sysctl.conf

#       $OpenBSD: sysctl.conf,v 1.52 2011/06/24 19:47:48 naddy Exp $
#
# This file contains a list of sysctl options the user wants set at
# boot time.  See sysctl(3) and sysctl(8) for more information on
# the many available variables.
#
net.inet.ip.forwarding=1       # 1=Permit forwarding (routing) of IPv4 packets
#net.inet.ip.mforwarding=1      # 1=Permit forwarding (routing) of IPv4 multicast packets
net.inet.ip.multipath=1        # 1=Enable IP multipath routing
net.inet.icmp.rediraccept=1    # 1=Accept ICMP redirects
#net.inet6.icmp6.rediraccept=1  # 1=Accept IPv6 ICMP redirects (for hosts)
#net.inet6.ip6.forwarding=1     # 1=Permit forwarding (routing) of IPv6 packets
#net.inet6.ip6.mforwarding=1    # 1=Permit forwarding (routing) of IPv6 multicast packets
#net.inet6.ip6.multipath=1      # 1=Enable IPv6 multipath routing
#net.inet6.ip6.accept_rtadv=1   # 1=Permit IPv6 autoconf (forwarding must be 0)
#net.inet.tcp.rfc1323=0         # 0=Disable TCP RFC1323 extensions (for if tcp is slow)
#net.inet.tcp.rfc3390=0         # 0=Disable RFC3390 for TCP window increasing
#net.inet.esp.enable=0          # 0=Disable the ESP IPsec protocol
#net.inet.ah.enable=0           # 0=Disable the AH IPsec protocol
#net.inet.esp.udpencap=0        # 0=Disable ESP-in-UDP encapsulation
#net.inet.ipcomp.enable=1       # 1=Enable the IPCOMP protocol
#net.inet.etherip.allow=1       # 1=Enable the Ethernet-over-IP protocol
#net.inet.tcp.ecn=1             # 1=Enable the TCP ECN extension
#net.inet.carp.preempt=1        # 1=Enable carp(4) preemption
#net.inet.carp.log=3            # log level of carp(4) info, default 2
#ddb.panic=0                    # 0=Do not drop into ddb on a kernel panic
#ddb.console=1                  # 1=Permit entry of ddb from the console
#fs.posix.setuid=0              # 0=Traditional BSD chown() semantics
#vm.swapencrypt.enable=0        # 0=Do not encrypt pages that go to swap
#vfs.nfs.iothreads=4            # Number of nfsio kernel threads
#net.inet.ip.mtudisc=0          # 0=Disable tcp mtu discovery
#kern.usercrypto=1              # 1=Enable userland use of /dev/crypto
#kern.userasymcrypto=1          # 1=Permit userland to do asymmetric crypto
#kern.splassert=2               # 2=Enable with verbose error messages
#kern.nosuidcoredump=2          # 2=Put suid coredumps in /var/crash
#kern.watchdog.period=32        # >0=Enable hardware watchdog(4) timer if available
#kern.watchdog.auto=0           # 0=Disable automatic watchdog(4) retriggering
#kern.pool_debug=0              # 0=Disable pool corruption checks (faster)
#hw.allowpowerdown=0            # 0=Disable power button shutdown
machdep.allowaperture=2         # See xf86(4)
#machdep.apmhalt=1              # 1=powerdown hack, try if halt -p doesn't work
#machdep.kbdreset=1             # permit console CTRL-ALT-DEL to do a nice halt
#machdep.lidsuspend=1           # laptop lid closes cause a suspend
#machdep.userldt=1              # allow userland programs to play with ldt,
                                # required by some ports
#kern.emul.aout=1               # enable running dynamic OpenBSD a.out bins
#kern.emul.linux=1              # enable running Linux binaries