Many of our customers want reports which look for all outbound traffic on port 80/443 but where the traffic type isn’t HTTP/HTTPS. Don’t forget about virtual networks. There are a couple of ways you can check for Netflix traffic on your network after installing LANGuardian. These companies typically engaged  Akamai™  for content delivery. We look at what happens when a network is targeted and what you should watch out for on your own network. PirateBay is a website that provides magnet links (and some torrent files) to facilitate peer-to-peer file sharing using the BitTorrent protocol. Just SPAN or mirror the Internet link, connect the LANGuardian to the SPAN port and away you go. Watch out for things like network scans, traffic on unusual port numbers, TOR traffic. All of the following screenshots were taken using LANGuardian as a DDoS attack monitor on a real network. The problem with this approach is that it can be very time consuming, this is especially so if you are dealing with high traffic volumes. By throttling the page you can get a better idea of how long a page takes to load on a mobile device. As usual it amounted to a very interesting few days with visits to public sector clients, a document management company and even a F1 team. Flow analysis is great for getting a top level view of what is happening on a network. It has become very popular since been abruptly taken down by its original developers on March 14, 2014 due to pressure from the MPAA. switch(config-monitor)# destination interface ethernet 2/10 We can assume that the client was a member of a botnet and was issued commands to target this network. QUIC aims to be nearly equivalent to an independent TCP connection, but with much reduced latency. Typically a network device extracts certain information from the packet headers. It has been estimated there are over a hundred thousand abusable NTP servers with administrative functions incorrectly open to the general Internet. If you do, you need to check the systems on your network that are communicating with the IP addresses. This destination address is clearly part of a CDN, so resolving the IP address to a hostname provides no further insight and the network administrator is none the wiser as to the real origin of the downloaded data or why the user is downloading it. This monitoring tool is one of the most popular network monitoring software for enterprises, but it also has a free version. The price of SolarWinds Network Performance Monitor starts at $2,995 (£2,304). SolarWinds Network Performance Monitor is a top network monitoring system because of its diverse feature set. You can read more about amplification attacks here and here. Real-time monitoring and alerts for key routes and major works. ASA(config-if)# description Firewall Connection, ASA(config-if)# description Deep Packet Inspection Tool, ASA(config-if)# switchport monitor ethernet 0/0 both. Our head of development had the floor and was giving us an update on some recent modifications to our Bittorent decoder. In my case the network manager had a Cisco ASA 5505 deployed. To find out if LANGuardian is the right solution for your business, visit Microsoft Message Analyzer. If you would like to know more about Network Monitor and arrange a demo please contact us. Armed with the information LANGuardian provides, they can then work with their colleagues who manage desktop deployment to identify ways to roll out patches without using up all the capacity on a remote link. The ability to monitor network traffic in real-time is sufficient to achieve many objectives of network traffic monitoring, but sometimes real-time data is not enough. Trace, measure, and analyze network traffic and performance data all at once. NetFlow and other flow standards allow you to see what systems are connecting to what and how much data is been exchanged. The IDS in LANGuardian contains two signatures to detect Netflix on your network and they can be found under sid: 2007638 and 2013498 which are included below: alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:”POLICY Netflix On-demand User-Agent”; flow:to_server,established; content:”|0d 0a|User-Agent|3a| WmpHostInternetConnection”; nocase; reference:url,; classtype:policy-violation; sid:2007638; rev:5;), alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:”POLICY Netflix Streaming Player Access”; flow:to_server,established; uricontent:”/WiPlayer?movieid=”; content:”|0d 0a|Host|3a||0d 0a|”; nocase; reference:url,; classtype:policy-violation; sid:2013498; rev:2;). Looking though the results, I also need to check the activity on port 49158. The image below shows an example of the output. The problem with this is that while this is a view of what system is connecting to what, it is hard to read. IP addresses are recycled so it could be that you were allocated a dodgy one. You need to take a look inside the network packets and work out what application it is based on what the packet payload or content is. No need to install any agents or client software. In this blog post, I take a look at the most important points on a network which you should focus on. Users accessing media sites like Netflix and YouTube can consume massive amounts of bandwidth. Make sure you start off by monitoring the internal interfaces of firewalls, this will allow to track activity back to specific clients or users. It just means that some images may be missing when users are browsing the app. The release is scheduled for 12AM ET on July 29th (9PM PST on July 28th). Microsoft Network Monitor is a protocol analysis and network traffic monitor tool. Further, we can calculate that the average received NTP response packet size is about 440 bytes, significantly larger than a standard NTP response packet (about 90 bytes). We have further videos available within the resources section on this website which looks at what you need to do on other Hypervisors. However, if you want 24/7 traffic monitoring then you will need to look at a different solution. Client systems which upload a lot of data are sharing something and are always worth investigating. However, you will need to analyze traffic locally at the remote sites if you want to see what is happening on these remote networks. Most people set them up so that one port is mirroring another port. It is the same idea for Netflix, simply type in the website name and click on view. I do show some activity and I will need to do further analysis of the local client Once setup you should look for any clients connecting to systems outside your network on high port numbers. In today’s world, you cannot assume that all activity on port 80 or 443 is web page browsing. The most flexible option is a network traffic monitoring tool that is software-based and allows you to allocate whatever disk space you think is appropriate. NetFort provides network traffic and security monitoring software for virtual and physical networks. The good news is there is an effective, affordable solution for monitoring network activity – LANGuardian; LANGuardian enables Network Managers to use a SPAN (monitoring) port to monitor and report on network activities both internally (intranet servers and files shares) and externally (websites, cloud services and social media), Easy to use; LANGuardian’s “deep packet inspection” provides the highest level of visibility into activity on the network. Go to the website and enter this IP address in the top right hand corner. Our customer thought it was very interesting and useful for a network like his; especially as he is so heavily focused on security these days while helping and educating his customers. When monitoring internet traffic, tools that look at traffic volumes alone will not spot the problems. Active Directory integration allows you to associate Bittorrent activity with usernames too. Click on the image above to access this report directly on our live demo system and drill down. The most common use of QUIC today is for streaming YouTube videos. This video explains how you can use a SPAN port to monitor internet activity. It really got the security community going. Clicking the graph enables the network administrator to drill down into details of traffic over the link and see the source and destination addresses that caused the peak to occur. In the following example I used LANGuardian to extract certain information (metadata) from network traffic which shows Popcorn Time activity. Normally clients download a lot more data than they upload when accessing web pages. Most traffic on my network using port 80 is HTTP but I have a small amount of Bittorrent traffic using this port. You can download them and within minutes you can start to drill down and see what is actually moving around your network. E-mail:, © This flow information is then sent to a flow collector where its is processed and stored. /downloads/product-documentation/core-switch-documentation/. When links get busy, you can’t keep increasing the capacity. Deep packet inspection (DPI) tools like LANGuardian use packet capture to analyse the data which is moving around your network. GeoIP matching allows you to see the countries websites are located in. SPAN ports work by sending a copy of the traffic destined to one or more ports or VLANs to another port on the switch that has been connected to a network traffic analysis or security device. It may also be a very expensive option, so getting visibility as to what is happening on these links is vital. The destination IP is located inside this network. During my tests I had downloaded almost 1GB of data in just a few minutes.If you allow it. Mobile and broadband data caps alike have made people very conscientious of their data usage. We now live in the age of the Internet of things; everything is getting connected to the Internet, from washing machines to fridges. Drilling down on the HTTPS traffic, it revealed that the data was associated with the domain. Monitoring tools which look at packet payloads and identify what applications are riding on ports 80 or 443 are a more accurate solution. A recent article from the BBC also suggests that website-crippling cyber-attacks are to rise in 2016 – the organization itself having been taken offline by a massive DDoS attack at the end of last year. Click on this image to access the report on our online demo. Again we can see the activity on TCP port 445. Some flow technologies have moved towards sampled packet analysis. However, don’t forget about your cloud based networks. I saw over 1GB of downloads in less than 1 hour for a single client. Click on the image below to access this report on our online demo. The ‘monlist’ command returns multiple packets of this size in response to a single request. Users do not connect to IP addresses. Packet capture applications solve this problem as they look inside HTTP headers to extract information like client, proxy and website. Once a BitTorrent client has established a connection with another peer it can then download and upload data. Typically, the source address would correspond to a system on your network, while the destination address would correspond to an external host. Another feature of deep packet inspection tools is their ability to recognize applications based on packet payloads. Network Bandwidth Analyzer Pack. As well as productivity- and bandwidth-sapping activities, we also demonstrate how to conduct forensic analyses on historical events such as ransomware or DDoS attacks. Watching Netflix can use around 1 GB of data per hour for each stream when viewing in standard definition and up to 3 GB per hour for streaming content in high definition. Wireshark is very useful for troubleshooting issues associated with a single client. We have forged strategic partner relationships with leading consumer channel partners such as Google and TomTom. If you want to scale up from local packet capture, then you should look at options like SPAN ports or TAPs. QUIC detection was added to LANGuardian version 14.3.2. Comments welcome. Select Stop, and … Bandwidth capacity to remote networks is still an issue for most network managers. Between the demands from network users to use their own wireless devices to the moves to an IoT connected world, it is vital that wireless networks are both secure and efficient. The purpose of our DDoS analysis is to demonstrate how DDoS monitoring can identify an attack in progress. Mervue Business Park Further analysis highlights that this activity is associated with storage sub domains within Drilling down further reveals that the traffic appears to originate from 4700 different servers. Capsa Free is a network analyzer that allows you to monitor network traffic, troubleshoot network issues and analyze packets. For most use cases, a URL search involves searching for either a full or partial website name to see who is accessing it. For this example I will use a LANGuardian installed on my own network to track down Bittorrent tunneling. This means that a malicious client can create an NTP request, but instead of using its own IP address as the source, it uses the IP address of the target network. Once you have LANGuardian deployed, you need to check two reports for DNSpionage activity. Now, lets take a look at NTP traffic associated with a DDoS attack. If your proxy or firewall is having performance issues you wont be able to access the logs to troubleshoot the problem. There can be many thousands of compromised clients in a given botnet. Designed in the early 1990s, HTTP is an application layer protocol that is sent over TCP, though any reliable transport protocol could theoretically be used. I want to know who is streaming Netflix onto my network? If you have a LANGuardian on your network you need to select the “Top Website Domains” report and use these filters. Both of these are important protocols so you cannot just block them. The LANGuardian traffic analysis engine may also be used to passively report on web activity. In the next example we are looking at what ports are accepting connections from external clients. The key thing to remember is that the notification is based on your Internet facing IP address, not your private IP address which is assigned to your laptop\PC\device. A term I often hear our customers say is that they use our LANGuardian product to “take a deep dive into network traffic“. Prior to the advent of CDNs, you could get a good understanding of a traffic flow by doing areverse DNS lookup of the source and destination IP address. It’s Friday and I am just back from visiting a number of LANGuardian customers in the UK. SPAN mirrors receive or send (or both) traffic on one or more source ports to a destination port for analysis. I recently attended a conference which brought together network and security professionals from colleges and universities all over the UK. Each of these attacks used spoofed packets based on UDP protocols like NTP or DNS. 7. In today’s world, the only way to accurately identify Bittorrent is to be application aware. Move forward to 2015 and sure enough a few shady neighbourhoods have appeared on the Internet. If we think of it as diving into a swimming pool, flow analysis is like getting your Speedos on and approaching the pool. Popcorn Time is a multi platform, open source BitTorrent client which includes an integrated media player. Note that the source IP is probably spoofed by the attackers. Download a 30 day trial of LANGuardian and find out what users are accessing suspicious top-level domains. Wireshark is the world’s foremost and widely-used network protocol analyzer. When I looked at my Skype text box at 6:00pm PST, 2:00am GMT a day late, I saw a message there for over 8 hours, with those 3 little words we dread to hear or read before we get to send them ourselves: ‘Happy Anniversary Darling’. For most networks DNS Would be the most active UDP protocol. If you want to prevent this from happening on your network you could block access to sites like PirateBay. The scenario is shown in the diagram below, showing how a single C&C, controls many zombie clients, to generate malformed NTP requests to many servers, which in turn send amplified responses to the target network. Standards include NetFlow, sFlow, JFlow and IPFIX. NetFort LANGuardian overcomes this problem by gathering and correlating traffic information from full-packet capture based on deep packet inspection (DPI) techniques. For example comes back as YouTube for example will have many subnets associated with their services, Log onto LANGuardian (or other network activity monitoring tool) and select, Enter as the subnet and this will reveal if you have any Netflix traffic on your network. Ports like 9100 or SMB which uses 445 should not be open for unknown clients. You need tools which can report on the number on connections on a per user or IP address basis. The video below shows how to set up a SPAN or mirror port to capture traffic at your network edge. User explained he was downloading research papers and doing nothing wrong. Sometimes this is accidental; a user copying hundreds of HD images onto a Dropbox folder, to more deliberate like using the workplace network to download movies. This is the second Ransomware themed post in our top 5 which indicates how much of a problem Ransomware was in 2016. NetFort provides network traffic and security monitoring software for virtual and physical networks. This is possible through the use of filters based on the subnets in use at the remote sites. It’s all become smart everything. Once you have a data source in place (SPAN\Mirror\TAP) you can then check for web server activity by searching for specific metadata such as a HTTP GET. Most of the basic Regular Expressions (RegEx) and IP Address/Subnet needs are covered in the LANGuardian Tip Sheet. One piece of information that can bring together network activity and devices is usernames. With the traffic analysis tool, you can spot things like large downloads, streaming or suspicious inbound or outbound traffic. Hardware-free solution: no costly reliance on ANPR or Bluetooth. Application recognition systems will help here as they will report on what protocols are in use, not just reports based on port numbers. In this blog post, we are going to look at two common network traffic monitoring scenarios and how to configure a SPAN port on a Cisco Nexus switch. Can The PirateBay directly slow down your network? Network switches maintain a list of what MAC addresses are associated with what network switch ports. You can extend/customize the scope of monitored objects by adding new items, writing custom data collection scripts, building custom templates, etc. We are always listening! Does not scale up. You just need to monitor network traffic going to and from your Internet gateways to gain visibility into what is happening and root out any suspicious activity. The HTTP headers will reveal what is actually happening. Network traffic analysis tools which use deep packet inspection technologies can capture wireless device metadata from HTTP headers. UK/EU: +44 207 060 2850 Blue Coat asserts that more than 95% of the sites on these 10 Top-Level Domains (TLDs) are suspect: We recommend that you monitor Internet traffic on your network and watch out for any client connecting to these suspicious TLDs. The ability to monitor network traffic in real-time is sufficient to achieve many objectives of network traffic monitoring, but sometimes real-time data is not enough. It provides for a passive way of capturing network packets which means it will not impact on network performance. If you use a Chrome browser then data associated with your YouTube activity uses the QUIC protocol. For example show me all the users who accessed Dropbox in the last week and how much data was uploaded. Examples of  URLs would be: URL: ftp://ftp.netfort.c0m/doc/languardian-tips.txt Which is safe since you don’t want to expose your production app traffic and debug app is limited to you. Its intuitive reporting and dashboards, drill down capabilities, and powerful searches provide extremely detailed information without requiring you to understand and interpret raw data packets. To monitor our home network we are going to use PRTG. When you hear something like ‘deep dive’ you could associate it with geeks in their Speedos taking a dive into a swimming pool. A connection from a local system to an external one over something like port 10921 would be unusual. So do we report the name or not? Comments welcome. switch(config-if)# exit In the following example, we see that there has been a peak in bandwidth usage over a remote link. Active Directory integration allows you to associate traffic flows with usernames too. Talos said the perpetrators of DNSpionage were able to steal email and other login credentials by hijacking the DNS servers for these targets, so that all email and virtual private networking (VPN) traffic was redirected to an Internet address controlled by the attackers. Many layer 3 type network devices like routers and some switches have flow export features. Many high definition movies are now 6GB+ in size so all it takes is for a few clients to clog up a network. The image below shows how this information can be then used to report on what is connecting to your network via wireless. An alternative way is to look at the IDS rule set in LANGuardian. Now for a moment, just think of some of the worst text or voicemail’s you could get from your wife! Technologies like this automate packet analysis so that you have 24/7 monitoring. In my case the third party is Eircom who in turn host services for Akamai and Microsoft uses them to distribute content. Galway Network Monitor 3.4 is the archive versioned tool for network traffic capture and protocol analysis. This has become more complicated as most content is now dynamic such as Facebook news feeds; so proxy servers are now mostly used for their site blocking capabilities. Over the last couple of days, Twitter users have been posting screenshots of unsolicited printouts from internet-connected printers that say that PewDiePie needs their help. The NTP server assumes the request is genuine and responds, sending the response, not to the originating client, but to the target network. If you use virtual environments like VMware, Hyper-V or VirtualBox, you will have virtual networks in place. For a long time, CDNs were only available to large organisations such as Microsoft and Adobe. Only packets matching a known active connection are allowed to pass through the firewall. Network Monitor is a smart decision support tool for traffic control centres, streetworks professionals and public event organisers. switch(config)# monitor session 2 Real time network traffic monitoring with NetFlow Analyzer. In my example this would allow me to capture traffic going to and from the Internet as well as traffic associated with important servers. To instantly access and report on web activity for a particular user name, IP or MAC address: It is also possible to automatically send a daily or weekly email summarizing the web activity for a particular user by saving this report with the required user name and then under configuration, top right using the email settings to schedule the report. The video below shows the steps needed to get traffic monitoring in place so that you can check for DNSpionage activity on your network. Another issue I often see are firewalls allowing  suspicious traffic through where a rule was misconfigured. You could also create a custom report which would allow you to search for specific IDS events like Netflix by following the guide here on the forum. Earlier I switched it on while I was monitoring its traffic with my LANGuardian. Here, we take a look at 5 methods for detecting and alerting on Ransomware activity. The printer exploit is an unusual one. Wireshark is a fantastic tool but sometimes because of the low level of detail, the ‘bits and bytes’, it is hard to see the big picture and see activity first at a higher level,  show names for example, domains, URIs, files, users, a level of DPI that most people can use to understand exactly what is happening. Check out this video below to see how you can set up a SPAN port to monitor internet activity. Can the tool be deployed in remote data centers and provide a single console to monitor all activity. Back to the customer, let’s get their opinion, listen to them. Market leading traffic management planning and communication tool. This is very normal and what I would expect. Captures domain names from SSL cert negotiation so you can accurately report on HTTPS activity. After the trial, the free version may be your best bet if you’re in charge of a small network. That while this is why, they could not access the logs and get any.... 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