Blame extensions/libxt_TEE.man

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The \fBTEE\fP target will clone a packet and redirect this clone to another
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machine on the \fBlocal\fP network segment. In other words, the nexthop
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must be the target, or you will have to configure the nexthop to forward it
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further if so desired.
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.TP
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\fB\-\-gateway\fP \fIipaddr\fP
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Send the cloned packet to the host reachable at the given IP address.
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Use of 0.0.0.0 (for IPv4 packets) or :: (IPv6) is invalid.
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.PP
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To forward all incoming traffic on eth0 to an Network Layer logging box:
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.PP
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\-t mangle \-A PREROUTING \-i eth0 \-j TEE \-\-gateway 2001:db8::1