Hi,
I'm testing on master with a ublox TOBY L200 using the RNDIS interface.
I'm finding that I can ping reliably (~100ms latency to Google), and I
can access HTTP and FTP. However, the moment I try anything with HTTPS
or TLS, I just get timeouts. In wireshark, I'm seeing a lot of TCP
spurious retransmission and TCP Dup ACK.
Additional notes:
- I'm using router mode.
- I'm using T-Mobile in the USA.
- Switching to the ECM interface works, but the speed is low (~500kbps,
3G, on a connection that can do ~5mbps using a different modem).
- Disabling the "RNDIS driver optimization" (AT+UDCONF=67,0) fixes the
issue but results in the same slow (~500kbps) speeds.
- I noticed someone on the ublox forum had a similar-sounding issue that
they claim was caused by some regression in a 4.9 kernel. Their issue
was also fixed with AT+UDCONF=67,0 but they did not mention if the
performance changed. Full details here:
https://forum.u-blox.com/index.php/16851/mpcie-toby-l210-02s-not-working-with-newer-linux-kernel
- I saw identical behavior on the L201.
- In case it matters, I'm on Debian Stretch with a 4.9.88-1+deb9u1 kernel.
Any idea what might be wrong? Is anyone else seeing this, or are you
seeing high speeds on the TOBY L2 with RNDIS?
Thanks,
Martin
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