Difference between revisions of "Dummy Interface"

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(New page: Reference info: '''[http://www.faqs.org/docs/linux_network/x-087-2-iface.interface.html Linux Network Administrators Guide]''')
 
(→‎Removing The Linux Dummy-Network Interface)
 
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Reference info: '''[http://www.faqs.org/docs/linux_network/x-087-2-iface.interface.html Linux Network Administrators Guide]'''
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__TOC__
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== Installing The Linux Dummy-Network Interface ==
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If your '''[http://www.networksecuritytoolkit.org NST]''' system does not have an active NIC adapter installed or is off-line from the network, you can install a '''Dummy Network Interface Module''' to simulate a network computing environment. This can be quite useful for testing out various networking tools (e.g., '''[http://www.wireshark.org Wireshark]''' and '''[http://www.snort.org Snort]''') with the '''[http://www.networksecuritytoolkit.org Network Security Toolkit]''' when off-line. Use the following procedure to install the '''Linux Dummy-Network Interface''':
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1. Add an IP address and host name to your "/etc/hosts" table.
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For example, an Internet address of 10.0.0.1 would result in:
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echo 10.0.0.1 ${HOSTNAME} >> /etc/hosts;
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2. Preload the dummy network driver on the machine.
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If this command is successful, you do not receive any messages from the server.
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modprobe dummy;
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3. Create the interface(s) (Example: Network Interface: dummy1):
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ip link add dummy1 type dummy;
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4. Bind an IPv4 Address to Network Interface dummy1:
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ip addr add 10.0.0.1/24 dev dummy1;
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--Or --
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ip addr add ${HOSTNAME}/24 dev dummy1;
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5. Bring the dummy1 Network Interface up:
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ip link set dummy1 up;
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6. If you need to add more than one (1) dummy interface use the following:
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ip link add dummy2 type dummy;
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ip link add dummy3 type dummy;
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ip addr add 10.0.0.2/24 dev dummy2;
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ip addr add 10.0.0.3/24 dev dummy3;
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ip link set dummy2 up;
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ip link set dummy3 up;
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7. Check the network bindings with the linux '''[https://en.wikipedia.org/wiki/Iproute2 ip]''' command:
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[root@nst28-dev ~]# ip a
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1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
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    inet 127.0.0.1/8 scope host lo
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        valid_lft forever preferred_lft forever
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    inet6 ::1/128 scope host
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        valid_lft forever preferred_lft forever
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2: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
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    link/ether 36:f5:1b:3a:12:41 brd ff:ff:ff:ff:ff:ff
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    inet 10.0.0.1/24 scope global dummy1
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        valid_lft forever preferred_lft forever
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    inet6 fe80::34f5:1bff:fe3a:1241/64 scope link
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        valid_lft forever preferred_lft forever
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3: dummy2: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
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    link/ether 6a:5c:3f:56:dc:2d brd ff:ff:ff:ff:ff:ff
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    inet 10.0.0.2/24 scope global dummy2
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        valid_lft forever preferred_lft forever
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    inet6 fe80::685c:3fff:fe56:dc2d/64 scope link
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        valid_lft forever preferred_lft forever
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4: dummy3: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
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    link/ether 86:d5:9f:08:f1:32 brd ff:ff:ff:ff:ff:ff
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    inet 10.0.0.3/24 scope global dummy3
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        valid_lft forever preferred_lft forever
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    inet6 fe80::84d5:9fff:fe08:f132/64 scope link
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        valid_lft forever preferred_lft forever
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== Removing The Linux Dummy-Network Interface ==
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1. Unbind the dummy established Network Interface(s):
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ifconfig dummy1 down;
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ifconfig dummy2 down;
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ifconfig dummy3 down;
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2) Remove the dummy kernel module.
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rmmod dummy;
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== References ==
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Reference Info 1: '''[http://www.faqs.org/docs/linux_network/x-087-2-iface.interface.html Linux Network Administrators Guide]'''
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Reference Info 2: '''[https://en.wikipedia.org/wiki/Iproute2 iproute2]'''

Latest revision as of 08:09, 28 May 2018

Installing The Linux Dummy-Network Interface

If your NST system does not have an active NIC adapter installed or is off-line from the network, you can install a Dummy Network Interface Module to simulate a network computing environment. This can be quite useful for testing out various networking tools (e.g., Wireshark and Snort) with the Network Security Toolkit when off-line. Use the following procedure to install the Linux Dummy-Network Interface:


1. Add an IP address and host name to your "/etc/hosts" table. For example, an Internet address of 10.0.0.1 would result in: 

echo 10.0.0.1 ${HOSTNAME} >> /etc/hosts;


2. Preload the dummy network driver on the machine. If this command is successful, you do not receive any messages from the server. 

modprobe dummy;

3. Create the interface(s) (Example: Network Interface: dummy1): 

ip link add dummy1 type dummy;

4. Bind an IPv4 Address to Network Interface dummy1: 

ip addr add 10.0.0.1/24 dev dummy1;

--Or -- 

ip addr add ${HOSTNAME}/24 dev dummy1;

5. Bring the dummy1 Network Interface up: 

ip link set dummy1 up;

6. If you need to add more than one (1) dummy interface use the following: 

ip link add dummy2 type dummy;
ip link add dummy3 type dummy;
ip addr add 10.0.0.2/24 dev dummy2;
ip addr add 10.0.0.3/24 dev dummy3;
ip link set dummy2 up; 
ip link set dummy3 up;

7. Check the network bindings with the linux ip command: 

[root@nst28-dev ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
    link/ether 36:f5:1b:3a:12:41 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.1/24 scope global dummy1
       valid_lft forever preferred_lft forever
    inet6 fe80::34f5:1bff:fe3a:1241/64 scope link 
       valid_lft forever preferred_lft forever
3: dummy2: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
    link/ether 6a:5c:3f:56:dc:2d brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.2/24 scope global dummy2
       valid_lft forever preferred_lft forever
    inet6 fe80::685c:3fff:fe56:dc2d/64 scope link 
       valid_lft forever preferred_lft forever
4: dummy3: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
    link/ether 86:d5:9f:08:f1:32 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.3/24 scope global dummy3
       valid_lft forever preferred_lft forever
    inet6 fe80::84d5:9fff:fe08:f132/64 scope link 
       valid_lft forever preferred_lft forever

Removing The Linux Dummy-Network Interface

1. Unbind the dummy established Network Interface(s): 

ifconfig dummy1 down;
ifconfig dummy2 down;
ifconfig dummy3 down;

2) Remove the dummy kernel module. 

rmmod dummy;

References

Reference Info 1: Linux Network Administrators Guide

Reference Info 2: iproute2

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