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From: JeongHwan Kim <frog007.kernel.kr@gmail.com>
To: kernelnewbies@kernelnewbies.org
Subject: TCP syn flooding protection
Date: Fri, 23 Apr 2021 15:45:54 +0900	[thread overview]
Message-ID: <0485e030-c915-14fa-5bff-c0a0895c295b@gmail.com> (raw)

Hi, everyone

I'm testing packet flooding test with old kernel version 2.6.30.
My board experienced process starvation when injecting ICMP flood with hping3 tool.
I modified softirq invocation routine to launch ksoftirqd instead of executing do_softirq
and I limitted the speed of ethernet phy to accept below 10Mbps.
It seems that the board can process flooding ICMP packets of 10Mbps,
but the board cannot process against TCP/UDP packet flooding,
the speed of processes become slow down.
IPtabls of which rule is dropping all TCP/UDP packet does not improve the situation.
How can I protect the TCP/UDP flooding in my environment.

Thanks in advance.
Kim





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             reply	other threads:[~2021-04-23  6:46 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-23  6:45 JeongHwan Kim [this message]
2021-04-23  8:19 ` TCP syn flooding protection Valdis Klētnieks

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