sysctl: Use strict Reverse Path Filtering

[ipfire-2.x.git] / config / etc / sysctl.conf

diff --git a/config/etc/sysctl.conf b/config/etc/sysctl.conf
index df3ef5f96a08543d78d93abe1adade575766e0a2..7fe397bb71a1fa7b6ce21aae58e7cf5ade8da932 100644 (file)
--- a/config/etc/sysctl.conf
+++ b/config/etc/sysctl.conf
@@ -1,7 +1,10 @@
 net.ipv4.ip_forward = 1
 net.ipv4.ip_dynaddr = 1
+
 net.ipv4.icmp_echo_ignore_broadcasts = 1
 net.ipv4.icmp_ignore_bogus_error_responses = 1
+net.ipv4.icmp_ratelimit = 1000
+net.ipv4.icmp_ratemask = 6168
 
 net.ipv4.tcp_syncookies = 1
 net.ipv4.tcp_fin_timeout = 30
@@ -9,22 +12,95 @@ net.ipv4.tcp_syn_retries = 3
 net.ipv4.tcp_synack_retries = 3
 
 net.ipv4.conf.default.arp_filter = 1
-net.ipv4.conf.default.rp_filter = 0
+net.ipv4.conf.default.rp_filter = 1
 net.ipv4.conf.default.accept_redirects = 0
 net.ipv4.conf.default.accept_source_route = 0
 net.ipv4.conf.default.log_martians = 1
 
 net.ipv4.conf.all.arp_filter = 1
-net.ipv4.conf.all.rp_filter = 0
+net.ipv4.conf.all.rp_filter = 1
 net.ipv4.conf.all.accept_redirects = 0
 net.ipv4.conf.all.accept_source_route = 0
 net.ipv4.conf.all.log_martians = 1
 
 kernel.printk = 1 4 1 7
-vm.swappiness=0
 vm.mmap_min_addr = 4096
 vm.min_free_kbytes = 8192
 
 # Disable IPv6 by default.
 net.ipv6.conf.all.disable_ipv6 = 1
 net.ipv6.conf.default.disable_ipv6 = 1
+
+# Enable netfilter accounting
+net.netfilter.nf_conntrack_acct = 1
+
+# Disable netfilter on bridges.
+net.bridge.bridge-nf-call-ip6tables = 0
+net.bridge.bridge-nf-call-iptables = 0
+net.bridge.bridge-nf-call-arptables = 0
+
+# Restrict loading TTY line disciplines to CAP_SYS_MODULE to prevent unprivileged attackers
+# from loading vulnerable line disciplines with the TIOCSETD ioctl.
+dev.tty.ldisc_autoload = 0
+
+# Try to keep kernel address exposures out of various /proc files (kallsyms, modules, etc).
+kernel.kptr_restrict = 2
+
+# Avoid kernel memory address exposures via dmesg.
+kernel.dmesg_restrict = 1
+
+# Turn on hard- and symlink protection
+fs.protected_symlinks = 1
+fs.protected_hardlinks = 1
+
+# Don't allow writes to files and FIFOs that we don't own in world writable sticky
+# directories, unless they are owned by the owner of the directory.
+fs.protected_fifos = 2
+fs.protected_regular = 2
+
+# If a workload mostly uses anonymous memory and it hits this limit, the entire
+# working set is buffered for I/O, and any more write buffering would require
+# swapping, so it's time to throttle writes until I/O can catch up.  Workloads
+# that mostly use file mappings may be able to use even higher values.
+#
+# The generator of dirty data starts writeback at this percentage (system default
+# is 20%)
+vm.dirty_ratio = 10
+
+# Start background writeback (via writeback threads) at this percentage (system
+# default is 10%)
+vm.dirty_background_ratio = 3
+
+# The swappiness parameter controls the tendency of the kernel to move
+# processes out of physical memory and onto the swap disk.
+# 0 tells the kernel to avoid swapping processes out of physical memory
+# for as long as possible
+# 100 tells the kernel to aggressively swap processes out of physical memory
+# and move them to swap cache
+vm.swappiness = 1
+
+# Increase kernel buffer size maximums
+net.ipv4.tcp_mem = 16777216 16777216 16777216
+net.ipv4.tcp_rmem = 4096 87380 16777216
+net.ipv4.tcp_wmem = 4096 16384 16777216
+net.ipv4.udp_mem = 3145728 4194304 16777216
+
+# Prefer low latency over higher throughput
+net.ipv4.tcp_low_latency = 1
+
+# Reserve more socket space for the TCP window
+net.ipv4.tcp_adv_win_scale = 2
+
+# Enable TCP fast-open
+net.ipv4.tcp_fastopen = 3
+
+# Drop RST packets for sockets in TIME-WAIT state, as described in RFC 1337.
+# This protects against various TCP attacks, such as DoS against or injection
+# of arbitrary segments into prematurely closed connections.
+net.ipv4.tcp_rfc1337 = 1
+
+# Include PID in file names of generated core dumps
+kernel.core_uses_pid = 1
+
+# Block non-uid-0 profiling
+kernel.perf_event_paranoid = 3