graphene-os-server-infrastr.../sysctl.d/local.conf
Daniel Micay f9425e3ebd reduce conntrack UDP timeouts
This only applies to outbound NTP requests since we use notrack for our
UDP services and DNS-over-TLS for our local resolver. We'd have no need
for longer timeouts even if that wasn't the case.
2024-04-30 12:13:02 -04:00

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net.ipv6.bindv6only = 1
net.ipv4.ip_local_port_range = 1024 65535
net.ipv4.conf.*.send_redirects = 0
net.ipv4.conf.*.accept_redirects = 0
net.ipv6.conf.*.accept_redirects = 0
# enforced with nftables to handle both IPv4 and IPv6 in the same way
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.*.rp_filter = 0
net.ipv4.tcp_ecn = 1
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_shrink_window = 1
net.ipv4.tcp_notsent_lowat = 131072
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_rfc1337 = 1
net.ipv4.tcp_tw_reuse = 1
# 31s with initial 1s RTO
net.ipv4.tcp_syn_retries = 4
net.netfilter.nf_conntrack_tcp_timeout_syn_sent = 31
# 15s with initial 1s RTO
net.ipv4.tcp_synack_retries = 3
net.netfilter.nf_conntrack_tcp_timeout_syn_recv = 15
# 102.2s with minimum 0.2s RTO
net.ipv4.tcp_retries2 = 8
# 25.4s with minimum 0.2s RTO
net.ipv4.tcp_orphan_retries = 6
net.mptcp.enabled = 0
net.netfilter.nf_conntrack_tcp_loose = 0
net.netfilter.nf_conntrack_tcp_timeout_established = 14400
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 60
net.netfilter.nf_conntrack_udp_timeout = 15
net.netfilter.nf_conntrack_udp_timeout_stream = 15
net.netfilter.nf_conntrack_expect_max = 1
kernel.yama.ptrace_scope = 2
vm.mmap_rnd_bits = 32
vm.mmap_rnd_compat_bits = 16
kernel.kptr_restrict = 2
kernel.unprivileged_userns_clone = 0
kernel.unprivileged_bpf_disabled = 1
net.core.bpf_jit_harden = 2
kernel.kexec_load_disabled = 1
fs.protected_regular = 2
fs.protected_fifos = 2
kernel.panic = -1
kernel.panic_on_oops = 1
dev.tty.ldisc_autoload = 0
fs.binfmt_misc.status = 0
kernel.sched_energy_aware = 0