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IP Masquerading Interview Questions & Answers - Learning Mode
COOLINTERVIEW.COM OPERATING SYSTEMS INTERVIEW QUESTIONS IP MASQUERADING INTERVIEW QUESTIONS QUESTIONS & ANSWERS - LEARNING MODE

IP Masquerading Interview Questions & Answers - Learning Mode

IP masquerading is a form of network address translation (NAT) which allows internal computers with no known address outside their network, to communicate to the outside. It allows one machine to act on behalf of other machines. IP Masquerade is a networking function in Linux similar to the one-to-many (1:Many) NAT (Network Address Translation) servers found in many commercial firewalls and network routers.

Try IP Masquerading Interview Questions & Answers - Exam Mode

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IP Masquerading Interview Questions & Answers - Learning Mode
Try IP Masquerading Interview Questions & Answers - Exam Mode
Question: Assigning Private Network IP Addresses to the Internal LAN

Answer: Since all INTERNAL MASQed machines should NOT have official Internet assigned addressees, there must be a specific and accepted way to allocate addresses to those machines without conflicting with anyone else's Internet address.

From the original IP Masquerade FAQ:

RFC 1918 is the official document on which IP addresses are to be used in a non-connected or "private" network. There are 3 blocks of numbers set aside specifically for this purpose.

Section 3: Private Address Source: CoolInterview.com
Question: Can I configure IP MASQ to allow Internet users to
directly contact internal MASQed servers?


Answer: Yes! With IPPORTFW, you can allow ALL or only a select few Internet hosts to
contact ANY of your internal MASQed computers. This topic is completely
covered in Section 6.7 in this HOWTO.
Source: CoolInterview.com
Question: What is IP Masquerade?

Answer: IP Masquerade is a networking function in Linux similar to the one-to-many (1:Many) NAT (Network Address Translation) servers found in many commercial firewalls and network routers. For example, if a Linux host is connected to the Internet via PPP, Ethernet, etc., the IP Masquerade feature allows other "internal" computers connected to this Linux box (via PPP, Ethernet, etc.) to also reach the Internet as well. Linux IP Masquerading allows for this functionality even though these internal machin Source: CoolInterview.com
Question: Requirements for IP Masquerade on Linux 2.4.x


Answer: ** Please refer to IP Masquerade Resource for the latest information. ** "

* The newest 2.4.x kernels are now using both a completely new TCP/IP
network stack as well as a new NAT sub-system called NetFilter. Within
this NetFilter suite of tools, we now have a tool called IPTABLES for the
2.4.x kernels much like there was IPCHAINS for the 2.2.x kernels and
IPFWADM for the 2.0.x kernels. The new IPTABLES system is far more
powerful (combines several fun Source: CoolInterview.com
Question: IP MASQ works fine for a while but then it stops
working. A reboot seems to fix this. Why?


Answer: I bet you are using IPAUTOFW and/or you have it compiled into the kernel
huh?? This is a known problem with IPAUTOFW. It is recommend to NOT even
configure IPAUTOFW into the Linux kernel and use IPPORTFW option instead.
This is covered with more details in Section 6.7.
Source: CoolInterview.com
Question: Can IP Masquerade work with only ONE Ethernet network card?


Answer: Yes and no. With the "IP Alias" kernel feature, users can setup multiple
aliased interfaces such as eth0:1, eth0:2, etc but its is NOT recommended to
use aliased interfaces for IP Masquerading. Why? Providing a secure firewall
becomes very difficult with a single NIC card. In addition to this, you will
experience an abnormal amount of errors on this link since incoming packets
will almost simultaneously be sent out at the same time. Because of all this
and NIC cards now costs l Source: CoolInterview.com
Question: Compiling a new kernel if needed

Answer: If your private network contains any vital information, think carefully in terms of SECURITY before implementing IP Masquerade. By default, IP MASQ becomes a GATEWAY for you to get onto the Internet, but it also can allow someone from the Internet to possibly get into your internal network. Source: CoolInterview.com
Question: Who Doesn't Need IP Masquerade?

Answer: *

If your machine is a stand-alone Linux host connected to the Internet (setting up a firewall is a good idea though), or
*

if you already have multiple assigned public addresses for your OTHER machines, and
*

if you don't like the idea of a 'free ride' using Linux and feel more comfortable using expensive commercial tools to perform the exact same functionalities. Source: CoolInterview.com
Question: Who Can Benefit From IP Masquerade?

Answer: *

If you have a Linux host connected to the Internet and..
*

if you have internal computers running TCP/IP connected that are connected to this Linux box via on a network, and/or
*

if your Linux host has more than one modem and acts as a PPP or SLIP server connected to other computers, and these machines do not have official or public assigned IP addresses (i.e. addressed with private TCP/IP numbers).
*

If you want those OT Source: CoolInterview.com
Question: How does IP Masquerade Work?

Answer: * If your machine is a stand-alone Linux host connected to the Internet
(setting up a firewall is a good idea though), or

* if you already have multiple assigned public addresses for your OTHER
machines, and

* if you don't like the idea of a 'free ride' using Linux and feel more
comfortable using expensive commercial tools to perform the exact same
functionalities.



------------------------------------------------- Source: CoolInterview.com
Question: Configuring MacOS Based System Running Open Transport

Answer: 1.

If you haven't installed the appropriate driver software for your Ethernet adapter, do so now. Descriptions to perform this task is beyond the scope of this document.
2.

Open the TCP/IP Control Panel and choose 'User Mode ...' from the Edit menu. Make sure the user mode is set to at least 'Advanced' and click the 'OK' button.
3.

Choose 'Configurations...' from the File menu. Select your 'Default' co Source: CoolInterview.com
Question: Microsoft File and Print Sharing and Microsoft Domain clients don't work through IP Masq!



Answer: To properly support Microsoft's SMB protocol, an IP Masq module would need to
be written but there are three viable work-arounds. For more details, please
see [http://support.microsoft.com/default.aspx?scid=kb;en-us;172227] this
Microsoft KnowledgeBase article.

The first way to work around this problem is to configure IPPORTFW from
Section 6.7 and portfw TCP ports 137, 138, and 139 to the internal Windows
machine's IP address. Though this solution works, it would o Source: CoolInterview.com

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