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Untuk melihat kejadian ini, maka Anda dapat menggunakan aplikasi NETSTAT pada Windows
untuk mengecek data statistik jaringan dengan perintah sebagai berikut:
● mengecek 'kesehatan' jaringan dengan menganalisa statistik jaringan.
● menampilkan koneksi TCP aktif, port-port mana saja yang digunakan, statistik
ethernet, tabel rute IP, statistik IPv4 (untuk protokol IP, ICMP, TCP, dan UDP), dan
IPv6 (untuk protokol IPv6, ICMPv6, TCP over IPv6, dan UDP over IPv6).
Penggunaan tanpa parameter hanya akan menampilkan koneksi TCP yang aktif.
Paket Ethernet (“Amplop”) dapat rusak biasanya disebabkan karena perangkat keras
(hardware) yang jelek seperti:
1. NIC (Network Interface card) yang jelek/rusak
2. rusaknya terminator atau port hub
3. kabel terlalu panjang melebihi kemampuan spesifikasi teknis kabel
4. konektor T yang jelek/rusak
Contoh: netstat -se
Hasil: WINDOWS
Interface Statistics
Received Sent
Non-unicast packets 100 115
Discards 0 0
Errors 0 0
Unknown protocols 0
IPv4 Statistics
Packets Received = 54982
Received Header Errors = 0
Received Address Errors = 15
Datagrams Forwarded = 0
Unknown Protocols Received = 0
Received Packets Discarded = 12
Received Packets Delivered = 54970
Output Requests = 45566
Routing Discards = 0
Discarded Output Packets = 2
Output Packet No Route = 0
Reassembly Required = 0
Reassembly Successful = 0
Reassembly Failures = 0
Datagrams Successfully Fragmented = 0
Datagrams Failing Fragmentation = 0
Fragments Created = 0
IPv6 Statistics
Packets Received = 2
Received Header Errors = 0
Received Address Errors = 0
Datagrams Forwarded = 0
Unknown Protocols Received = 0
Received Packets Discarded = 0
Received Packets Delivered = 0
Output Requests = 0
Routing Discards = 0
Discarded Output Packets = 0
Output Packet No Route = 0
Reassembly Required = 0
Reassembly Successful = 0
Reassembly Failures = 0
Datagrams Successfully Fragmented = 0
Datagrams Failing Fragmentation = 0
Fragments Created = 0
ICMPv4 Statistics
Received Sent
Messages 66 7
Errors 0 0
Destination Unreachable 2 3
Time Exceeded 64 0
Parameter Problems 0 0
Source Quenches 0 0
Redirects 0 0
Echos 0 4
Echo Replies 0 0
Timestamps 0 0
Timestamp Replies 0 0
Address Masks 0 0
Address Mask Replies 0 0
ICMPv6 Statistics
Received Sent
Messages 2 30
Errors 0 0
MLD Reports 0 2
Router Solicitations 0 27
Router Advertisements 2 0
Neighbor Solicitations 0 1
TCP Statistics for IPv4
Active Opens = 19
Passive Opens = 0
Failed Connection Attempts = 0
Reset Connections = 18
Current Connections = 1
Segments Received = 19571
Segments Sent = 10089
Segments Retransmitted = 0
TCP Statistics for IPv6
Active Opens = 0
Passive Opens = 0
Failed Connection Attempts = 0
Reset Connections = 0
Current Connections = 0
Segments Received = 0
Segments Sent = 0
Segments Retransmitted = 0
UDP Statistics for IPv4
Datagrams Received = 35393
No Ports = 9
Receive Errors = 0
Datagrams Sent = 35455
UDP Statistics for IPv6
Datagrams Received = 0
No Ports = 0
Receive Errors = 0
Datagrams Sent = 0
Hasil: LINUX
Ip:
166843 total packets received
4 with invalid addresses
0 forwarded
0 incoming packets discarded
166839 incoming packets delivered
143956 requests sent out
202 dropped because of missing route
Icmp:
65 ICMP messages received
0 input ICMP message failed.
ICMP input histogram:
destination unreachable: 60
echo requests: 2
echo replies: 3
86 ICMP messages sent
0 ICMP messages failed
ICMP output histogram:
destination unreachable: 84
echo replies: 2
Tcp:
1692 active connections openings
22 passive connection openings
8 failed connection attempts
119 connection resets received
1 connections established
155576 segments received
132694 segments send out
200 segments retransmited
0 bad segments received.
598 resets sent
Udp:
11153 packets received
41 packets to unknown port received.
0 packet receive errors
11016 packets sent
UdpLite:
TcpExt:
7 packets pruned from receive queue because of socket buffer overrun
377 TCP sockets finished time wait in fast timer
1 time wait sockets recycled by time stamp
2626 delayed acks sent
3 delayed acks further delayed because of locked socket
Quick ack mode was activated 209 times
70 packets directly queued to recvmsg prequeue.
70572 of bytes directly received from prequeue
83536 packet headers predicted
57 packets header predicted and directly queued to user
5168 acknowledgments not containing data received
7914 predicted acknowledgments
53 congestion windows recovered after partial ack
0 TCP data loss events
1 timeouts in loss state
31 retransmits in slow start
83 other TCP timeouts
206 packets collapsed in receive queue due to low socket buffer
205 DSACKs sent for old packets
24 DSACKs received
117 connections reset due to unexpected data
32 connections reset due to early user close
12 connections aborted due to timeout
IpExt:
InMcastPkts: 92
OutMcastPkts: 109
InBcastPkts: 1272
OutBcastPkts: 537
sumber : blogcatalog.com
untuk mengecek data statistik jaringan dengan perintah sebagai berikut:
NETSTAT
Fungsi:● mengecek 'kesehatan' jaringan dengan menganalisa statistik jaringan.
● menampilkan koneksi TCP aktif, port-port mana saja yang digunakan, statistik
ethernet, tabel rute IP, statistik IPv4 (untuk protokol IP, ICMP, TCP, dan UDP), dan
IPv6 (untuk protokol IPv6, ICMPv6, TCP over IPv6, dan UDP over IPv6).
Penggunaan tanpa parameter hanya akan menampilkan koneksi TCP yang aktif.
Paket Ethernet (“Amplop”) dapat rusak biasanya disebabkan karena perangkat keras
(hardware) yang jelek seperti:
1. NIC (Network Interface card) yang jelek/rusak
2. rusaknya terminator atau port hub
3. kabel terlalu panjang melebihi kemampuan spesifikasi teknis kabel
4. konektor T yang jelek/rusak
Contoh: netstat -se
Hasil: WINDOWS
Interface Statistics
Received Sent
Bytes 27824843 1868952
Unicast packets 54898 45459Non-unicast packets 100 115
Discards 0 0
Errors 0 0
Unknown protocols 0
IPv4 Statistics
Packets Received = 54982
Received Header Errors = 0
Received Address Errors = 15
Datagrams Forwarded = 0
Unknown Protocols Received = 0
Received Packets Discarded = 12
Received Packets Delivered = 54970
Output Requests = 45566
Routing Discards = 0
Discarded Output Packets = 2
Output Packet No Route = 0
Reassembly Required = 0
Reassembly Successful = 0
Reassembly Failures = 0
Datagrams Successfully Fragmented = 0
Datagrams Failing Fragmentation = 0
Fragments Created = 0
IPv6 Statistics
Packets Received = 2
Received Header Errors = 0
Received Address Errors = 0
Datagrams Forwarded = 0
Unknown Protocols Received = 0
Received Packets Discarded = 0
Received Packets Delivered = 0
Output Requests = 0
Routing Discards = 0
Discarded Output Packets = 0
Output Packet No Route = 0
Reassembly Required = 0
Reassembly Successful = 0
Reassembly Failures = 0
Datagrams Successfully Fragmented = 0
Datagrams Failing Fragmentation = 0
Fragments Created = 0
ICMPv4 Statistics
Received Sent
Messages 66 7
Errors 0 0
Destination Unreachable 2 3
Time Exceeded 64 0
Parameter Problems 0 0
Source Quenches 0 0
Redirects 0 0
Echos 0 4
Echo Replies 0 0
Timestamps 0 0
Timestamp Replies 0 0
Address Masks 0 0
Address Mask Replies 0 0
ICMPv6 Statistics
Received Sent
Messages 2 30
Errors 0 0
MLD Reports 0 2
Router Solicitations 0 27
Router Advertisements 2 0
Neighbor Solicitations 0 1
TCP Statistics for IPv4
Active Opens = 19
Passive Opens = 0
Failed Connection Attempts = 0
Reset Connections = 18
Current Connections = 1
Segments Received = 19571
Segments Sent = 10089
Segments Retransmitted = 0
TCP Statistics for IPv6
Active Opens = 0
Passive Opens = 0
Failed Connection Attempts = 0
Reset Connections = 0
Current Connections = 0
Segments Received = 0
Segments Sent = 0
Segments Retransmitted = 0
UDP Statistics for IPv4
Datagrams Received = 35393
No Ports = 9
Receive Errors = 0
Datagrams Sent = 35455
UDP Statistics for IPv6
Datagrams Received = 0
No Ports = 0
Receive Errors = 0
Datagrams Sent = 0
Hasil: LINUX
Ip:
166843 total packets received
4 with invalid addresses
0 forwarded
0 incoming packets discarded
166839 incoming packets delivered
143956 requests sent out
202 dropped because of missing route
Icmp:
65 ICMP messages received
0 input ICMP message failed.
ICMP input histogram:
destination unreachable: 60
echo requests: 2
echo replies: 3
86 ICMP messages sent
0 ICMP messages failed
ICMP output histogram:
destination unreachable: 84
echo replies: 2
Tcp:
1692 active connections openings
22 passive connection openings
8 failed connection attempts
119 connection resets received
1 connections established
155576 segments received
132694 segments send out
200 segments retransmited
0 bad segments received.
598 resets sent
Udp:
11153 packets received
41 packets to unknown port received.
0 packet receive errors
11016 packets sent
UdpLite:
TcpExt:
7 packets pruned from receive queue because of socket buffer overrun
377 TCP sockets finished time wait in fast timer
1 time wait sockets recycled by time stamp
2626 delayed acks sent
3 delayed acks further delayed because of locked socket
Quick ack mode was activated 209 times
70 packets directly queued to recvmsg prequeue.
70572 of bytes directly received from prequeue
83536 packet headers predicted
57 packets header predicted and directly queued to user
5168 acknowledgments not containing data received
7914 predicted acknowledgments
53 congestion windows recovered after partial ack
0 TCP data loss events
1 timeouts in loss state
31 retransmits in slow start
83 other TCP timeouts
206 packets collapsed in receive queue due to low socket buffer
205 DSACKs sent for old packets
24 DSACKs received
117 connections reset due to unexpected data
32 connections reset due to early user close
12 connections aborted due to timeout
IpExt:
InMcastPkts: 92
OutMcastPkts: 109
InBcastPkts: 1272
OutBcastPkts: 537
sumber : blogcatalog.com
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