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e2e: fix sysctl settings that break cilium CNI on Fedora #707

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Sep 15, 2021
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6 changes: 6 additions & 0 deletions demo/lib/distro.bash
Original file line number Diff line number Diff line change
Expand Up @@ -744,6 +744,12 @@ touch /etc/sysctl.d/k8s.conf
echo "net.bridge.bridge-nf-call-ip6tables = 1" >> /etc/sysctl.d/k8s.conf
echo "net.bridge.bridge-nf-call-iptables = 1" >> /etc/sysctl.d/k8s.conf
echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.d/k8s.conf

# rp_filter (partially) mitigates DDOS attacks with spoofed IP addresses
# by dropping packages with non-routable (unanswerable) source addresses.
# However, rp_filter > 0 breaks cilium networking. Make sure it's disabled.
echo "net.ipv4.conf.*.rp_filter = 0" >> /etc/sysctl.d/k8s.conf
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/sbin/sysctl -p /etc/sysctl.d/k8s.conf
EOF
}
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