It blocks the source IP address. The red X under the source IP column indicates that the IP address was sent to the firewall for blocking. This IP address should be listed on the BLOCKS tab and also appears in the snort2c pf table under DIAGNOSTICS > TABLES. If your firewall hardware (network adapters and their drivers) supports the netmap kernel device, you can switch to online IPS mode and use the MGMT SID tab to change your P2P rules to DROP. Online IPS mode does not use a success list because it does not block all traffic to or from an IP address, but only removes individual packets that match the rule. I snort_p2p and openappid_p2p_file_sharing, went in and made sure bittorrents are explicitly not allowed, and there are notifications and blocks them, but the traffic is still downloading. These few specific rules should give you an idea of the scope and flexibility of P2P clients to navigate your network. More clients and networks are available to your users. There are several options that can help you detect and repel these apps. Then it means that the P2P rules you use aren`t enough to stop all the torrenting stuff. It intercepts some of the conversation between the client and the peer, but not everything, so the client is still able to connect and download. This is not a problem with Snort himself. Instead, it`s a problem with the rule or rules that try to detect traffic.
The rules obviously do not take everything. I set up Snort on my main machine to block p2p and I also see p2p events on it. Traffic that my mainsense test computer cannot block. I have Snort in legacy blocking mode, but I can download torrents. Gnutella is another popular file sharing app. This application, like Kazaa, has a default port (6346/tcp) that opens on the client computer, as well as the port used to communicate with the Gnutella network. The following rule is triggered when the client communicates over your network. This rule comes from the official rules of Snort, number 557.
Hello thanks for the sniffing rule. Yes, my test machine can catch it. So this proves that Snort works and that I have no other way to use the Internet. I see deletion notifications in the Alert tab and I can`t ping (request timeout). If you have rules that trigger and display drops on the ALERTS tab, this should interrupt torrents. If not, he yells at me that traffic has a different way of the Internet. Maybe your pfSense box really only sees data traffic by the way, since the IDS puts the LAN interface in promiscuous mode by default. This means that all traffic on the line is displayed, including traffic that is not destined for the firewall. For OpenAppID rules, you must also enable the OpenAppID preprocessor in the PREPROCESSORS tab of the interface. Have you done that? And did you restart Snort on the UI after making this change? Sniff Rules and Mailing Lists (www.snort.org) Blocking such things is a mole game. Developers of torrent clients try not to distinguish their traffic from regular network traffic (and therefore not to block it). And IDS/IPS rule creators are working to create new detection rules that trigger on the latest circumvention techniques – and that`s what it`s all about.
Hi, I set up snort and enabled all rules in the following rule categories, I tested the Untangle router and it seems to be able to stop my torrents. It has a function called tarpit. I wish Snort could do that. snort_pua-p2p.rules snort_pua-p2p.so.rules emerging-p2p.rules openappid-p2p_file_sharing.rules PUA rules are really designed to detect the presence of the target application and not necessarily block it completely. You may need other rules to block traffic completely. Try a Google search to “block p2p with snort” to get links. I found a few. Some are old, but others are newer. Here`s a more recent one: www.researchgate.net/publication/334213518_Interception_of_P2P_Traffic_in_a_Campus_Network. Hi, so now I only have a Snort configuration on the local network and have enabled all P2P rules. On the RULES tab, click Apply to send the rule change to Snort.
Wait a few seconds for Snort to reload the rules and process the change. The Kazaa network is actually a mini HTTP protocol for sending files and browsing other users` shared files. The client is configured to communicate over port 1214/tcp. The following rule detects outbound connections on the Kazaa port: So you configured NICs as relay hardware in KVM? If you have three NICs, how do you do that with two firewall VMs? Each firewall VM requires at least two NICs (one for the LAN and one for the WAN network). Next, you need to get traffic to the Ubuntu server, so does it have a fourth NIC to work with? I really believe you have traffic that bypasses the firewall, and Snort only sees traffic because promiscuous mode is enabled. One method of detecting BitTorrent is to track when it is installed on a client computer. The following rule detects when a user downloads the Windows version of the BitTorrent client: Yes, I see a lot of P2P alerts in the Alerts tab. And in the blocked tab and I enabled OpenAppID on the preprocessor tab for all interfaces. My main router LAN=192.168.1.0/24 Test machine=10.1.1.0/24 Thus, the above warning means that the IP address 222.32.xx.xx (regardless of the full value) is blocked and can no longer be contacted by clients on your network. However, with P2P traffic, there are literally dozens of alternative IP addresses that your customer can contact (hence the name peer-to-peer).
Each of these remote hosts is in turn blocked. But your local customer won`t, so they can keep trying each of these dozens of potential peers. So that this conversation is blocked. Literally, when the packet entered the firewall`s LAN interface, it was rejected by Snort in such a way that the destination IP (the Internet peer) never saw that packet. Now, the client will immediately try to find another peer, but Snort should also identify it and let it down. When I power on the pfsense virtual machine on my test machine, these PCI Express NICs are no longer provisioned on the host. The NICs are connected directly to the virtual machine. The Ubuntu server does not get internet from these network adapters. It doesn`t make sense to me. Are you saying that Ubuntu server has no network connection? They said there were 3 NICs. What is everyone connected to? For example, your pfSense test machine needs at least two to run, so where does the third go? This rule removes ICMP traffic to the dslreports.com domain.
You can select and replace any other address. Just make sure it`s a website that usually responds to ping requests. Now, what other modes your client can switch to, I`m not sure because I don`t know the client. But many of them, if hampered by traditional P2P connection attempts, will switch to “firewall bypass modes,” such as using SSL on port 443. Are you sure your customer doesn`t? Snort will not necessarily capture this type of traffic. Yes, 10.1.1.12 is the IP address of my local machine. The other is a P2P peer. I use Transmission 2.94 as my p2p client. I am 100% sure that I am only connected through this interface. My Wi-Fi is turned off and connected via Ethernet. It certainly sounds like your description that you have another way for the customer to reach the web. Capture packets on the WAN of the pfSense box of the test machine and see if your torrent traffic appears there.
Click Save to save the rule and return to the RULES tab. In terms of traffic bypassing the firewall, how would pfsense confirm? Is there an attitude I can pay attention to? My Ubuntu server does not see the NICs because they are connected directly to the virtual machine (PCI relay) client PC –> pfSense test computer -> main pfSense -> Internet A characteristic of all P2P users on a network is that they have many connections inside and outside your network. Therefore, network usage metering plays an important role in detection, especially on large networks. Okay, if you see the warnings and legacy mode blocking is enabled and you have enabled the end of status option for blocked IP addresses, the only reason is that the offending IP addresses are not blocked if they are in the default success list. The default access list includes all locally connected firewall networks (except the WAN), the firewall`s configured DNS servers, the default gateway, and all individual firewall interface IP addresses (including the public WAN IP address). But how are things really connected? You should have this for Snort to block properly – there`s a sticky post at the top of this subforum describing the online IPS mode. The 19 alerts on the Alert tab are drops for P2P activity Is there anything I can do to block torrents? Here`s the screenshot I removed the end of each IP address How can I detect when users on my networks are using peer-to-peer (P2P) applications, potentially putting our company on the RIAA`s radar for investigation? Client PC –> pfSense LAN –> pfSense internals –> pfSense WAN –> Internet To be honest, what you describe doesn`t seem plausible with online IPS mode. If packets are dropped on the ALERTS tab and the IP address displayed for the deletion rule matches the workstation on which you are running a torrent client, that client should not be downloaded correctly.