Netzwerkmanagement / Netzdiagnose
TCP/IP-Diagnose

Tools zur Diagnose von TCP/IP-Verbindungen sind in jedem Linux-System vorhanden.

Ip:
   72175693 total packets received
   0 forwarded
   0 incoming packets discarded
   72162338 incoming packets delivered
   89727857 requests sent out

Icmp:
   153 ICMP messages received
   0 input ICMP message failed.
   ICMP input histogram:
       destination unreachable: 31
       source quenches: 102
       echo requests: 1
       echo replies: 19
   107 ICMP messages sent
   0 ICMP messages failed
   ICMP output histogram:
       destination unreachable: 106
       echo replies: 1

Tcp:
   84679 active connections openings
   4216 passive connection openings
   9 failed connection attempts
   0 connection resets received
   94 connections established
   71744460 segments received
   89303499 segments send out
   19747 segments retransmited
   75 bad segments received.
   5983 resets sent

Udp:
   423624 packets received
   91 packets to unknown port received.
   0 packet receive errors
   424422 packets sent

TcpExt:
   72 invalid SYN cookies received
   22 packets pruned from receive queue because of socket buffer overrun
   24710 TCP sockets finished time wait in fast timer
   5 packets rejects in established connections because of timestamp
   4285306 delayed acks sent
   546 delayed acks further delayed because of locked socket
   Quick ack mode was activated 7475 times
   94582 packets directly queued to recvmsg prequeue.
   58043 packets directly received from backlog
   89129790 packets directly received from prequeue
   49763220 packets header predicted

Die obige Liste haben wir gekürzt, um etwas Platz zu sparen.