The setup might seem a bit complex, but once you understand it and become familiar with it, it will ease your work so much.Ĭreate a test network namespace: ip netns add testĬreate a pair of virtual network interfaces (veth-a and veth-b): ip link add veth-a type veth peer name veth-bĬhange the active namespace of the veth-a interface: ip link set veth-a netns testĬonfigure the IP addresses of the virtual interfaces: ip netns exec test ifconfig veth-a up 192.168.163.1 netmask 255.255.255.0 If your kernel allows it, capturing the network traffic of a single process is very easily done by running the said process in an isolated network namespace and using wireshark (or other standard networking tools) in the said namespace as well. Where and are network specifiers, such as 10.0.0.0/8.I know this thread is a bit old but I think this might help some of you: You can look for external recursive queries with a filter such as udp port 53 and (udp & 1 = 1) and src net not and src net not On many systems, you can say "port domain" rather than "port 53".ĭNS servers that allow recursive queries from external networks can be used to perform denial of service (DDoS) attacks. However, DNS traffic normally goes to or from port 53, and traffic to and from that port is normally DNS traffic, so you can filter on that port number.Ĭapture only traffic to and from port 53: port 53 You cannot directly filter DNS protocols while capturing if they are going to or from arbitrary ports. Show only the DNS based traffic: dns Capture Filter Display FilterĪ complete list of DNS display filter fields can be found in the display filter reference
The SampleCaptures has many DNS capture files. TCP_Reassembly has to be enabled for this feature to work. As you might have guessed, this takes a DNS request or reply that has been split across multiple TCP segments and reassembles it back into one message. The DNS dissector has one preference: "Reassemble DNS messages spanning multiple TCP segments".
Also add info of additional Wireshark features where appropriate, like special statistics of this protocol. XXX - Add example traffic here (as plain text or Wireshark screenshot). The well known TCP/UDP port for DNS traffic is 53. TCP/ UDP: Typically, DNS uses TCP or UDP as its transport protocol.
HistoryĭNS was invented in 1982-1983 by Paul Mockapteris and Jon Postel. DNS is the system used to resolve store information about domain names including IP addresses, mail servers, and other information.
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