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<p class=MsoNormal>Hello,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I am new to the list, and couldn’t find this discussed
in the archives:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Does anyone have a working version of nc/netcat that
supports tproxy? There appears to be several implementations of netcat,
but only found patches for a version that appears not to be available any
longer. I made a patch to netcat, but it’s not working and so I am
not certain if it’s a problem with my patch or my ip tables setup
(probably the later). Specific links to versions of netcat and patch for
it would be appreciated.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I do have kernel 2.6.29.3 and latest (or at least not more
than a couple months old) iptables.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>A quick sanity check that the following is possible:
(99.9% sure based on other comments on the list)<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Want to have a box with two NICs between the internet
and local machines, basically a router. (Although a bridge might be even better).<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Have that machine intercept all connections from local
machines -> internet with tproxy on all ports, and create matching connections
using src ip of original machines -> internet. (Interception of connections
the other way, internet -> local machines is not required, but will not hurt,
but obviously they have to be able to at least forward through ok).<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Do some custom stuff on the streams mainly for
monitoring, and also a little manipulation (mainly http redirects).<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Assuming the above is possible, will it be possible to keep
the same source port number on the outgoing connections? (Which would
mean two connections with the same src/dst pairs, but communicating on
different interfaces).<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>What should the ip tables rules look like for this to
function? <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Most of the examples I found are for more specific cases,
such as for use with squid on just port 80. I am not certain I understand
fully the interaction between the rules for iptables and the interaction with tproxy.
Is there someplace this is all documented, along with all the details from a
programmer perspective such as the use of setsockopt? (I think I just need
updated man pages?)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks in advance for any help/advice. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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