>>> iperf 2.0.13 Downloading
converted 'http://downloads.sourceforge.net/project/iperf2/iperf-2.0.13.tar.gz' (ANSI_X3.4-1968) -> 'http://downloads.sourceforge.net/project/iperf2/iperf-2.0.13.tar.gz' (UTF-8)
--2019-01-23 23:08:52--  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://netcologne.dl.sourceforge.net/project/iperf2/iperf-2.0.13.tar.gz [following]
converted 'https://netcologne.dl.sourceforge.net/project/iperf2/iperf-2.0.13.tar.gz' (ANSI_X3.4-1968) -> 'https://netcologne.dl.sourceforge.net/project/iperf2/iperf-2.0.13.tar.gz' (UTF-8)
--2019-01-23 23:08:52--  https://netcologne.dl.sourceforge.net/project/iperf2/iperf-2.0.13.tar.gz
Resolving netcologne.dl.sourceforge.net (netcologne.dl.sourceforge.net)... 2001:4dd0:1234:6::5f, 78.35.24.46
Connecting to netcologne.dl.sourceforge.net (netcologne.dl.sourceforge.net)|2001:4dd0:1234:6::5f|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 326148 (319K) [application/x-gzip]
Saving to: '/home/buildroot/build/instance-0/output/build/.iperf-2.0.13.tar.gz.et996a/output'

     0K .......... .......... .......... .......... .......... 15% 3.66M 0s
    50K .......... .......... .......... .......... .......... 31% 3.75M 0s
   100K .......... .......... .......... .......... .......... 47%  127M 0s
   150K .......... .......... .......... .......... .......... 62% 3.88M 0s
   200K .......... .......... .......... .......... .......... 78% 87.0M 0s
   250K .......... .......... .......... .......... .......... 94%  113M 0s
   300K .......... ........                                   100%  129M=0.04s

2019-01-23 23:08:52 (7.68 MB/s) - '/home/buildroot/build/instance-0/output/build/.iperf-2.0.13.tar.gz.et996a/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
converted 'http://sources.buildroot.net/iperf/iperf-2.0.13.tar.gz' (ANSI_X3.4-1968) -> 'http://sources.buildroot.net/iperf/iperf-2.0.13.tar.gz' (UTF-8)
--2019-01-23 23:08:52--  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, 104.25.211.19, ...
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 23:08:53 ERROR 404: Not Found.

converted 'http://sources.buildroot.net/iperf-2.0.13.tar.gz' (ANSI_X3.4-1968) -> 'http://sources.buildroot.net/iperf-2.0.13.tar.gz' (UTF-8)
--2019-01-23 23:08:53--  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 23:08:54 ERROR 404: Not Found.

package/pkg-generic.mk:135: recipe for target '/home/buildroot/build/instance-0/output/build/iperf-2.0.13/.stamp_downloaded' failed
make: *** [/home/buildroot/build/instance-0/output/build/iperf-2.0.13/.stamp_downloaded] Error 1
make: Leaving directory '/home/buildroot/build/instance-0/buildroot'