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how do I set the MAC address in POSTROUTING?

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Subject: how do I set the MAC address in POSTROUTING?
From: sean <seandarcy2@gmail.com>
Date: Thu, 30 Nov 2006 19:23:07 -0500
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I want to use -m mac --mac-source on our server. Unfortunately, lots of packets are coming in without the MAC address set:

MAC-ADDRESS-TEST: IN=ppp0 OUT= MAC= SRC=ww.xx.yy.zz DST=zz.yy.xx.ww LEN=52 TOS=0x00 PREC=0x00 TTL=51 ID=41426 DF PROTO=TCP SPT=52437 DPT=445 WINDOW=63 RES=0x00 ACK URGP=0

This is from a linux client.

How do I set up the client to insert its MAC address? Can I use some mange voodoo on the client PSOTROUTING chain?

Is this even an iptables issue? Is the MAC address being stripped out somewhere?

sean



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