Public bug reported:
I found the parameter tcp_mtu_probe_floor
I need an additional parameter tcp_mtu_probe_ceiling
why ?
If the tcp-connection goes only in a broadcast domain
(no IPv4 router in between, sending ICMP frag needed)
the pathMTU algorithm goes crasy.
I have 2 nodes IPv4 10.0.0.2 (ethernet cable) and 10.0.0.4 (802.11n)
testing with "iperf3 -s -i 5" as server on Ubuntu 20.04 LTS (10.0.0.2)
and ANDROID12 "MAGIC iperf3" as client (iperf3 -c 10.0.0.2 -t 22 -i 5 -P 1 -Z
-O 5)
(10.0.0.4)
monitoring with wireshark shows ip packets with ip.len 65212 and tcp flags
push,ack.
this does not work with the HW buffers of the LANIC,
therefore a reqest a control with parameter "tcp_mtu_probe_ceiling"
** Affects: kernel-package (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1953030
Title:
pathMTU tuning needs parameter tcp_mtu_probe_ceiling
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