vnet

IPv4 Virtual Networks emulator based on net + mount namespace technology for fast deployments of related labs activities.

This script provides simple virtual IPv4 interconnected networks from json predefined topologies given as argument. For each network entity a screen-based CLI is setup for management (see screen documentation). Internet access could be enabled through masquerading (iptables) via host machine interface.

Commands tested: arp, sysctl (routers), ifconfig, route, ip, iptables, ping, tcpdump, scapy3, wget, snort, nmap, ipsec, ssh

Wrappers implemented for:

• rsyslog
• nmap
• ssh
• strongswan
• (more to be added)

Developed and tested with Bash v5.0.3(1) shell on WSL2 Debian platform.

Usage:

   sudo ./vnet.sh <json_file>

Vnet UI configuration

In file vnetenv.sh set variable VTERM={"screen", "xterm"} for screen-style interraction or xterm-style, respectivelly.

Configuration specified in net1.json sample file:

      .1  (10.0.1.0/24)  .2	      .2  (10.0.2.0/24)  .1
| H1 | ------------------ |  Router  | ------------------- | H2 |
   veth0_h1     veth0_router	|   veth1_router      veth0_h2
				| veth2_router
				| .2
				| (10.0.3.0/24)
				|
				| veth0
		     	    | Host |
				| eth0 (wsl2)
				|
				|
				|
			    Internet

Configuration specified in net2.json sample file:

      .1  (10.0.1.0/24) .2	 .1 (10.0.2.0/24) .2       .1 (10.0.3.0/24) 2.
| H1 | ------------------ |  R1  | ---------------- |  R2  | ---------------- | H2 |

   veth0_h1    	    veth0_r1	veth1_r1      veth0_r2    veth1_r2	   veth0_h2