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 Sumit 

TechTalkSecurity

IT Professional (Cyber Security)

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Configure IPsec site-to-site VPN in Linux Machine

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 Configure IPsec site-to-site VPN in Linux Machine: Update the system and install the package  apt update && sudo apt upgrade -y  apt install strongswan -y Check if the following kernel parameter is set or not sysctl net.ipv4.ip_forward=1 To list all configured parameters: sysctl -a root@ubuntu-server-main:~# sysctl net.ipv4.ip_forward=1 net.ipv4.ip_forward = 1 root@ubuntu-server-main:~# sysctl net.ipv4.conf.all.accept_redirects=0 net.ipv4.conf.all.accept_redirects = 0 root@ubuntu-server-main:~# sysctl net.ipv4.conf.all.send_redirects=0 net.ipv4.conf.all.send_redirects = 0 root@ubuntu-server-main:~# Network Diagram: IPsec Config: Configure the PSK and update the VPN endpoints ++++++++++++++ cat /etc/ipsec.secrets # source      destination 192.168.0.2   192.168.0.108 : PSK "87zRQqylaoeF5I8o4lRhwvmUzf+pYdDpsCOlesIeFA/2xrtxKXJTbCPZgqplnXgPX5uprL+aRgxD8ua7MmdWaQ" ++++++++++++++ cat /etc/ipsec.conf: config setup         charondebug="all"         uniqueids=yes  
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TACACS+ Installation on Linux [CentOS]

 TACACS+  Installation on CentOS: In the example below I will show you how to install tac_plus on a CentOS server. There’s a RPM available so this will save you the hassle of compiling the source code yourself. Let’s add the repository first: [root@server ~]# cd /etc/yum.repos.d/ [root@server yum.repos.d]# vim nux-misc.repo We will create a new repository file where we can grab tac_plus. This is what you should enter: [nux-misc] name=Nux Misc baseurl=http://li.nux.ro/download/nux/misc/el6/x86_64/ enabled=0 gpgcheck=1 gpgkey=http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro Save the file and install tac_plus with the following command: [root@server ~]# yum --enablerepo=nux-misc install tac_plus That’s all you need to do. All configuration is done from a single config file. Let’s take a look at its contents: [root@server /]# vim /etc/tac_plus.conf You will see a lot of things in this default configuration file. Let me walk you through some of the fields. The first thing you see is a key,
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Free Radius setup/configuration in Linux [Ubuntu/CentOS]

Free Radius setup/configuration in Linux [Ubuntu/CentOS]   1) Free RADIUS Client: CentOS:  yum install freeradius-utils Ubuntu: apt-get install freeradius-utils   2) Free RADIUS Server: Add the client device to free RADIUS server: i) vi /etc/freeradius/3.0/clients.conf  ii) Append below lines to the file above ############# client FortiGate-VM64-Xen {        ipaddr           = 192.168.0.108        secret           = testing123 } client sumit-linux-amp {        ipaddr           = 192.168.0.190        secret           = testing123 } #############   iii) Add users to the RADIUS server: Append below lines to the file "users" > vi /etc/freeradius/3.0/users #############  sumit1 Cleartext-Password := "password" sumit2 Cleartext-Password := "password"   #############   iv) restart the free RADIUS services: Ubuntu: > systemctl restart freeradius   CentOS: >  systemctl restart freeradius                   > sudo firewall-cmd --add-service={http,https,ra
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