171c43dca8
set net.ipv4.tcp_tw_recycle=1 to avoid dnat conntrack invalid The probe connection action before going to time_wait state. Probe connection controller pod TCP FLAG SEQ ACK controller:50538 ---> endpoint:9292 SYN 2707980036 0 controller:50538 <--- endpoint:9292 SYN ACK 1599414185 2707980037 controller:50538 ---> endpoint:9292 ACK 2707980037 1599414186 controller:50538 ---> endpoint:9292 FIN ACK 2707980037 1599414186 controller:50538 <--- endpoint:9292 ACK 1599414186 2707980038 controller:50538 <--- endpoint:9292 FIN ACK 1599414186 2707980038 controller:50538 ---> endpoint:9292 ACK 2707980038 1599414187 And for the curl command connection with same port 50538: it will be like controller pod TCP FLAG SEQ ACK controller:50538 --> service:9292 SYN 2917708674 0 controller:50538 --> endpoint:9292 SYN 2917708674 0 controller:24479 <-- endpoint:9292 SYN ACK 2742336307 2917708675 controller:50538 <-- endpoint:9292 SYN ACK 2742336307 2917708675 controller:50538 --> service:9292 ACK 2707980038 1599414187 controller:50538 --> service:9292 ACK 2707980038 1599414187 controller:50538 --> service:9292 ACK(DROP) 2707980038 1599414187 The last ACK(controller:50538-->service:9292) SEQ and ACK is same as Probe TIME_WAIT latest ACK’s. from https://github.com/torvalds/linux/blob/v3.10/net/ipv4/tcp_ipv4.c#L2002 , it only check (des ip , des port, src ip, and src port).Because this is not a correct SEQ/ACK , then it is set invalid and then dropped. If enabling tcp_tw_recycle, the previous socket should be already closed, then the issue should be gone. Closes-Bug: 1817936 Change-Id: If6e66d85f08fc99022946fd2e9f4e5756bfb7b2f Signed-off-by: Sun Austin <austin.sun@intel.com>
88 lines
2.8 KiB
Plaintext
88 lines
2.8 KiB
Plaintext
# This configuration file is taken from Debian.
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#
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# /etc/sysctl.conf - Configuration file for setting system variables
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# See sysctl.conf (5) for information.
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#
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#kernel.domainname = example.com
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# Uncomment the following to stop low-level messages on console
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kernel.printk = 4 4 1 7
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# Reboot X seconds after a kernel panic
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kernel.panic = 5
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##############################################################3
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# Functions previously found in netbase
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#
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# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
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# Turn on Source Address Verification in all interfaces to
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# prevent some spoofing attacks
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net.ipv4.conf.default.rp_filter=1
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net.ipv4.conf.all.rp_filter=1
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# Uncomment the next line to enable TCP/IP SYN cookies
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#net.ipv4.tcp_syncookies=1
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# Uncomment the next line to enable packet forwarding for IPv4
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#net.ipv4.ip_forward=1
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# Uncomment the next line to enable packet forwarding for IPv6
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#net.ipv6.conf.all.forwarding=1
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###################################################################
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# Additional settings - these settings can improve the network
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# security of the host and prevent against some network attacks
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# including spoofing attacks and man in the middle attacks through
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# redirection. Some network environments, however, require that these
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# settings are disabled so review and enable them as needed.
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#
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# Ignore ICMP broadcasts
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#net.ipv4.icmp_echo_ignore_broadcasts = 1
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#
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# Ignore bogus ICMP errors
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#net.ipv4.icmp_ignore_bogus_error_responses = 1
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#
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# Do not accept ICMP redirects (prevent MITM attacks)
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#net.ipv4.conf.all.accept_redirects = 0
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#net.ipv6.conf.all.accept_redirects = 0
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# _or_
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# Accept ICMP redirects only for gateways listed in our default
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# gateway list (enabled by default)
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# net.ipv4.conf.all.secure_redirects = 1
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#
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# Do not send ICMP redirects (we are not a router)
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#net.ipv4.conf.all.send_redirects = 0
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#
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# Do not accept IP source route packets (we are not a router)
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#net.ipv4.conf.all.accept_source_route = 0
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#net.ipv6.conf.all.accept_source_route = 0
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#
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# Log Martian Packets
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#net.ipv4.conf.all.log_martians = 1
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#
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#kernel.shmmax = 141762560
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# Limit local port range
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net.ipv4.ip_local_port_range = 49216 61000
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net.ipv4.tcp_tw_reuse = 1
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# Fix https://bugs.launchpad.net/starlingx/+bug/1817936
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net.ipv4.tcp_tw_recycle = 1
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# WRL
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# set max socket memory ; default was 212992
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net.core.rmem_max=425984
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# WRS
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# The following kernel parameters help alleviate some RabbitMQ
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# connection issues. These values need to be set here to ensure sysinv-agent
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# remains connected to rabbitmq. Sysinv-agent starts before packstack and the
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# long default values allowed the connection to be lost for 2 hours.
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# Note the ipv4 vlaues are also applied to ipv6 connections.
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net.ipv4.tcp_keepalive_intvl = 1
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net.ipv4.tcp_keepalive_probes = 5
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net.ipv4.tcp_keepalive_time = 5
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