Building the Network You Need with OpenBSD's PF: BSDCan, Ottawa May 6th, 2009
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# Simple gateway (with NAT if you need to)

Enable gatewaying

For IPv4: `#` `sysctl net.inet.ip.forwarding=1`

For IPv6: `#` `sysctl net.inet6.ip6.forwarding=1`

Make permanent, `/etc/sysctl.conf`

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

On FreeBSD, `/etc/rc.conf`

    gateway_enable="YES" #for ipv4
    ipv6_gateway_enable="YES" #for ipv6