Mailinglist Archive: opensuse-security (757 mails)

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AW: AW: [suse-security] IP Forwarding - HELP
  • From: "OKDesign oHG Security Administrator" <security@xxxxxxxxxxx>
  • Date: Wed, 9 Jan 2002 08:35:14 +0100
  • Message-id: <GFENKFFEGFMPFOMBKMCMCEPICEAA.security@xxxxxxxxxxx>
Here are two URL for iptables which were sent to me in answer to my question
about masquerading:

http://bolug.uni-bonn.de/wissen/masquerading.html

http://www.fruehbrodt.org/artikel/netfilter.html

Stephan

-----Urspr√ľngliche Nachricht-----
Von: nico@xxxxxxxxxx [mailto:nico@xxxxxxxxxx]
Gesendet: Mittwoch, 9. Januar 2002 07:45
An: OKDesign oHG Security Administrator
Betreff: Re: AW: [suse-security] IP Forwarding - HELP


Hi,

I'm trying to achive exactly the same with a Linux 2.4 kernel.

Would you mind sending me the info as well?

Thanks

Nico

> Hi Dan,
>
> it depends on which Kernel-version you use. If you use 2.4 you need
> iptables. Exactly this point was discussed during the last days (I'm
> sure on this 'cause it was me who asked about Masquerading *g*). If
> you use 2.2 or earlier you need ipchains. Which syntax should be used
> has been written in my first post about this. If you don't have it
> anymore, tell me. I can write it again. Back to the roots of your
> question: IP-forwarding alone is not enough. You need Masquerading
> because the (ethernet-)IP of your Windozebox is a private IP and not
> able to be routed over the internet. So the linux-box has to change
> the sender-IP of the packets to his official IP (granted from your
> provider, most likely to be a dynamic one) in order to enable
> answer-packets to find the way back to you. Then your router (the
> linux-box acts exactly like a router) send the answers back to your
> windozebox. This is what masquerading means. Again, tell your
> kernelversion and we can tell you the syntax.
>
> Stephan
>
> -----Urspr√ľngliche Nachricht-----
> Von: Dan Banyard [mailto:dan@xxxxxxxxxxxxxxxxxxx]
> Gesendet: Mittwoch, 9. Januar 2002 04:20
> An: suse-security@xxxxxxxx
> Betreff: [suse-security] IP Forwarding - HELP
>
>
> Hi
>
> I have two machine, one Windows NT box and a Linux box (which is
> connected to the www via a modem) and these two machine are connected
> directly via ethernet.
>
> I am trying to set up my Linux box so I can get access to the www from
> the Windows NT box via the Linux box. So far I have enabled IP
> Forwarding in the rc.config file. I am really unsure what to do now
> to get this to work - I have read countless linux documents about
> setting up masquerading but the examples don't seem to comply with
> Suse. Do I have to enable the firewall to get this working ? are
> there others things I have to set ?
>
> Any help would be great.
>
> Thanks
>
> Dan
>
>
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