SirJorj's Web Site

OpenBSD as a Router

NOTE: this was done with OpenBSD 4.5

Configure DHCP Server

DHCP Settings (/etc/dhcpd.conf)

shared-network LOCAL-NET {
  option  domain-name "my.domain";
  option  domain-name-servers 192.168.1.3, 192.168.1.5;

  subnet 192.168.1.0 netmask 255.255.255.0 {
  option routers 192.168.1.1;

  range 192.168.1.32 192.168.1.127;

  host static-client {
    hardware ethernet 22:33:44:55:66:77;
    fixed-address 192.168.1.200;
  }
}

Start dhcpd (where sis1 is the interface)
- Immediate:
  # /usr/sbin/dhcpd sis1
- On boot: (/etc/rc.conf.local)
  dhcpd_flags="sis1"
Logs
- Startup errors will be shown here
  /var/log/messages
- Leases
  /var/db/dhcpd.leases

Configure PF

/etc/pf.conf
#pf config data here

Enable IP Forwarding

Immediate:
# sysctl -w net.inet.ip.forwarding=1

On boot: (/etc/sysctl.conf)

net.inet.ip.forwarding=1        # 1=Permit forwarding (routing) of IPv4 packets

Enable PF
# pfctl -e
Disable PF
# pfctl -d
Load the pf.conf file
# pfctl -f /etc/pf.conf
Run pf on startup - add the following to /etc/rc.conf.local
pf=YES

Other Useful Commands

Reload network settings (without rebooting)
# sh /etc/netstart