pf is the OpenBSD Packet Filter, a feature-rich IP-layer firewall used on FreeBSD, NetBSD, and Mac OS X, as well as in the pfSense open-source firewall appliance software.

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378 views

blocking packets for a non established connection on freebsd pf

For a freebsd pf firewall; I want it to block packets for non established connections. For example , the attacker should not send Reset packets for an unknown not-yet-established connection. In Linux ...
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1answer
2k views

OS X 10.8: redirecting locally initiated ssh connections to localhost:22

I need to hack the OS X pf to redirect all ssh connections from an user to this machine. I want, when doing $ ssh google.com to get the same results as with $ ssh localhost ie a connection to ...
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1answer
176 views

How to filter TCP packets based on flags using Packet Filter

Well, I didn't know exactly how to ask this question, but I know that you can use the keyword flags to especify which flags you want to filter. According to the documentation of the Packet filter: ...
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1answer
303 views

OpenBSD ftp-proxy behind NAT itself

Is it possible to change the PASV IP ftp-proxy of OpenBSD sends to clients, without changing the listen address of redirection control (-b <address>)? I have the following setup: FTP client ...
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1answer
1k views

pfSense to ASA L2L VPN - infrequent, short-lasting, but consistent disconnections

Has anyone here been able to specify a stable configuration for the L2L VPN between an ASA device and pfSense 2.0.1? I am using the most accomodating settings on the ASA side (DefaultL2LGroup with ...
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1answer
628 views

Reasonable rate limiting settings with PF firewall

I have the following settings in my pf.conf to dissuade abusive clients (I get a few a day that are obviously just scraping content indiscriminately and slow everything down): pass in on $ext_if ...
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1answer
156 views

Passing traffic to a service behind firewall

I am running nginx on port 8080, now I like to make it accessible from the internet, for that I open a port on my Router, next I add some rules to my PF, but a sniff from wireshark I see port ...
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2answers
3k views

Slow upload speeds with pfsense virtual appliance

I have a pfSense virtual appliance set up in front of a Windows server. The pfSense appliance has been configured with two L2L IPSec VPN sites and not too much else. The appliance has two vNics which ...
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1answer
503 views

Block Google requests to 16k using pf firewall

I'd like to block access to Google search using PF after the threshold of 17500 requests (connection established) in 24h, from a host running FreeBSD 9. What I came up with, after reading pf-faq is ...
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2answers
877 views

Route ssh traffic based on hostname using FreeBSD/pf?

I have a proxy/firewall machine running FreeBSD 9, using PF to route and filter traffic as needed. Now I'm setting up a git server, which runs over ssh, but I'm already using port 22 for ssh. I would ...
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2answers
2k views

Can I create a pf rule involving MAC address instead of IP?

The title is self explanatory. I want to create rules in pf running on OpenBSD 4.9 for perticular MAC address, something like pass in on eth0 from mac 00:04:34:5f:34:33 to mac 34:32:34:06:5e:22 I ...
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1answer
854 views

OpenBSD pf - implementing the equivalent of an iptables DNAT

Short version Server A (OpenBSD 4.7) connects to server B (Windows). IP of server B changes. Server A should be able to connect to server B to both the old and new IP. We cannot configure multiple ...
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1answer
3k views

Help me upgrade my pf.conf for OpenBSD 4.7

I'm planning on upgrading my OpenBSD to 4.7 (from 4.6) and as you may or may not know, they changed the syntax for pf.conf. This is the relevant portion from the upgrade guide: pf(4) NAT syntax ...
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2answers
5k views

Create a rule using shell in fresh pfSense installation to open up WAN access to WebConfigurator

I am in a situation where I require WAN access to be opened up to the WebConfigurator through pfSense because I do not have another node connected to the same network to access WebConfigurator from ...
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1answer
286 views

FreeBSD - monitor aggregate bandwidth of individual local network devices

I'm looking for ways to monitor the Internet usage - the total amount of data transferred - of individual devices on my network. I'm using FreeBSD 9.0-RELEASE with pf for filtering and NAT. I'm not ...
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1answer
4k views

OpenBSD 5.0 pf with NAT & Port Forwarding

Port forwarding does not seem to work properly, incoming connections apparently are blocked. Is there something wrong with my pf.conf? # Performance limits set limit states 200000 set limit ...
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1answer
570 views

OpenBsd 5 port forwarding

I'm trying to configure pf port forwarding on OpenBSD 5.0 The firewall machine has two nics: em0: 192.168.200.3 vic0: 192.65.214.136 I would like to forward all packets comming into ...
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2answers
275 views

How to configure something like “Reflexive ACL” on OpenBSD?

My U-Verse modem has something called "Reflexive ACL" described as Reflexive ACL: When IPv6 is enabled, you can enable Reflexive Access Control Lists to deny inbound IPv6 traffic unless this ...
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1answer
951 views

Order of application of NAT rules in pfSense 2

In pfSense 2.0, I have a bunch of WAN CARP Virtual IPs and a bunch of 1:1 NAT rules defined associating these IPs to LAN subnet hosts. If I set up Port Forwarding rules that forward from CARP IPs ...
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3answers
2k views

Port-Forward for all IPs on an interface

I'm running a java-based web server as a non-privileged user. Therefore it listens on ports 8080 and 8443 instead of 80 and 443. Right now I'm using the following pf rules to forward the ports ...
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2answers
798 views

Default values of pf.conf set parameters

I want to learn default values of these parameters, I read the manual of pf.conf but couldn't find, could you help? set limit states set limit src-nodes set timeout tcp.first set timeout ...
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2answers
2k views

Using Free/Open BSD + pf as a DDoS filter [duplicate]

Is using Free/Open BSD + pf a workable option for filtering DDoS? Which of the two would perform better under heavy load? (SYN flood maxing a 1 gbit pipe) Is this even an option to consider, or is a ...
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2answers
1k views

carp versus proxy arp

Currently I have a redundant pfSense firewall system set up for our corporate server farm. The main router IPs are sharing an IP address through Carp. Our two public /27 networks are assigned as ...
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1answer
1k views

Getting per-ip traffic stats from PF

Is there a way to get per-ip traffic stats from PF on OpenBSD 4.9? pfctl can give me the total traffic (bytes) for a given label, and pfstats for a given interface, and pftop can give me a "live" view ...
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1answer
1k views

OpenBSD pf port forwarding multiple rules

I have a few dozen servers behind OpenBSD firewall with port forwarding. Most rules are very similar and differ only in IPs or sometimes in ports forwarded, so I want to compact them to remove ...
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2answers
65 views

Keep connection state with target machine in PF when reply comes from a different IP

I'm facing a challenge with my PF firewall on an OpenBSD machine. From a client (A) I'm connecting to a server (B) using a target ip (SRV-IP-1). The server is replying to my request, but sourcing the ...
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2answers
448 views

using “include” like statement in pf.conf to include some parts from other files

I want to be able to include some parts of my pf.conf from other set of files. For example I will include "set timeout" vs like statements in another file. Using anchors and "load anchor from ...
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1answer
501 views

Disable ALTQ for internal network traffic

I currently have a FreeBSD 8.2 media server set up on my LAN that I use to stream my music from. I also have an SSH login that I use to do file transfers to and from this server remotely. I would ...
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1answer
1k views

How to check pf's queues?

I use FreeBSD and working with pf+ALTQ now. Something doesn't work and I need a tool to view what requests are marked and moved to a queue "queue_name" Need something like pftop but showing queues. ...
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2answers
3k views

PF rules and configuration to allow a local IP alias to NAT on FreeBSD?

Here's exact details of my configuration: Firewall/DNS Server: 192.168.2.1 (local lan) which routes out to the internet. <-- NOT UNDER MY CONTROL My FreeBSD Server: 192.168.2.23 (LAN) "Inside" ...
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1answer
104 views

blocking packets larger then specific size with pf

Is there a way with pf to block specific type of packets larger than specific size?
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1answer
275 views

PF firewall rules help

I'm having a heck of a time creating a pf ruleset for FTP. What I'm trying to do is : Only allow $WHITELIST to connect to FTP port 21 Open ports 49152 - 65535 for Passive port range Can anyone ...
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1answer
894 views

mDNS on bridged OpenVPN network

I have openvpn running on a openbsd server that is behind a firewall, so it is a local member of the LAN. The openvpn is a bridge configuration. firewall internal 10.0.10.1 openvpn server ...
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1answer
1k views

Provide IPv6 to network from OpenBSD firewall

I have an OpenBSD PF firewall that I have added a IPv6 tunnel to (using HE.net tunnelbroker). I can ping/traceroute IPv6 addresses from the firewall. Now I want to provide IPv6 services to the ...
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1answer
269 views

FreeBSD machine not responding to first few packets of a stream

I have two machines running as reverse proxy caches/load balancers in front of a site I admin. Recently at peak times I've been seeing a problem where the first few packets from any stream of packets ...
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1answer
2k views

Using NTPD on OpenBSD to get time from Linux using portforwarding

This is a rehash of another question, now that I understand things a bit better. I have the following network set up: NTP 10.21.3.169 | \______________ | \ ...
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1answer
1k views

A jail that is accessible from network without port forwarding

I am using FreeBSD 7.1 and on my server I have two different jails. One for database and second one for game server. What I need to know is if it is possible to assign game server's jail to public IP ...
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2answers
2k views

PF firewall issues with FTP inside FreeBSD jail

I have recently tried to set up jails on one of my FreeBSD servers, and I’m running into strange errors while trying to download FreeBSD packages via FTP. I have these rules in the PF firewall to ...
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1answer
433 views

Inaccurate bandwidth limiting in altq queues

I'm setting up an environment where I have one Linux server, one OpenBSD router and one Linux client and I want to be able to limit how much bandwidth the client should be able to use. I've been ...
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3answers
1k views

Does PF support divert like IPFW?

I'm currently using IPFW on 3 dedicated firewall servers, and I would like to convert them to PF for some of its functionalities, but I need divert to work. Specifically I am teeing packets to a ...
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2answers
2k views

FreeBSD+PF+Passive Firewall=Frustration

I have a FreeBSD server that I'm trying to get FTP working on. If I disable pf everything works great. If I connect while pf is running I can login successfully-but as soon as I run an ls I get this: ...
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1answer
972 views

pf port forwarding

I've got the basics of my pf firewall/NAT router setup working; traffic going out fine, DNS requests on port 53 mapped into an internal subnet and back out again successfully (no change in port ...
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2answers
2k views

FreeBSD nat via PF: how to change from random UDP ports to incremental?

I'm testing NAT penetration code and need a symmetric NAT. I have configured FreeBSD with PF, very simple rule: # rl0 in WAN on DHCP, sk0 is LAN with computers behind this NAT. nat on rl0 from ...
2
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1answer
980 views

Creating pflog interface

I'm attempting to create a pflog interface using ifconfig so I can log to more than one file and when I attempt to execute the following command I get this error. I'm attempting this on a vanilla ...
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1answer
127 views

PF tagging then adding to table

could someone please provide an example on how to add a tagged packet to a table? I have found commands to do it from the command line but can you setup a specific rule to do it inside of pf.conf? ...
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2answers
371 views

Packet Filter configuration to restrict traffic to the local host

I have been running a pf based filtering router on OpenBSD 4.3 for about a year now. My current task is to set up a new network segment for hosting our external sites. My aim is that machines set up ...
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7answers
2k views

reroute DDOS to FBI Illegal? [closed]

Okay I know this might sound silly or dumb, but I would like to know (if anyone knows) if it would be illegal to reroute DDoS traffic to fbi.gov... I just thought it might be a good idea if you ...
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3answers
3k views

NFS mount “hanging” when accessing from a server on a different subnet

Here's a problem which I am at a loss to diagnose: Our user home directories are served via NFS from an Apple XServe running Mac OS X 10.5.7. Normally they are exported to our default office subnet, ...