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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 only work for ONE
internal machine.

The second solution is to install and configure [http://www.samba.org] Samba
on the Linux MASQ server. With Samba running, you can then map your internal
Windows File and Print shares onto the Samba server. Then, you can mount
these newly mounted SMB shares to all of your external clients. Configuring
Samba is fully covered in a HOWTO found in a Linux Documentation Project and
in the TrinityOS document as well.

The third solution is to configure a VPN (virtual private network) between
the two Windows machines or between the two networks. This can either be done
via the PPTP or IPSEC VPN solutions. There is a Section 7.35 patch for Linux
and also a full IPSEC implementation available for both 2.0.x and 2.2.x
kernels. This solution would probably be the most reliable and secure method
of all three solutions.

All of these solutions are NOT covered by this HOWTO. I recommend that you
look at the TrinityOS documentation for IPSEC help and John Hardin's PPTP
page for more information.

Also PLEASE understand that Microsoft's SMB protocol is VERY insecure.
Because of this, running either Microsoft File and Print sharing or Windows
Domain login traffic over the Internet without any encryption is a VERY BAD
idea.



Category IP Masquerading Interview Questions & Answers - Exam Mode / Learning Mode
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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 only work for ONE
internal machine.

The second solution is to install and configure [http://www.samba.org] Samba
on the Linux MASQ server. With Samba running, you can then map your internal
Windows File and Print shares onto the Samba server. Then, you can mount
these newly mounted SMB shares to all of your external clients. Configuring
Samba is fully covered in a HOWTO found in a Linux Documentation Project and
in the TrinityOS document as well.

The third solution is to configure a VPN (virtual private network) between
the two Windows machines or between the two networks. This can either be done
via the PPTP or IPSEC VPN solutions. There is a Section 7.35 patch for Linux
and also a full IPSEC implementation available for both 2.0.x and 2.2.x
kernels. This solution would probably be the most reliable and secure method
of all three solutions.

All of these solutions are NOT covered by this HOWTO. I recommend that you
look at the TrinityOS documentation for IPSEC help and John Hardin's PPTP
page for more information.

Also PLEASE understand that Microsoft's SMB protocol is VERY insecure.
Because of this, running either Microsoft File and Print sharing or Windows
Domain login traffic over the Internet without any encryption is a VERY BAD
idea.
Source: CoolInterview.com



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