My coffee-shop-speed-test.sh started to give an error message: `1.1.1.1:
nodename nor servname provided, or not known` This appears to occur because
`fping -6` attempts to ping an IPv4 address, 1.1.1.1. (see full output below).
This doesn't happen when I set `--te_ping_hosts=2606:4700:4700::1111` in the
flent command - it runs without errors.
I haven't changed the script (that calls flent) for a while. Why might this
error have cropped up recently? (I had been using `Flent 1.9.9-git-fa47b0f
using Python 3.7.3.` I upgraded today to `Flent 1.9.9-git-25af65f ` to see if
that made a difference. Both produce the error. Thanks.
```
bash-3.2$ flent -x -H flent-fremont.bufferbloat.net -t "Home"
--te=ping_hosts=1.1.1.1 --te=download_streams=4 tcp_ndown
Started Flent 1.9.9-git-25af65f using Python 3.7.4.
Starting tcp_ndown test. Expected run time: 70 seconds.
WARNING: Program exited non-zero.
Runner class: PingRunner
Command: /usr/local/sbin/fping -6 -D -p 200 -c 350 -t 140000 1.1.1.1
Return code: 2
Stdout:
Stderr: 1.1.1.1: nodename nor servname provided, or not known
WARNING: Command produced no valid data.
Runner class: PingRunner
Command: /usr/local/sbin/fping -6 -D -p 200 -c 350 -t 140000 1.1.1.1
Return code: 2
Stdout:
Stderr: 1.1.1.1: nodename nor servname provided, or not known
Data file written to ./tcp_ndown-2020-01-31T011030.307579.Home.flent.gz
Summary of tcp_ndown test run from 2020-01-31 06:10:30.307579
Title: 'Home'
avg median # data pts
Ping (ms) ICMP : 102.00 103.00 ms 353
Ping (ms) ICMP 1.1.1.1 (extra) : No data.
TCP download avg : 1.55 N/A Mbits/s 353
TCP download sum : 6.22 N/A Mbits/s 353
TCP download::1 : 1.63 1.68 Mbits/s 353
TCP download::2 : 1.31 1.30 Mbits/s 353
TCP download::3 : 1.86 1.93 Mbits/s 353
TCP download::4 : 1.42 1.45 Mbits/s 353
bash-3.2$
```
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