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{
boot = {
kernelModules = [
"tls"
"tcp_bbr"
];
kernel.sysctl = {
# TCP hardening
# Prevent bogus ICMP errors from filling up logs.
"net.ipv4.icmp_ignore_bogus_error_responses" = 1;
# Reverse path filtering causes the kernel to do source validation of
# packets received from all interfaces. This can mitigate IP spoofing.
"net.ipv4.conf.default.rp_filter" = 1;
"net.ipv4.conf.all.rp_filter" = 1;
# Do not accept IP source route packets (we're not a router)
"net.ipv4.conf.all.accept_source_route" = 0;
"net.ipv6.conf.all.accept_source_route" = 0;
# Don't send ICMP redirects (again, we're on a router)
"net.ipv4.conf.all.send_redirects" = 0;
"net.ipv4.conf.default.send_redirects" = 0;
# Refuse ICMP redirects (MITM mitigations)
"net.ipv4.conf.all.accept_redirects" = 0;
"net.ipv4.conf.default.accept_redirects" = 0;
"net.ipv4.conf.all.secure_redirects" = 0;
"net.ipv4.conf.default.secure_redirects" = 0;
"net.ipv6.conf.all.accept_redirects" = 0;
"net.ipv6.conf.default.accept_redirects" = 0;
# Protects against SYN flood attacks
"net.ipv4.tcp_syncookies" = 1;
# Incomplete protection again TIME-WAIT assassination
"net.ipv4.tcp_rfc1337" = 1;
# And other stuff
"net.ipv4.conf.all.log_martians" = true;
"net.ipv4.conf.default.log_martians" = true;
"net.ipv4.icmp_echo_ignore_broadcasts" = true;
"net.ipv6.conf.default.accept_ra" = 0;
"net.ipv6.conf.all.accept_ra" = 0;
"net.ipv4.tcp_timestamps" = 0;
# TCP optimization
# TCP Fast Open is a TCP extension that reduces network latency by packing
# data in the sender’s initial TCP SYN. Setting 3 = enable TCP Fast Open for
# both incoming and outgoing connections:
"net.ipv4.tcp_fastopen" = 3;
# Bufferbloat mitigations + slight improvement in throughput & latency
"net.ipv4.tcp_congestion_control" = "bbr";
"net.core.default_qdisc" = "cake";
# Other stuff that I am too lazy to document
"net.core.optmem_max" = 65536;
"net.core.rmem_default" = 1048576;
"net.core.rmem_max" = 16777216;
"net.core.somaxconn" = 8192;
"net.core.wmem_default" = 1048576;
"net.core.wmem_max" = 16777216;
"net.ipv4.ip_local_port_range" = "16384 65535";
"net.ipv4.tcp_max_syn_backlog" = 8192;
"net.ipv4.tcp_max_tw_buckets" = 2000000;
"net.ipv4.tcp_mtu_probing" = 1;
"net.ipv4.tcp_rmem" = "4096 1048576 2097152";
"net.ipv4.tcp_slow_start_after_idle" = 0;
"net.ipv4.tcp_tw_reuse" = 1;
"net.ipv4.tcp_wmem" = "4096 65536 16777216";
"net.ipv4.udp_rmem_min" = 8192;
"net.ipv4.udp_wmem_min" = 8192;
"net.netfilter.nf_conntrack_generic_timeout" = 60;
"net.netfilter.nf_conntrack_max" = 1048576;
"net.netfilter.nf_conntrack_tcp_timeout_established" = 600;
"net.netfilter.nf_conntrack_tcp_timeout_time_wait" = 1;
};
};
}
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