https://wiki.plecko.hr/ 2026-04-25T16:56:43+00:00 https://wiki.plecko.hr/ https://wiki.plecko.hr/lib/tpl/bootstrap3/images/favicon.ico text/html 2019-11-20T08:41:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.plecko.hr/doku.php?id=linux:networking:auto_openconnect&rev=1574235660&do=diff Always on openconnect Saving passwords in plain text is bad! * * * * * /root/oc.sh #!/bin/bash target=$1 count=$( ping -c 1 10.1.2.3 | grep icmp* | wc -l ) if [ $count -eq 0 ] then echo "VPN is down." echo "password" | sudo openconnect vpn.example.com -u username --passwd-on-stdin --no-cert-check else echo "VPN is UP" fi text/html 2022-11-04T13:51:27+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.plecko.hr/doku.php?id=linux:networking:bridged_adapter&rev=1667566287&do=diff Ubuntu Netplan bridged adapter network: ethernets: eth0: dhcp4: false dhcp6: false bridges: br0: interfaces: - eth0 addresses: - 172.16.0.51/24 macaddress: 00:15:5d:01:6a:1d nameservers: addresses: - 10.0.0.2 search: - home.local routes: - to: default via: 172.16.0.1 mtu: 1500 version: 2 text/html 2019-10-31T09:05:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.plecko.hr/doku.php?id=linux:networking:compare_zone_on_two_dns_servers&rev=1572509100&do=diff Compare DNS zone on two different DNS servers diff <(sort -u <(dig +nottlid +noall +answer @10.0.0.10 example.com TXT -t axfr) ) <(sort -u <(dig +nottlid +noall +answer @10.0.0.11 example.com TXT -t axfr) ) Works in bash Query txt records with nslookup: text/html 2019-10-31T09:05:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.plecko.hr/doku.php?id=linux:networking:disable_ipv6&rev=1572509100&do=diff Disable IPv6 on Ubuntu Method 1: sysctl sudo gedit /etc/sysctl.conf Append to end of file # IPv6 disabled net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1 Save the file and close it. Restart sysctl with text/html 2019-10-31T09:05:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.plecko.hr/doku.php?id=linux:networking:iptables&rev=1572509100&do=diff Automatic load of iptables rules on Ubuntu The fact that iptables is empty on each boot is both beautiful and iritating! You can mess everything up, and just reboot the PC to get a clean start (or just empty the rules - to be faster). But what if you want the rules to apply even after reboot? Here are a few ways to d othis: text/html 2019-10-31T09:05:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.plecko.hr/doku.php?id=linux:networking:openvpn&rev=1572509100&do=diff Setup OpenVPN server and client Introduction Want to access the Internet safely and securely from your smartphone or laptop when connected to an untrusted network such as the WiFi of a hotel or coffee shop? A Virtual Private Network (VPN) allows you to traverse untrusted networks privately and securely as if you were on a private network. The traffic emerges from the VPN server and continues its journey to the destination. text/html 2019-10-31T09:05:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.plecko.hr/doku.php?id=linux:networking:proxy&rev=1572509100&do=diff Debian set proxy Edit /etc/profile.d/proxy.sh, add export http_proxy=http://192.168.0.1:3128 export https_proxy=http://192.168.0.1:3128 export ftp_proxy=http://192.168.0.1:3128 Edit /etc/apt/apt.conf.d/99HttpProxy, add Acquire::http::Proxy "http://192.168.0.1:3128"; Acquire::https::Proxy "http://192.168.0.1:3128"; Acquire::ftp::Proxy "http://192.168.0.1:3128"; text/html 2019-10-31T09:05:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.plecko.hr/doku.php?id=linux:networking:smtp_response_codes&rev=1572509100&do=diff SMTP Status Codes This document describes the set of extended status codes for use within the SMTP mail system for delivery status reports, tracking, and improved diagnostics. In combination with other information provided in the Delivery Status Notification (DSN) delivery report, these codes facilitate media and language independent rendering of message delivery status. text/html 2019-10-31T09:05:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.plecko.hr/doku.php?id=linux:networking:start&rev=1572509100&do=diff Networking * Always on openconnect * Automatic load of iptables rules on Ubuntu * Compare DNS zone on two different DNS servers * Debian set proxy * Disable IPv6 on Ubuntu * Forward local internet through ssh tunnel * Setup OpenVPN server and client * SMTP Status Codes * Static network IP on Ubuntu server * Ubuntu Netplan bridged adapter * Ubuntu PPTP VPN internet gateway text/html 2019-10-31T09:05:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.plecko.hr/doku.php?id=linux:networking:static_ip&rev=1572509100&do=diff Static network IP on Ubuntu server Configuring IP address on Ubuntu server without using any tools other than a text editor Version 18.04 The new interfaces configuration file now lives in the /etc/netplan directory. There are two renderers: NetworkManager and networkd. text/html 2019-10-31T09:05:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.plecko.hr/doku.php?id=linux:networking:tunnel_internet_through_ssh&rev=1572509100&do=diff Forward local internet through ssh tunnel Install http proxy on local machine, and bind it to port 8080 ssh -R 8080:<local IP>:8080 user@<remote IP> export http_proxy=http://<local IP>:8080 export https_proxy=http://<local IP>:8080 sudo visudo #append text Defaults env_keep = "http_proxy https_proxy ftp_proxy" text/html 2019-10-31T09:05:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.plecko.hr/doku.php?id=linux:networking:ubuntu_pptp_gateway&rev=1572509100&do=diff Ubuntu PPTP VPN internet gateway This is tested on Digital Ocean - use this link to get 10$ Setup PPTP Server First we need to install pptp server using apt-get # sudo apt-get install pptpd Then we need to configure the pptpd. # sudo nano /etc/pptpd.conf Add server IP and client IP at the end of the file. You can add like below: