[23] Przepustowość sieci

Zainstaluj [iperf], aby sprawdzić przepustowość sieci. Wymaga 2 hostów, hosta nadawcy i hosta odbiornika.
Schemat sieci przedstawia się następująco:

[1] Zainstaluj [iperf3] na każdym z hostów.

[root@vlsr02 ~]# dnf install iperf3

[2] Jeśli jest zainstalowany Firewalld zezwól na ruch na porcie [5201] na obu hostach.

[root@vlsr02 ~]# firewall-cmd --add-port=5201/tcp --permanent
[root@vlsr02 ~]# firewall-cmd –reload

[3] Uruchom poniższą komendę na hoście odbiorniku.

[root@vlsr02 ~]# iperf3 -s
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------

[4] Sprawdź przepustowość sieci uruchamiając poniższą komendę na hoście nadawcy. Poniższy test pokazuje: w czasie testu przez sieć przesłano 27,1GBajta, zaś przepustowość sieci kształtowała się na poziomie 23,1GBita/sekundę.

[root@vlsr03 ~]# iperf3 -c vlsr02.zicher.lab

Connecting to host vlsr02.zicher.lab, port 5201
[ 5] local 192.168.100.103 port 42196 connected to 192.168.100.102 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 2.30 GBytes 19.8 Gbits/sec 0 1.03 MBytes
[ 5] 1.00-2.00 sec 2.74 GBytes 23.5 Gbits/sec 0 1.14 MBytes
[ 5] 2.00-3.00 sec 2.77 GBytes 23.8 Gbits/sec 0 1.14 MBytes
[ 5] 3.00-4.00 sec 2.77 GBytes 23.8 Gbits/sec 0 1.14 MBytes
[ 5] 4.00-5.00 sec 2.75 GBytes 23.6 Gbits/sec 0 1.14 MBytes
[ 5] 5.00-6.00 sec 2.76 GBytes 23.7 Gbits/sec 0 1.14 MBytes
[ 5] 6.00-7.00 sec 2.75 GBytes 23.6 Gbits/sec 0 1.14 MBytes
[ 5] 7.00-8.00 sec 2.75 GBytes 23.6 Gbits/sec 0 1.14 MBytes
[ 5] 8.00-9.00 sec 2.74 GBytes 23.5 Gbits/sec 0 1.14 MBytes
[ 5] 9.00-10.00 sec 2.73 GBytes 23.4 Gbits/sec 0 1.14 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 27.1 GBytes 23.2 Gbits/sec 0 sender
[ 5] 0.00-10.00 sec 27.1 GBytes 23.2 Gbits/sec receiver

iperf Done.

[5] Możliwe jest dokładniejsze i bardziej rozbudowane sprawdzenie sieci, używając różnych opcji i przełączników.

[root@vlsr02 ~]# iperf3 --help

Usage: iperf3 [-s|-c host] [options]
iperf3 [-h|--help] [-v|--version]

Server or Client:
-p, --port # server port to listen on/connect to
-f, --format [kmgtKMGT] format to report: Kbits, Mbits, Gbits, Tbits
-i, --interval # seconds between periodic throughput reports
-F, --file name xmit/recv the specified file
-A, --affinity n/n,m set CPU affinity
-B, --bind <host> bind to the interface associated with the address <host>
-V, --verbose more detailed output
-J, --json output in JSON format
--logfile f send output to a log file
--forceflush force flushing output at every interval
-d, --debug emit debugging output
-v, --version show version information and quit
-h, --help show this message and quit
Server specific:
-s, --server run in server mode
-D, --daemon run the server as a daemon
-I, --pidfile file write PID file
-1, --one-off handle one client connection then exit
--rsa-private-key-path path to the RSA private key used to decrypt
authentication credentials
--authorized-users-path path to the configuration file containing user
credentials
Client specific:
-c, --client <host> run in client mode, connecting to <host>
--sctp use SCTP rather than TCP
-X, --xbind <name> bind SCTP association to links
--nstreams # number of SCTP streams
-u, --udp use UDP rather than TCP
--connect-timeout # timeout for control connection setup (ms)
-b, --bitrate #[KMG][/#] target bitrate in bits/sec (0 for unlimited)
(default 1 Mbit/sec for UDP, unlimited for TCP)
(optional slash and packet count for burst mode)
--pacing-timer #[KMG] set the timing for pacing, in microseconds (default 1000)
--fq-rate #[KMG] enable fair-queuing based socket pacing in
bits/sec (Linux only)
-t, --time # time in seconds to transmit for (default 10 secs)
-n, --bytes #[KMG] number of bytes to transmit (instead of -t)
-k, --blockcount #[KMG] number of blocks (packets) to transmit (instead of -t or -n)
-l, --length #[KMG] length of buffer to read or write
(default 128 KB for TCP, dynamic or 1460 for UDP)
--cport <port> bind to a specific client port (TCP and UDP, default: ephemeral port)
-P, --parallel # number of parallel client streams to run
-R, --reverse run in reverse mode (server sends, client receives)
-w, --window #[KMG] set window size / socket buffer size
-C, --congestion <algo> set TCP congestion control algorithm (Linux and FreeBSD only)
-M, --set-mss # set TCP/SCTP maximum segment size (MTU - 40 bytes)
-N, --no-delay set TCP/SCTP no delay, disabling Nagle's Algorithm
-4, --version4 only use IPv4
-6, --version6 only use IPv6
-S, --tos N set the IP type of service, 0-255.
The usual prefixes for octal and hex can be used,
i.e. 52, 064 and 0x34 all specify the same value.
--dscp N or --dscp val set the IP dscp value, either 0-63 or symbolic.
Numeric values can be specified in decimal,
octal and hex (see --tos above).
-L, --flowlabel N set the IPv6 flow label (only supported on Linux)
-Z, --zerocopy use a 'zero copy' method of sending data
-O, --omit N omit the first n seconds
-T, --title str prefix every output line with this string
--get-server-output get results from server
--udp-counters-64bit use 64-bit counters in UDP test packets
--username username for authentication
--rsa-public-key-path path to the RSA public key used to encrypt
authentication credentials

[KMG] indicates options that support a K/M/G suffix for kilo-, mega-, or giga-

iperf3 homepage at: http://software.es.net/iperf/
Report bugs to: https://github.com/esnet/iperf