I am new to zerotier and am trying to do some performance testing between two machines communicating via zerotier using iperf3. Machine A (client) is running Linux Mint and Machine B (server) is running Fedora. When I do an iperf3 test with both machines on my home network WiFi using the server’s zerotier IP, things work as expected:
$ iperf3 -c 10.147.19.1 -p 5001
Connecting to host 10.147.19.1, port 5001
[ 5] local 10.147.19.3 port 34420 connected to 10.147.19.1 port 5001
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 5.60 MBytes 47.0 Mbits/sec 3 201 KBytes
[ 5] 1.00-2.00 sec 5.85 MBytes 49.0 Mbits/sec 0 247 KBytes
[ 5] 2.00-3.00 sec 6.45 MBytes 54.1 Mbits/sec 0 271 KBytes
[ 5] 3.00-4.00 sec 4.82 MBytes 40.4 Mbits/sec 2 215 KBytes
[ 5] 4.00-5.00 sec 6.33 MBytes 53.1 Mbits/sec 0 255 KBytes
[ 5] 5.00-6.00 sec 4.82 MBytes 40.4 Mbits/sec 2 209 KBytes
[ 5] 6.00-7.00 sec 4.46 MBytes 37.4 Mbits/sec 0 247 KBytes
[ 5] 7.00-8.00 sec 6.33 MBytes 53.1 Mbits/sec 0 266 KBytes
[ 5] 8.00-9.00 sec 5.49 MBytes 46.0 Mbits/sec 2 201 KBytes
[ 5] 9.00-10.00 sec 5.18 MBytes 43.5 Mbits/sec 0 250 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 55.3 MBytes 46.4 Mbits/sec 9 sender
[ 5] 0.00-10.02 sec 54.9 MBytes 45.9 Mbits/sec receiver
iperf Done.
When I disconnect the client from my home WiFi and connect to a public hotspot (server on my home LAN behind a NAT device + Firewall), the server doesn’t seem to be communicating back to the client after the test starts:
$ iperf3 -c 10.147.19.1 -p 5001
Connecting to host 10.147.19.1, port 5001
[ 5] local 10.147.19.3 port 50900 connected to 10.147.19.1 port 5001
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 85.9 KBytes 703 Kbits/sec 2 2.68 KBytes
[ 5] 1.00-2.00 sec 0.00 Bytes 0.00 bits/sec 1 2.68 KBytes
[ 5] 2.00-3.00 sec 0.00 Bytes 0.00 bits/sec 0 2.68 KBytes
[ 5] 3.00-4.00 sec 0.00 Bytes 0.00 bits/sec 1 2.68 KBytes
[ 5] 4.00-5.00 sec 0.00 Bytes 0.00 bits/sec 0 2.68 KBytes
[ 5] 5.00-6.00 sec 0.00 Bytes 0.00 bits/sec 0 2.68 KBytes
[ 5] 6.00-7.00 sec 0.00 Bytes 0.00 bits/sec 0 2.68 KBytes
[ 5] 7.00-8.00 sec 0.00 Bytes 0.00 bits/sec 1 2.68 KBytes
[ 5] 8.00-9.00 sec 0.00 Bytes 0.00 bits/sec 0 2.68 KBytes
[ 5] 9.00-10.00 sec 0.00 Bytes 0.00 bits/sec 0 2.68 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 85.9 KBytes 70.3 Kbits/sec 5 sender
[ 5] 0.00-10.03 sec 0.00 Bytes 0.00 bits/sec receiver
iperf Done.
Machine A is not running Ubuntu Firewall and Machine B has firewalld port 5001 open for TCP. Does anyone know what is going on or have any bright ideas? Thanks.