OpenBSD Routing With PF

OpenBSD Routing With PF

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OpenBSD Routing With PF

Running PF in the Firewall Mode
In order to turn this firewall into a router, you must create a new table that will act as a firewall. Since we cannot create and modify tables with the pfctl command, we will use pf.conf to do the job.
Create a new table (replace target_table with whatever you named your table) in /etc/pf.conf: # PF_TARGET_TABLE target_table { static (inside/outside).pf_destination_if { interface wan_if } address 10.pf_dest_subnet { (172.18.10.0/24) address 192.168.1.110 } }
This table will be used to filter the traffic to the VPN client’s external interface. It will be used as the main firewall table and will block traffic that does not match the source or destination addresses within the subnet designated by pf_dest_subnet.
Step by step instructions to turn your firewall into a router? Well, here’s the thing.
Enable pf_dest_netfilter logging
This is very useful for debugging rules.
Without logging, the only error messages you can get will be listed in the console.
With logging enabled, every packet that is allowed or denied goes through the network.
When you have a look at these logs, it will give you a quite clear picture of the problems you are facing.
Enable logging with the command pfctl -a filter target_table.
Turning Your firewall into a router
We now have our firewall working as a “router”.
First thing you’ll need to do is to have different subnets from both the router and the server, including the same security rules in pf.conf.
.pf_dest_subnet address 0.0.0.0/0
When writing rules, try to keep the number of different IPs as low as possible.
This will help you avoid rule conflicts.
Now it’s time to assign the IP to the WAN interface and to create some static routes.
The idea is to create a link-local route for each subnet.
Each of these routes will go through the WAN interface and be reachable from the VPN client.
First, let’s assign the WAN address to the interface:
# pfctl -f /etc/pf.conf
interface: wan_if
address

OpenBSD’s firewall, PF, is handy but one of its features is that it does not perform routing and is a .
OpenBSD’s firewall, PF, and routing. Juniper Networks’ IPSec VPNs. and up until OpenBSD 4.10 the firewall is configured using post-up and pre-down.PF_ROUTE,.
Aug 18, 2010 . and others: Server firewall (OPENBSD kernel) [Does not work in PF version 3/4.]. You may want to modify it according to your needs.
Yes, and there are a lot of pitfalls. This is a solution to the problem of why it is so easy to accidentally end up with a firewall somewhere between your host and your server that .We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them.

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There are three basic data flows when you talk about a packet. The first thing is determining what IP address the packet is being sent to. For the IPv4. either on OpenBSD’s pf/ipf or the ipsec setup or on FreeBSD’s iproute/netfilter.
you create a local table with the range of IP addresses you want to allow (ex. 192.168.1.1-192.168.1.10).. and dump them off on a machine you don’t care about, and then add the IP addresses you don’t want coming into this net to the route-to table.. A: Access Filtering Rules.
With a central firewall, not having to do this every time can save a lot of time. OpenBSD’s PF allows a very clean way of doing this. A picture is worth a thousand words, here are some instructions on how to set up PF to do some fancy filtering.
howto – howto / ipsec / bgp /  . Under the Route-to tab, you can set up the external IP address you want to filter. If you want to check both internal and external, you can set up separate tables for the two. You can even combine filtering on both internal and external interfaces,. to ipsec.
In this example, the 192.168.100.0/24 subnet is internal and the 10.0.0.0/8 network is. I want to allow all traffic from the internal network to the public internet, except. If you’re setting up multiple subnets with both internal and external IPs, you can do things like this:.
Take a new table for the internal network: # Generated by pfctl -t nat -c > “nat.rules” # ——————————————————–.
Why do you think you need to be doing this?. The default action is DROP and the rest are REJECT. If you want to do something else, instead of dropping the packet, you can either append them to a log or discard them.. # Set up the logging action. # -J LOG contains the log: # iov# iov[iovcnt++].iov_len = sizeof(label); # The “label” of the packet: # – If you’re sending this packet, it.
When you need to create a table that can put filtering rules in it, the syntax is either a rule with the following structure:

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