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I am wondering when a packet reaches an interface and I have some PF rules, which gets checked first, the routing table or the ruleset?

ext_if = "em0"  
int_if = "em1" 
localnet = $int_if:network
VPN_if = 172.16.0.110

nat log on $ext_if from any to any -> ($ext_if)
rdr pass log on $ext_if proto tcp from !($ext_if) to any port 1:65000\
        -> $VPN_if port 2500
pass log from { lo0, $localnet } to any keep state
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1 Answer 1

up vote 4 down vote accepted

In FreeBSD the firewalls (IPF, IPFW, and PF) sit between the Device Driver and the IP Stack.
Routing is part of the IP Stack.

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so if i have a redirect rule in my PF ruleset that doesnt comply with the routing table, the PF rules wins? –  nawar Jan 2 at 12:54
    
PF Redirect just changes the destination IP of a packet, it doesn't route the packet. –  Chris S Jan 2 at 13:56
    
Thanks. So I have a BSD machine that runs NATing using PF. After de-nating, I want to force some packets to be routed to a machine in the LAN behind the NAT machine while not messing with the packet. Can PF help in achieving that? –  nawar Jan 2 at 14:33
    
I'm not following... Perhaps explain the situation surrounding this? –  Chris S Jan 2 at 15:21
    
I am developing a VPN app running on a BSD server (lets call it V) and mobile clients (M). The clients send packets with private IPs. I also have a NATing server using PF (N). M sends requests to V, which forwards the traffic to N, which then NATs and send the traffic to the internet. When N reverses the NATing, the packet's destination is private and doesn't belong to this LAN. I want to redirect this traffic using PF to V again to send the traffic to M through the established tunnel. Can redirection rules work here? I hope this clarifies the situation. Thanks! –  nawar Jan 2 at 15:53
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