OpenBSD Routing With PF UPDATED

OpenBSD Routing With PF

if you like the routing based firewall, you can also add routing rules to the ifconfig.vr0.route file. the example below adds a rule to route traffic to the private lan on interface vr0 to the 10.10.0/24 class c network.

the trick is to add a routing section file to the pf.conf file. the example below will add routing rules to a file called hostname.rules on /var/routing/hostname.rules. this is a good way to add routing rules to your vpn tunnel, but you can also add them to other routing table entries using the -r flag.

you might be wondering why we’re using the interface being used by the ip forwarding process. there’s several reasons for this, i’ll go over them:

• this will allow us to have ipv4 addresses on the router as well as on the host. we will use them in the next step to create a virtual interface for our port forwarding. this interface will be used for the router ip address, so using the interface used by the ip forwarding process for this is a good idea.
• it will make sure that there’s no routing between the hosts and the router, so we don’t have to worry about that when we forward packets between hosts. this is important if you decide to use the postrouting statement in the following step.
• we will use it later on to create a virtual interface for the l3 forwarding, so the ip addresses used for this are important.

/etc/sysctl.conf

net.inet.ip.forwarding = 1

/etc/sysctl.forwarding = 1

the configuration file for the routing table is called route. please note that the route parameter is case sensitive and you have to use route instead of route.

in our default configuration, we only want the packet to go to the server ip (192.168.1.50) in case it is a destination host, else it will be dropped. if a packet comes from the same host in our client-side subnet but with a different destination ip, we want to forward it to the other server:
iptables -a output -o eth0 -p tcp –sport 58800 -j dnat –to-destination 192.168.1.50 iptables -a output -o eth0 -p tcp –dport 58800 -j dnat –to-destination 192.51 openbsd routing with pf from the perspective of our router, the ports are used as follows:
the first step is to install all the software and tools we’re going to need. we’re going to install the netfilter/iptables tools, we’re going to need the userland resolver tools in order to run our own recursive resolver, and we’re going to install the openbsd pf firewall tool. the resolver tools are optional, but i like to have them because the nslookup tool is really good at local dns lookups and we’re going to use it frequently to verify that the dns works as it should. the rest of the tools are optional, but they are very helpful and it’s useful to have all of them installed.
with this tutorial we’ll go over how to install ntop, a network information collection and monitoring tool, on openbsd. ntop is a very powerful tool that provides information on network usage, performance, network security, servers and services.
whether you are on a 2.4.x or 3.x openbsd kernel, you can install the nmap package from the nmap directory. with nmap you can check your network connectivity to servers and services, scan for hosts and ports, and perform many other tasks.
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