ipfw

I noticed that on my public ssh server at port 22, I see a large number of ssh ESTABLISHED connections, that do not authenticate and stay in the ETABLISHED state sending keep alives. Specifically, in the nestat I see many entries of the form: tcp4 12 0 myIP:.22 156.0.96.22.52574...

Reading the ipfw man page, at the beginning, it states the following syntax for adding elements to tables: LOOKUP TABLES ... ipfw [set N] table name add table-key [value] ipfw [set N] table name add [table-key value ...] ipfw [set N] table name atomic add [table-key value ...] ... I...

Folks, I finally managet to sketch a little draft about some of my doings with ipfw: Advanced ipfw configurations (tell me if you find errors)

Hello. I'm trying to run an IRC server on my machine at home. The problem is that I'm behind my ISP's CGNAT, so I'm trying to connect this home machine(A) to a remote machine(B) that has public IP using WireGuard. On server A I wrote the following WireGuard config: #...

Hi, do you know ipfw syntax for pf dup-to command? Thanks in advance

Hello everyone, I would like to know if anyone knows the syntax of ipfw for reply-to and dup-to of pf and if you could write me some examples. Thanks in advance

Hello Forum, I am conducting tests on a L7 filter setup using BPF, IPFW, and TAG, based on the resource: Tutorial_NETGRAPH_A4_Slides.pdf. I am particularly interested in the section "BPF + IPFW + TAG = L7 Filter". During experiments on my FreeBSD system, I encountered an issue where packets do...

Hello everyone, I would like to use pf and ipfw at the same time for different tasks, but I can not understand who is activated first (if there is an order) when a rule is received. Also trying to verify this, I can’t figure out where the pf and ipfw log files are located on both OPNsense and...

I want to rate limit all outgoing traffic. I'm able to do so by following these steps Add the following line to /boot/loader.conf: dummynet_load="YES" Add the following lines to /etc/rc.conf: firewall_enable="YES" firewall_script="/etc/ipfw.rules" The /etc/ipfw.rules file looks like this...

I'm experimenting with ipfw packet tagging (tag/untag/tagged keywords) and keep getting unexpected results in seemingly trivial cases. The configuration for this experiment is: # ipfw show 00100 0 0 allow ip from any to any via lo0 00200 0 0 count tag 3 in recv igb0 dst-ip 192.168.33.1 not...

I've run a simple experiment on FreeBSD 14.0 and the results are quite unexpected to me. Could you explain these results to me? Warning! The experiment MUST be run from console. Do not try to reproduce it over SSH as it will make the host inaccessible! Console log, with comments: # killall...

Hi there, I am trying to solve a problem with my gateway setup. My FreeBSD machine is basically a gateway RaspberryPI which has two NIC: ue0 (Connected to external network, let's call it Internet) and ue1 (is an interface for internal LAN, dhcpd and dnsmasq spinning on it). My current setup...

Hello, My objective is to protect services on a bhyve host, while allowing traffic to the bhyve guests to pass to them unprocessed, as these each have pf and their own firewall policies. The host running an up-to-date 13-stable. I know ipfw can process both layer 2 and layer 3 traffic, but pf...

Hello Since I upgraded my FreeBSD from 12.0 to 13.2, I have problems with ipfw. For example, if I send a http request from my laptop (192.168.11.7) to the printer (10.50.0.22), ipfw blocks the response from the printer: Oct 5 10:34:08 mail kernel: ipfw: 2199 Deny TCP 10.50.0.22 192.168.11.7...

I expected that if I log on a stateful firewall with a typical dynamic rule to allow ssh setup like: ipfw add 4000 skipto 9000 log logamount 0 tcp from any to $oip ssh in recv $oif setup keep-state that the setup match would be logged, the dynamic rule would be created, and I would see one log...

ipfw pipe 1 config bw 10Mbits/s delay 20ms ipfw sched 1 config pipe 1 type fq_pie ipfw queue 1 config sched 1" ipfw add 100 queue 1 ip from 172.16.0.0/16 to 172.16.0.0/16 I put these commands in my router which contains FreeBSD 13.1. My client and server is FreeBSD 13.1. I just used iperf3 to...

I just did a fresh install of FreeBSD 13.1 with ionos.com cloud host. I cannot seem to ssh into the server at all, and it's driving me nuts (I've called ionos support probably 8 times today and they're stumped too). Here's what I have so far... - I can access my server via KVM console - Here is...

Hello all, is there a way to get some kind of failover working with two hosts running the ipfw firewall? From what I have read there is no such thing as pfsync for ipfw (so states would be lost at failover). But is there still another way to achieve failover with ipfw? As I also want to use...

Is there a way to block WebSocket traffic on IPFW without blocking https traffic with the same destination and port? How to distinguish websockets from https?

Hi there, I would like to know if you guys have heard or read a book that is talking about IPFW ? I know there is at least one about PF (Book of PF - a no-nonsense guide to the openbsd firewall), but I can't find anything IPFW related so I wonder if someone can enlighten me on this. Thank you.