FreeBSD as Router/Firewall

# install same  commonly used
pkg install vim bash sudo htop tree xauth wget curl nmap git cpuid pftop bind-tools sysutils/bsdinfo vnstat

# OpenBSD Packet Filter (PF) & ALTQ
kldload pf.ko
service pf enable
service pflog enable
service pfsync enable

hostname="freebsd14"

# set wan
ifconfig_vtnet0="inet 10.21.0.254/24"
ifconfig_vtnet0_alias0="inet 192.168.31.1/24"
defaultrouter=10.21.0.1
gateway_enable="YES"

ifconfig_vtnet1="inet 10.20.0.254/24"

# set bridge lan
#cloned_interfaces="bridge0"
#ifconfig_bridge0="addm vtnet1 vtnet2"
#ifconfig_vtnet1="up"
#ifconfig_bridge0="inet 10.20.0.254/24"

sshd_enable="YES"
netwait_enable="YES"
netwait_if="vtnet0"

# routing
static_routes="asus"
route_asus="192.168.33.0/24 192.168.33.1"

#################################
#### Packet Firewall Ruleset ####
#################################

###################
#### Variables ####
###################

# External interface
ext_if="vtnet0"

# Internal interface
int_if="vtnet1"

# Follow RFC1918 and don't route to non-routable IPs
# http://www.iana.org/assignments/ipv4-address-space
# http://rfc.net/rfc1918.html
nonroute= "{ 0.0.0.0/8, 20.20.20.0/24, 127.0.0.0/8, 169.254.0.0/16,
        172.16.0.0/12, 192.0.2.0/24, 192.168.0.0/16, 224.0.0.0/3,
        255.255.255.255 }"

# Set allowed ICMP types
# Blocking ICMP entirely is bad practice and will break things,
# FreeBSD applies rate limiting by default to mitigate attacks.
icmp_types = "{ 0, 3, 4, 8, 11, 12 }"

####################################
#### Options and optimizations #####
####################################

# Set interface for logging (statistics)
set loginterface $ext_if

# Drop states as fast as possible without having excessively low timeouts
set optimization aggressive

# Block policy, either silently drop packets or tell sender that request is blocked
set block-policy return

# Don't bother to process (filter) following interfaces such as loopback:
set skip on lo0

# Scrub traffic
# Add special exception for game consoles such as PS3 and PS4 (NAT type 2 vs 3)
# scrub from CHANGEME to any no-df random-id fragment reassemble
scrub on $ext_if all no-df fragment reassemble

#######################
#### NAT & Proxies ####
#######################

# Enable NAT and tell pf not to change ports if needed
# Add special exception for game consoles such as PS3 and PS4 (NAT type 2 vs 3)
# ie static-port mapping. Do NOT enable both rules.
# nat on $ext_if from $int_if:network to any -> ($ext_if) static-port
nat on $ext_if from $int_if:network to any -> ($ext_if)

# Redirect ftp connections to ftp-proxy
rdr pass on $int_if inet proto tcp from $int_if:network to any port 21 -> 127.0.0.1 port 8021

# Enable ftp-proxy (active connections)
# nat-anchor "ftp-proxy/*"
# rdr-anchor "ftp-proxy/*"

# Enable UPnP (requires miniupnpd, game consoles needs this)
# rdr-anchor "miniupnpd"

# Anchors needs to be set after nat/rdr-anchor
# Same as above regarding miniupnpd
# anchor "ftp-proxy/*"
# anchor "miniupnpd"

################################
#### Rules inbound (int_if) ####
################################

# Pass on everything incl multicast
pass in log quick on $int_if from any to 239.0.0.0/8
pass in log quick on $int_if inet all keep state

#################################
#### Rules outbound (int_if) ####
#################################

# Pass on everything incl multicast
pass out quick on $int_if from any to 239.0.0.0/8
pass out quick on $int_if inet all keep state

################################
#### Rules inbound (ext_if) ####
################################

# Drop packets from non-routable addresses immediately
block drop in quick on $ext_if from $nonroute to any

# Allow DHCP
pass in quick on $ext_if inet proto udp to ($ext_if) port { 67, 68 }

# Allow SSH & HTTP
pass in quick on $ext_if inet proto tcp to ($ext_if) port { 22, 80, 443 }

# Allow ICMP
pass in quick on $ext_if inet proto icmp all icmp-type $icmp_types

# Allow FTPs to connect to the FTP-proxy
# pass in quick on $ext_if inet proto tcp to ($ext_if) port ftp-data user proxy

# Block everything else
block in on $ext_if all

#################################
#### Rules outbound (ext_if) ####
#################################

# Drop packets to non-routable addresses immediately, allow everything else
block drop out quick on $ext_if from any to $nonroute
pass out on $ext_if all

# forwarding
net.inet.ip.forwarding=1
net.inet6.ip6.forwarding=1

# set autotuning maximum to at least 16MB too
net.inet.tcp.sendbuf_max=16777216
net.inet.tcp.recvbuf_max=16777216
net.inet.tcp.sendbuf_auto=1
net.inet.tcp.recvbuf_auto=1

kern.ipc.maxsockbuf=16777216
net.inet.tcp.sendbuf_inc=16384

# socket max connect
kern.ipc.somaxconn=4096

# delay
dev.em.0.rx_int_delay=66
dev.em.0.tx_int_delay=66

# ack delayed
net.inet.tcp.delayed_ack=1

net.isr.maxthreads=4
net.isr.bindthreads=0
net.inet.tcp.syncache.hashsize="2048"
net.inet.tcp.syncache.bucketlimit="128"

mkdir -p /var/db/vnstat/
chown -R vnstat:vnstat /var/db/vnstat
service vnstat enable
service vnstat start

kldload coretemp
echo 'coretemp_load="YES"' >> /boot/loader.conf
echo 'sysctl -a | grep temperature' > /usr/local/bin/sensors
chmod +x /usr/local/bin/sensors

# Configuration file for dnsmasq.
listen-address=127.0.0.1,10.20.0.254
dhcp-range=interface:vtnet1,10.20.0.100,10.20.0.200,48h
resolv-file=/etc/dnsmasq.d/resolv.dnsmasq.conf
# log-queries
log-facility=/var/log/dnsmasq/dnsmasq.log
log-async=100
conf-dir=/etc/dnsmasq.d
no-hosts
addn-hosts=/usr/local/etc/dnsmasq.d/dnsmasq.hosts

all-servers
server=10.20.0.1
server=114.114.114.114
server=/cn/114.114.114.114

address=/gw.example.net/10.20.0.254
address=/example.net/10.20.0.254
address=/www.example.net/10.20.0.254

dhcp-host=asus-pc,a4:39:b3:43:b0:d1,10.20.0.201,infinite

10.20.0.1 example.net

wget https://raw.githubusercontent.com/privacy-protection-tools/anti-AD/master/adblock-for-dnsmasq.conf -O /etc/dnsmasq.d/adblock-for-dnsmasq.conf