similar to: ipfw "bug" - recv any = not recv any

Hi. On my FreeBSD 4.8 configured IPFW2+IPF+IPNAT and I use them all: - IPFW - traffic accounting, shaping, balancing and filtering; - IPFilter - policy routing; - IPNAT - masquerading. I want to know, how IP-packets flow through all of this components? What's the path? incoming: IPFW Layer2 -> IPFW&Dummynet -> IPNAT -> IPFilter ? outgoing: IPFW Layer2 ->

Hi, I'm using kernel FreeBSD 10.0-BETA3 #2 r257635 kernel. I am trying to add port number to ipfw tables. But there is something strange : Problem is easily repeatable. #ipfw table 1 flush #ipfw table 1 add 4899 #ipfw table 1 list ::/0 0 #ipfw table 1 flush #ipfw table 1 add 10.2.3.01 ( not 10.0.0.1, the last 1 has 0 as prefix ) #ipfw table 1 list ::/0 0 #ipfw table 1 delete ::/0

Hi, I have a system with a 4.11 Kernel. Unless I'm doing something very wrong, there seems to be something odd with ipfw. Take the following rules: ipfw add 00280 allow tcp from any to any 22 out via bge0 setup keep- state ipfw add 00299 deny log all from any to any out via bge0 ipfw add 0430 allow log tcp from any to me 22 in via bge0 setup limit src-addr 2 ipfw add 00499 deny log

-- On Friday, November 21, 2003 12:48 PM -0800 "David Wolfskill - david@catwhisker.org" <+freebsd-security+openmacnews+0459602105.david#catwhisker.org@spamgourmet.com> wrote: David, thanks for your reply! >> i've been struggling with setting appropriate rules for an SMTP-server >> behind by NAT'd firewall. > > OK.... <snip> > >>

Hi, Is it possible to integrate SNORT with IPFW. I have an entire network behind an IPFW BRIDGE. Just need IDS capability enabled for the network. Just an hint is enough. Any other way I can achieve this in IPFW. -Sunil Sunder Raj

Hi all: Did any one use ipfw with CARP before? is there anything specific about ipfw configurations working with CARP? I have two servers and they configured with CARP. they are working fine except i can't turn on ipfw. I have the exact same configuration except ip addresses; those same rule sets of ipfw work on one server but not on another. Thanks all

Hi, Two quick questions that I can't seem to find answers for using google. 1) is is possible to listen outside an ipfw firewall - that is have ethereal record the packets before ipfw starts dropping them? If so how? 2) Is there an api to ipfw that will let me manipulate rules, query stats etc? I need something faster than running the command line binary? Thanks John

>> 3. I'm intrested in blocking kazaa/P2P trafic with IPFW any help in this issue you could possibly block connections at known p2p ports. deny tcp from any to any 6699 step but most of the newer protocols use dynamic ports and in turn, are configurable. so ipfw isn't exactly ideal on it's own for this. -r. -----Original Message----- From: Pons [mailto:pons@gmx.li] Sent:

Hi all: I have strange probelm with rc.conf. I set up ipfw (compiled into kernel) on freebsd-5.4 and it doesn't seem to load ipfw rulesets (it uses default ruleset 65335 locking out everything). I have to do "sh /etc/ipfw.rules" in order to load the rulesets, once I did that, I can access the box from remote locations here is my rc.conf: host# more /etc/rc.conf

Ok, I am really stumped on this one. I setup ipfw with all my rules. Everything works great except for dns. If I do nslookup I get -su-2.05b# nslookup yahoo.com Server: localhost.webspacesolutions.com Address: 127.0.0.1 *** localhost.webspacesolutions.com can't find yahoo.com: Non-existent host/domain This is what I have in my ipfw.rules add 00310 allow tcp from any to any 53 out via

Hello folks, I'm trying to set up a ruleset that limits every user to X tcp connections, since I have 300 active users on each server. I've been trying to work it out with the ipfw limit but I really don't know how effective it is. For example: ipfw -q add 15 allow tcp from me to any 80 limit dst-port X keep-state out setup Will this limit the whole machine to X

Hi, I am using IPFW on FreeBSD 4.11 I am facing two problems: - SSH sessions timeout after a while - When I run "/sbin/ipfw -q -f flush" in the rules script all connection get reset (and I am thrown out of the box). Is this standard functioning of ipfw or do I need to change any configuration? Thanks, Siddhartha

Dear All. I want to use 'not' for 2 addresses (for both) in ipfw2 rule. The only way that looks like what I need is # ipfw add count from IP1 to not IP2,IP3 But does this rule indeed makes what I want? Does it count all packets destined to addresses other then IP2 AND IP3?! No other syntax works. For example more logically correct not IP2 AND not IP3 or even not { IP2 or IP3 } are

Hi There, I've been having an issue trying to figure out a way to policy route outbound packets from a multihomed machine through the proper interface using IPFW to no avail. I've tried several different incantations of IPFW fwd/forward statements, and none of them seem to do the trick. Basically, I have a host that has multiple Internet connections. This host is running FreeBSD 4.9

Dear W.D. Do you understand that by adding the rules into kernel space numbered from zero to sixty five thousand five hundred thirty four you may alter the behavior of the rule number sixty five thousand five hundred thirty five can you please define and list the goals you are trying to achieve by altering default rule in the terms you can both explain and understand. ----- Original Message

This note is essentially a request for a reality check. I use IPFW & natd on the box that provides the interface between my home networks and the Internet; the connection is (static) residential DSL. I configured IPFW to accept & log all SSH "setup" requests, and use natd to forward such requests to an internal machine that only accepts public key authentication; that

I'm not a master of the internet RFCs, but I do believe icmp messages have different types. Now to enable traceroute for IPFW, I might put in a rule like this: ipfw add pass icmp from any to me However, how would I make a rule to limit icmp messages to just those used by traceroute? Can the messages be distinguished as such? A dynamic rule that exists only for the duration of a traceroute

Hello, I've found myself in a situation where a simple data inspection capability added to ipfw would be very useful. I'm not thinking about anything especially sophisticated, but what about adding an option to check byte values (or flags, similar to tcpdump)? An example rule could be: add deny udp from any to me 12345 udp[4]&234 being the rule true if byte 4 in the UDP

Hi, I think this is worth a note. It was generally said the decision between deny and reject (aka unreach) could be taken lightly - and most people seem to prefer "deny", which complicates things for an attacker, because packets just vanish without any report and tasks timeout. But from my viewpoint, this argument falls into the category "security by obscurity", and I found

Dear all I need to do the following I have a fbsd router that runs nat and routes some public IP addresses I ned to use the ipfw rules to deny traffic from the public IP's AND the nat o do bandwidth limiting eg deny tcp from 192.168.200.1 to www.yahoo.com http out and deny tcp from 24.199.213.1 to www.yahoo.com http out my questions are where do I place the rules in relation to the