12/19/2023 0 Comments Netstat udp ports![]() I plan to also do one for tinydns and then allow dnscache to find the tinydns to implement split-horizon dns with two cooperating Docker containers. The logs can be stored and rotated using switches to the docker run command. It dispenses with DJB’s daemontools and multilog and does it the “docker way”. RUN wget -qO- | perl -ane ‘if ($F eq “A”) ’ > (cd $IP_DIR touch $CLIENT_IPS) ![]() RUN dd if=/dev/urandom of=/etc/dnscache/seed bs=128 count=1 & chmod 600 /etc/dnscache/seed ![]() RUN groupadd $DNSCACHE_USER -g $GID & useradd $DNSCACHE_USER -s /bin/false -d $DNSCACHE_DIR -u $UID -g $GID RUN apt-get update & apt-get install -y dbndns wget I’ll put this up on bitbucket later but for now, this is a Dockerfile for dnscache: Well, I’m not sure entirely what was going on before but now I’ve got it working. The Internet Assigned Numbers Authority maintains a listing of services using these ports in order to minimize conflicting uses. Netstat derived from the words network and statistics is a program that’s controlled via commands issued in the command line.It delivers basic statistics on all network activities and informs users on which ports and addresses the corresponding connections TCP and UDP are running and which ports are open for tasks. Use the netstat command to list all open ports, including TCP and UDP, which are the most common protocols for packet transmission in the network layer. connection timed out no servers could be idea what’s going on? TCP and UDP port numbers between 101 are called registered ports. Wed Mar 2 16:08:54 UTC even though the docker host see the udp port listening (172,17.2.110 is an ip alias) it doesn’t netstat -uln | grep 172.17.2.110:53 Udp6 0 0 :domain dnscache actually works inside the docker -H :2375 exec -ti 4c47 dig +short proof this dnscache is actually getting used (inside the docker -H :2375 exec -ti 4c47 ls -l /etc/dnscache/log/main/current When you find a product in this list, search (Command-F) in your browser for that name, then repeat your search (Command-G) to locate all occurrences of that product. For example, a VPN service can use up to four different ports. Proto Recv-Q Send-Q Local Address Foreign Address State Some services might use more than one of these ports. It’s running: docker -H :2375 psĬONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESĤc47ff914f5d jeff/jdns1 "/init.sh" 53 minutes ago Up 53 minutes 172.17.2.110:53->53/tcp, 172.17.2.110:53->53/udp the container dnscache is listening on docker -H :2375 exec -ti 4c47 netstat -luĪctive Internet connections (only servers) Also, the routing table, which gives information about the data packets’ journey through the network, can be displayed with the help of netstat.So I built a docker container that runs dnscache (from djbdns/dbndns). ![]() Thanks to the detailed statistics, you can also get information about the packets transferred since the last system start and any errors that occurred. For this reason, you should regularly check the ports opened by your system. ![]() Moreover, there is a possibility that a Trojan that is already in your system may install a so-called backdoor and open a corresponding port in the process. The big problem with these open ports is the fact that they offer third parties the opportunity to sneak malware into your system. These connections are established via the respective network address, which indicates, among other things, which port was opened in advance for data exchange. Knowing about the incoming and outgoing connections of your computer or server gives you a big advantage in the fight against disproportionate traffic and malicious software. ![]()
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