iperf3 with SCTP on CentOS 8.1.1911

[bbahes]

Hello to everyone in community!

I want to test SCTP protocol with iperf3 between two CentOS 8.1.1911 virtual machines.
However, when I try command

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iperf3 -c 172.16.1.40 --sctp

I get this message:

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iperf3: unrecognized option '--sctp'

.

Thanks!

[TrevorH]

The man page makes lots of mention of SCTP but does not appear to contain any switch to make it be used. Running iperf3 --help similarly also makes no mention of SCTP in it anywhere. Google finds hits that say to use --sctp but that's not valid. I also found mention of using -z but that isn't valid either. I also saw mention of it needing a kernel module called lksctp but that doesn't appear to be in the el8 kernel so either it's changed name or it isn't there.

[bbahes]

The man page makes lots of mention of SCTP but does not appear to contain any switch to make it be used. Running iperf3 --help similarly also makes no mention of SCTP in it anywhere. Google finds hits that say to use --sctp but that's not valid. I also found mention of using -z but that isn't valid either. I also saw mention of it needing a kernel module called lksctp but that doesn't appear to be in the el8 kernel so either it's changed name or it isn't there.

When I try iperf3 --version I get:

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iperf 3.7+ (cJSON 1.5.2)
Linux centos 4.18.0-147.3.1.el8_1.x86_64 #1 SMP Fri Jan 3 23:55:26 UTC 2020 x86_64
Optional features available: CPU affinity setting, IPv6 flow label, TCP congestion algorithm setting, sendfile / zerocopy, socket pacing

Running same on Ubuntu 18.04 I get:

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iperf 3.7 (cJSON 1.5.2)
Linux ubuntu 4.15.0-74-generic #84-Ubuntu SMP Thu Dec 19 08:06:28 UTC 2019 x86_64
Optional features available: CPU affinity setting, IPv6 flow label, SCTP, TCP congestion algorithm setting, sendfile / zerocopy, socket pacing, authentication

Also, running these:

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checksctp
SCTP supported

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lsmod | grep sctp
sctp                  397312  2
libcrc32c              16384  2 xfs,sctp

[TrevorH]

I don't have a copy of RHEL 8 avaIlable (my Developer Subscription free copy is used up on an RHEL 7 test VM) but it might be interesting to know if the same thing occurs on a RHEL 8 system too or if this is a CentOS bug.