user data -counted in words- will be saved into the bits 6,7 of byte 0 and bits 0 - 7 of byte 1 (most significant byte)

TCP-Flags + cause for dropping

analogous to TA_INPUT;
the possible values of cause for dropping are listed in Tabelle 52 auf Seite 2537

TA_DROPAFTERACK

TCP-Flags + cause for dropping

analogous to TA_INPUT;
the possible values of cause for dropping are listed in Tabelle 52 auf Seite 2537

TCP-Flags + cause for dropping

analogous to TA_INPUT;
the possible values of cause for dropping are listed in Tabelle 52 auf Seite 2537

Tabelle 52

Gründe für den Ausfall eines TCP Paketes und / oder einer Verbindung

required memory resources not available

creation of new socket failed due to no socket space

unexpected flag received

call of in_pcbconnect failed

unexpected sequence number received

connection already closed

TCP waits for the FIN of communication partner

Tabelle 53

Bits der Socket-Zustände

no file table ref any more

socket connected to a peer

SS_ISCONNECTING

in process of connecting to peer

SS_ISDISCONNECTING

in process of disconnecting

SS_CANTSENDMORE

can’t send more data to peer

can’t receive more data from peer

at mark on input

privileged for broadcast

non-blocking ops

async i/o notify

SS_ISCONFIRMING

deciding to accept connection req

Tabelle 54

Definitionen der Zustände des TCP FMS. Per RFC793, September, 1981.

connection closed

listening for connection

active - have sent SYN

TCPS_SYN_RECEIVED

has send and received SYN

TCPS_ESTABLISHED

connection established

TCPS_CLOSE_WAIT

received FIN - waiting for close

TCPS_FIN_WAIT_1

has closed - sent FIN

closed an FIN exchanged - await FIN ACK

had FIN and close - await FIN ACK

TCPS_FIN_WAIT_2

has closed - FIN is acked

quiet wait after close

Tabelle 55

TCP Flags und ihre Bedeutung

Bit nr:¹

Urgent Pointer field is
significant

Acknowledgment field is significant

Reset (Close) the connection

Synchr. sequence numbers; start connection

No more data from sender; connection close

1

numbering in Intel-format (numbers in brackets correspond to network-numbering)

Bild 71

Trace Beispiele für Tracepunkt TCP

OpenScape 4000 V11, Band 1: AMO Beschreibungen, Servicedokumentation, Ausgabe 2, ID: P31003H31B0S107027620

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