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Fortunately, we can use NBNS traffic to identify hostnames for computers running Microsoft Windows or Apple hosts running MacOS.
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We can easily correlate the MAC address and IP address for any frame with 1 as shown in Figure 4.įigure 4: Correlating the MAC address with the IP address from any frame Host Information from NBNS Trafficĭepending on how frequently a DHCP lease is renewed, you might not have DHCP traffic in your pcap. Based on the hostname, this device is likely an iPad, but we cannot confirm solely on the hostname. In this case, the hostname for 1 is Rogers-iPad and the MAC address is 7c:6d:62:d2:e3:4f. Client Identifier details should reveal the MAC address assigned to 1, and Host Name details should reveal a hostname.įigure 2: Expanding Bootstrap Protocol line from a DHCP requestįigure 3: Finding the MAC address and hostname in a DHCP request Expand the lines for Client Identifier and Host Name as indicated in Figure 3. Go to the frame details section and expand the line for Bootstrap Protocol (Request) as shown in Figure 2. Select one of the frames that shows DHCP Request in the info column.
Note: With Wireshark 3.0, you must use the search term dhcp instead of bootp.įigure 1: Filtering on DHCP traffic in Wireshark This filter should reveal the DHCP traffic. Open the pcap in Wireshark and filter on bootp as shown in Figure 1. This pcap is for an internal IP address at 1. The first pcap for this tutorial, host-and-user-ID-pcap-01.pcap, is available here. NBNS traffic is generated primarily by computers running Microsoft Windows or Apple hosts running MacOS. DHCP traffic can help identify hosts for almost any type of computer connected to your network. How do we find such host information using Wireshark? We filter on two types of activity: DHCP or NBNS.
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If you have access to full packet capture of your network traffic, a pcap retrieved on an internal IP address should reveal an associated MAC address and hostname. In most cases, alerts for suspicious activity are based on IP addresses.
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This tutorial offers tips on how to gather that pcap data using Wireshark, the widely used network protocol analysis tool. (Note, these columns appear waaaay to the right in the capture and you'll have to scroll over quite a bit)Ģ. If you select the Loopback interface, you will see all DNS queries that are sent through the dnscryptproxy, but you will not see the true destination IP address for domains on the Internal Domains list it will, however, display the query and answer.When a host is infected or otherwise compromised, security professionals need to quickly review packet captures (pcaps) of suspicious network traffic to identify affected hosts and users. If you select the regular network interface, you will see only queries that are on the Internal Domains list, or that did not specifically go through the dnscryptproxy. A huge advantage of using this, is that you can sniff packets while the Roaming Client service is disabled, start the capture, and suddenly you're seeing every DNS query that the Roaming Client sends from the moment it starts, rather than starting a capture after the Roaming Client has already started.ġ.
This is a lightweight and easy-to-use tool.
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In normal circumstances the traffic between the Roaming Client and Umbrella is encrypted and not human readable.