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Merge pull request #3881 from shaneutt/shaneutt/fix-arp-ignore

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fix: set global arp_ignore param for kindnet
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Kubernetes Prow Robot
2025-03-11 17:01:46 -07:00
committed by GitHub
parent 022bedd494 5e66ec05a5
commit b98dc21ad3
1 changed files with 14 additions and 0 deletions
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14
images/base/files/etc/sysctl.d/10-network-magic.conf
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@@ -9,3 +9,17 @@
# Kubernetes mitigates the possible security issue caused by enabling this option.
# ref: https://nvd.nist.gov/vuln/detail/CVE-2020-8558
net.ipv4.conf.all.route_localnet=1
# The global kernel parameter net.ipv4.conf.all.arp_ignore governs the
# conditions under which ARP requests will be accepted or ignored. This global
# setting will override any individual interface settings. Some host systems
# might set this global parameter to a more restrictive setting of 2 (or
# greater). Specifically, in mode 2, the system ignores ARP requests directed to
# /32 addresses (this is what kindnet assigns to its veth interfaces) because
# the request originates from a different subnet. This behavior breaks routing
# for kindnet (specifically the ptp plugin), so we opinionatedly set this to 0
# when kindnet is in use to ensure proper networking.
#
# For more information see:
# https://www.kernel.org/doc/html/latest/networking/ip-sysctl.html#arp_ignore
net.ipv4.conf.all.arp_ignore=0