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If you are running Wireshark on the server which you are sending the UDP packet to, and not seeing the packet, then the packet never arrived at the server in the first place, as Doug Smythies said in comments. Since this appears to be the case, you will need to do some investigation. It is possible the Router is not creating the packet and sending it ...


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As well as the NFS port itself (port 2049), I think you will need to open the portmapper service port (111). I'm not smart enough to use iptables directly, so I would use ufw for this. You can restrict the allowed network range using CIDR addressing e.g. sudo ufw allow from 192.168.1.0/24 to any port 111 If that still doesn't work, you may need to ...


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Try. Change pleases of ip and port sudo iptables -A INPUT -s 2.2.2.2 -p tcp --dport 2049 -j ACCEPT


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Assuming that your mail server accepts the TCP connection (instead of telnet waiting for the connection to be dropped and you just typing away:)), try the following (you have errors in your SMTP conversation): telnet localhost 25 helo carlo.ru mail from:<test@localhost> rcpt to:<test@localhost> data test . exit It's helo or ehlo not hello and ...


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I found this link maybe can help you https://help.ubuntu.com/community/IptablesHowTo#Saving_iptables


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For outgoing connections, e.g.: sudo iptables -I OUTPUT -p tcp -m tcp --dport 22 -m state --state NEW,ESTABLISHED -j LOG --log-prefix "Outgoing SSH connection " Check the log entries: less /var/log/kern.log If you reboot, your iptables configuration disappears. Save your configuration with: sudo iptables-save > /etc/iptables.rules sudo nano ...


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No, iptables does not support jitter simulation.


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Use the iptables-save command instead. Firewall rules should never go into rc.local script. rc.local is the last thing to be executed. If a block rule has been placed into rc.local there is a small time frame where an attacker can exploit a rule not being in place. While it probably doesn't matter with this situation, it is still best to not get into a bad ...


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You ask 4 questions. I can answer 3 of them. Any required module will be loaded automatically by iptables when it is required. Some years ago, modules had to be specifically loaded. Some critical applications still force load the modules, so that there is no delay when iptables realizes it needs the module. Now, the issue with your MAC related iptables ...



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