Use display ipv6 tcp verbose to display detailed information about IPv6 TCP connections.
Syntax
display ipv6 tcp verbose [ slot slot-number [ pcb pcb-index ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
pcb pcb-index: Specifies a PCB by its index in the range of 1 to 16.
slot slot-number: Specifies an IRF member device by its member ID.
Usage guidelines
Detailed information about an IPv6 TCP connection includes socket's creator, state, option, type, protocol number, source IPv6 address and port number, destination IPv6 address and port number, and the connection state.
Examples
# Display detailed information about an IPv6 TCP connection.
<Sysname> display ipv6 tcp verbose
TCP inpcb number: 1(tcpcb number: 1)
Slot: 6
Creator: telnetd_mips[199]
State: ISCONNECTED
Options: N/A
Error: 0
Receiving buffer(cc/hiwat/lowat/state): 0 / 65536 / 1 / N/A
Sending buffer(cc/hiwat/lowat/state): 0 / 65536 / 512 / N/A
Type: 1
Protocol: 6
Connection info: src = 2001::1->23 , dst = 2001::2->4181
Inpcb flags: N/A
Inpcb vflag: INP_IPV6
Hop limit: 255 (minimum hop limit: 0)
Connection state: ESTABLISHED
Send VRF: 0x0
Receive VRF: 0x0
Field | Description |
|---|
TCP inpcb number | Number of IPv6 TCP Internet PCBs. |
tcpcb number | Number of IPv6 TCP PCBs (excluding PCBs of TCP in TIME_WAIT state). |
Slot | ID of the IRF member device. |
Creator | Task name of the socket. The process number is in the square brackets. |
State | Socket state. |
Options | Socket options. |
Error | Error code. |
Receiving buffer(cc/hiwat/lowat/state) | Displays receive buffer information in the following order: cc—Used space. hiwat—Maximum space. lowat—Minimum space. state—Buffer state: CANTSENDMORE—Unable to send data to the peer. CANTRCVMORE—Unable to receive data from the peer. RCVATMARK—Receiving tag. N/A—None of the above states.
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Sending buffer(cc/hiwat/lowat/state) | Displays send buffer information in the following order: cc—Used space. hiwat—Maximum space. lowat—Minimum space. state—Buffer state: CANTSENDMORE—Unable to send data to the peer. CANTRCVMORE—Unable to receive data from the peer. RCVATMARK—Receiving tag. N/A—None of the above states.
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Type | Socket type: 1—SOCK_STREAM. This socket uses TCP to provide reliable transmission of byte streams. 2—SOCK_DGRAM. This socket uses UDP to provide datagram transmission. 3—SOCK_RAW. This socket allows an application to change the next upper-layer protocol header. N/A—None of the above types.
|
Protocol | Number of the protocol using the socket. 6 represents TCP. |
Connection info | Connection information, including source IPv6 address and port number, and destination IPv6 address and port number. |
Inpcb flags | Flags in the Internet PCB: INP_RECVOPTS—Receives IPv6 options. INP_RECVRETOPTS—Receives replied IPv6 options. INP_RECVDSTADDR—Receives destination IPv6 address. INP_HDRINCL—Provides the entire IPv6 header. INP_REUSEADDR—Reuses the IPv6 address. INP_REUSEPORT—Reuses the port number. INP_ANONPORT—Port number not specified. INP_PROTOCOL_PACKET—Identifies a protocol packet. INP_RCVVLANID—Receives the VLAN ID of the packet. Only UDP and RawIP support this flag. IN6P_IPV6_V6ONLY—Only supports IPv6 protocol stack. IN6P_PKTINFO—Receives the source IPv6 address and input interface of the packet. IN6P_HOPLIMIT—Receives the hop limit. IN6P_HOPOPTS—Receives the hop-by-hop options extension header. IN6P_DSTOPTS—Receives the destination options extension header. IN6P_RTHDR—Receives the routing extension header. IN6P_RTHDRDSTOPTS—Receives the destination options extension header preceding the routing extension header. IN6P_TCLASS—Receives the traffic class of the packet. IN6P_AUTOFLOWLABEL—Attaches a flow label automatically. IN6P_RFC2292—Uses the API specified in RFC 2292. IN6P_MTU—Discovers differences in the MTU size of every link along a given data path. TCP does not support this flag. INP_RCVMACADDR—Receives the MAC address of the frame. INP_SYNCPCB—Waits until Internet PCB is synchronized. N/A—None of the above flags.
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Inpcb vflag | IP version flags in the Internet PCB: INP_IPV4—IPv4 protocol. INP_IPV6—IPv6 protocol. INP_IPV6PROTO—Creates an Internet PCB based on IPv6 protocol. INP_TIMEWAIT—In TIMEWAIT state. INP_ONESBCAST—Sends broadcast packets. INP_DROPPED—Protocol dropped flag. INP_SOCKREF—Strong socket reference. INP_DONTBLOCK—Do not block synchronization of the Internet PCB. N/A—None of the above flags.
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Hop limit(minimum hop limit) | Hop limit in the Internet PCB. The minimum number of hops is in the parentheses. |
Connection state | TCP connection state: CLOSED—The server receives a disconnection request's reply from the client. LISTEN—The server is waiting for connection requests. SYN_SENT—The client is waiting for the server to reply to the connection request. SYN_RCVD—The server receives a connection request. ESTABLISHED—The server and client have established connections and can transmit data bidirectionally. CLOSE_WAIT—The server receives a disconnection request from the client. FIN_WAIT_1—The client is waiting for the server to reply to a disconnection request. CLOSING—The server and client are waiting for peer's disconnection reply when receiving disconnection requests from each other. LAST_ACK—The server is waiting for the client to reply to a disconnection request. FIN_WAIT_2—The client receives a disconnection reply from the server. TIME_WAIT—The client receives a disconnection request from the server.
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Send VRF | Sent instances. |
Receive VRF | Received instances. |