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Old 09-21-2016, 09:53 PM   #1
Registered: Oct 2009
Posts: 70

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iptables tee packets from a mirrored interface

Objective: to copy/tee packets coming from eth1 and send to a destination IP via the eth0 management port
ServerA = eth1 (connected to a switch1 span port)
eth0 (connected to switch2 as management port)
(IP is
ServerB destination IP =

1. I can received mirrored packets (e.g. DHCP,DNS) from eth1
2. Tried to tee using this command
iptables -t mangle -A PREROUTING -j TEE --gateway can received those packets coming from (e.g. ping/ssh etc)

Problem is we want to send the mirrored packets of eth1.
tcpdump eth0 we cannot even see the packets.

So is bridging the interfaces is the solution on this?
We tried to bridge it but our switch2 will have BPDU err disable everytime we bring eth0 & eth1 together. Is ebtables needed to filter this?

Appreciate your input on this. Thanks.
Old 09-22-2016, 03:14 PM   #2
Senior Member
Registered: Apr 2009
Posts: 1,850

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Should be 'iptables -t mangle -A PREROUTING -i eth1 -j TEE --gateway' if you want to mirror eth1.
Old 09-24-2016, 11:31 PM   #3
Registered: Oct 2009
Posts: 70

Original Poster
Rep: Reputation: 21
thanks nini09. I figured already using the ebtables & iptables combinations. have a good day to all!
here's how I did it



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