>>> iperf 2.0.13 Downloading
--2019-01-23 14:42:52--  http://downloads.sourceforge.net/project/iperf2/iperf-2.0.13.tar.gz
Resolving downloads.sourceforge.net (downloads.sourceforge.net)... 216.105.38.13
Connecting to downloads.sourceforge.net (downloads.sourceforge.net)|216.105.38.13|:80... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://pilotfiber.dl.sourceforge.net/project/iperf2/iperf-2.0.13.tar.gz [following]
--2019-01-23 14:42:52--  https://pilotfiber.dl.sourceforge.net/project/iperf2/iperf-2.0.13.tar.gz
Loaded CA certificate '/etc/ssl/certs/ca-certificates.crt'
Resolving pilotfiber.dl.sourceforge.net (pilotfiber.dl.sourceforge.net)... 69.12.26.12
Connecting to pilotfiber.dl.sourceforge.net (pilotfiber.dl.sourceforge.net)|69.12.26.12|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 326148 (319K) [application/x-gzip]
Saving to: '/data/buildroot/buildroot-test/instance-1/output/build/.iperf-2.0.13.tar.gz.5kTpPB/output'

     0K .......... .......... .......... .......... .......... 15%  264K 1s
    50K .......... .......... .......... .......... .......... 31%  394K 1s
   100K .......... .......... .......... .......... .......... 47%  737K 0s
   150K .......... .......... .......... .......... .......... 62%  776K 0s
   200K .......... .......... .......... .......... .......... 78%  731K 0s
   250K .......... .......... .......... .......... .......... 94%  742K 0s
   300K .......... ........                                   100%  657K=0.6s

2019-01-23 14:42:53 (520 KB/s) - '/data/buildroot/buildroot-test/instance-1/output/build/.iperf-2.0.13.tar.gz.5kTpPB/output' saved [326148/326148]

ERROR: iperf-2.0.13.tar.gz has wrong sha1 hash:
ERROR: expected: 3eb21c329af811af53a2c816e1ed26b3dd2c259f
ERROR: got     : 0c7625c61087b9e6866421abb8bb533658b40a8d
ERROR: Incomplete download, or man-in-the-middle (MITM) attack
--2019-01-23 14:42:53--  http://sources.buildroot.net/iperf/iperf-2.0.13.tar.gz
Resolving sources.buildroot.net (sources.buildroot.net)... 2606:4700:20::6819:d313, 2606:4700:20::6819:d213, 104.25.210.19, ...
Connecting to sources.buildroot.net (sources.buildroot.net)|2606:4700:20::6819:d313|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2019-01-23 14:42:54 ERROR 404: Not Found.

--2019-01-23 14:42:54--  http://sources.buildroot.net/iperf-2.0.13.tar.gz
Resolving sources.buildroot.net (sources.buildroot.net)... 2606:4700:20::6819:d213, 2606:4700:20::6819:d313, 104.25.211.19, ...
Connecting to sources.buildroot.net (sources.buildroot.net)|2606:4700:20::6819:d213|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2019-01-23 14:42:54 ERROR 404: Not Found.

make: *** [package/pkg-generic.mk:138: /data/buildroot/buildroot-test/instance-1/output/build/iperf-2.0.13/.stamp_downloaded] Error 1
make: Leaving directory '/data/buildroot/buildroot-test/instance-1/buildroot'