$tcpinfo_rtt, $tcpinfo_rttvar, $tcpinfo_snd_cwnd, $tcpinfo_rcv_space
information about the client TCP connection; available on systems that support the TCP_INFO socket option
Estou tentando descobrir uma maneira de detectar tempos de ida e volta para cada IP que se conecta à porta 80 em meu servidor. O que é uma boa maneira de fazer isso?
Existem muitas conexões e o ping de cada ip não é prático. Eu estava pensando, de alguma forma, medir a diferença de tempo entre quando o servidor envia o pacote syn / ack e quando o servidor recebe a confirmação para ele.
Existe uma maneira de registrar isso mais barato? Talvez usando algum filtro tcpdump mágico?
O objetivo deste exercício é agregar os dados e calcular se há alguma ineficiência de roteamento. Diga um ISP em uma região, talvez roteando incorretamente, etc.
FWIW o servidor da web é nginx.
$tcpinfo_rtt, $tcpinfo_rttvar, $tcpinfo_snd_cwnd, $tcpinfo_rcv_space
information about the client TCP connection; available on systems that support the TCP_INFO socket option
Se você tem acesso a uma máquina linux ou unix 1 , você deve usar tcptrace . Tudo o que você precisa fazer é capturar o tráfego do cliente com wireshark ou tcpdump para um arquivo pcap.
Depois de ter esse arquivo .pcap
2 , analise com tcptrace -xtraffic <pcap_filename>
3 . Isso gerará dois arquivos de texto e as estatísticas RTT médias de todas as conexões nesse pcap serão mostradas na parte inferior da chamada traffic_stats.dat
.
[mpenning@Bucksnort tcpperf]$ tcptrace -xtraffic willers.pcap
mod_traffic: characterizing traffic
1 arg remaining, starting with 'willers.pcap'
Ostermann's tcptrace -- version 6.6.1 -- Wed Nov 19, 2003
16522 packets seen, 16522 TCP packets traced
elapsed wallclock time: 0:00:00.200709, 82318 pkts/sec analyzed
trace file elapsed time: 0:03:21.754962
Dumping port statistics into file traffic_byport.dat
Dumping overall statistics into file traffic_stats.dat
Plotting performed at 15.000 second intervals
[mpenning@Bucksnort tcpperf]$
[mpenning@Bucksnort tcpperf]$ cat traffic_stats.dat
Overall Statistics over 201 seconds (0:03:21.754962):
4135308 ttl bytes sent, 20573.672 bytes/second
4135308 ttl non-rexmit bytes sent, 20573.672 bytes/second
0 ttl rexmit bytes sent, 0.000 bytes/second
16522 packets sent, 82.199 packets/second
200 connections opened, 0.995 conns/second
11 dupacks sent, 0.055 dupacks/second
0 rexmits sent, 0.000 rexmits/second
average RTT: 67.511 msecs <------------------
[mpenning@Bucksnort tcpperf]$
O arquivo .pcap
usado neste exemplo foi uma captura gerada quando passei por um script expect
que extraía dados de um dos meus servidores. Foi assim que eu gerou o loop ...
#!/usr/bin/python
from subprocess import Popen, PIPE
import time
for ii in xrange(0,200):
# willers.exp is an expect script
Popen(['./willers.exp'], stdin=PIPE, stdout=PIPE, stderr=PIPE)
time.sleep(1)
tcptrace
é capaz de estatísticas detalhadas por soquete se você usar outras opções ... ================================ [mpenning@Bucksnort tcpperf]$ tcptrace -lr willers.pcap 1 arg remaining, starting with 'willers.pcap' Ostermann's tcptrace -- version 6.6.1 -- Wed Nov 19, 2003 16522 packets seen, 16522 TCP packets traced elapsed wallclock time: 0:00:00.080496, 205252 pkts/sec analyzed trace file elapsed time: 0:03:21.754962 TCP connection info: 200 TCP connections traced: TCP connection 1: host c: myhost.local:44781 host d: willers.local:22 complete conn: RESET (SYNs: 2) (FINs: 1) first packet: Tue May 31 22:52:24.154801 2011 last packet: Tue May 31 22:52:25.668430 2011 elapsed time: 0:00:01.513628 total packets: 73 filename: willers.pcap c->d: d->c: total packets: 34 total packets: 39 resets sent: 4 resets sent: 0 ack pkts sent: 29 ack pkts sent: 39 pure acks sent: 11 pure acks sent: 2 sack pkts sent: 0 sack pkts sent: 0 dsack pkts sent: 0 dsack pkts sent: 0 max sack blks/ack: 0 max sack blks/ack: 0 unique bytes sent: 2512 unique bytes sent: 14336 actual data pkts: 17 actual data pkts: 36 actual data bytes: 2512 actual data bytes: 14336 rexmt data pkts: 0 rexmt data pkts: 0 rexmt data bytes: 0 rexmt data bytes: 0 zwnd probe pkts: 0 zwnd probe pkts: 0 zwnd probe bytes: 0 zwnd probe bytes: 0 outoforder pkts: 0 outoforder pkts: 0 pushed data pkts: 17 pushed data pkts: 33 SYN/FIN pkts sent: 1/1 SYN/FIN pkts sent: 1/0 req 1323 ws/ts: Y/Y req 1323 ws/ts: Y/Y adv wind scale: 6 adv wind scale: 1 req sack: Y req sack: Y sacks sent: 0 sacks sent: 0 urgent data pkts: 0 pkts urgent data pkts: 0 pkts urgent data bytes: 0 bytes urgent data bytes: 0 bytes mss requested: 1460 bytes mss requested: 1460 bytes max segm size: 792 bytes max segm size: 1448 bytes min segm size: 16 bytes min segm size: 32 bytes avg segm size: 147 bytes avg segm size: 398 bytes max win adv: 40832 bytes max win adv: 66608 bytes min win adv: 5888 bytes min win adv: 66608 bytes zero win adv: 0 times zero win adv: 0 times avg win adv: 14035 bytes avg win adv: 66608 bytes initial window: 32 bytes initial window: 40 bytes initial window: 1 pkts initial window: 1 pkts ttl stream length: 2512 bytes ttl stream length: NA missed data: 0 bytes missed data: NA truncated data: 0 bytes truncated data: 0 bytes truncated packets: 0 pkts truncated packets: 0 pkts data xmit time: 1.181 secs data xmit time: 1.236 secs idletime max: 196.9 ms idletime max: 196.9 ms throughput: 1660 Bps throughput: 9471 Bps RTT samples: 18 RTT samples: 24 RTT min: 43.8 ms RTT min: 0.0 ms RTT max: 142.5 ms RTT max: 7.2 ms RTT avg: 68.5 ms RTT avg: 0.7 ms RTT stdev: 35.8 ms RTT stdev: 1.6 ms RTT from 3WHS: 80.8 ms RTT from 3WHS: 0.0 ms RTT full_sz smpls: 1 RTT full_sz smpls: 3 RTT full_sz min: 142.5 ms RTT full_sz min: 0.0 ms RTT full_sz max: 142.5 ms RTT full_sz max: 0.0 ms RTT full_sz avg: 142.5 ms RTT full_sz avg: 0.0 ms RTT full_sz stdev: 0.0 ms RTT full_sz stdev: 0.0 ms post-loss acks: 0 post-loss acks: 0 segs cum acked: 0 segs cum acked: 9 duplicate acks: 0 duplicate acks: 1 triple dupacks: 0 triple dupacks: 0 max # retrans: 0 max # retrans: 0 min retr time: 0.0 ms min retr time: 0.0 ms max retr time: 0.0 ms max retr time: 0.0 ms avg retr time: 0.0 ms avg retr time: 0.0 ms sdv retr time: 0.0 ms sdv retr time: 0.0 ms ================================