.. SPDX-License-Identifier: GPL-2.0
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==================================
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IP dynamic address hack-port v0.03
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==================================
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This stuff allows diald ONESHOT connections to get established by
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dynamically changing packet source address (and socket's if local procs).
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It is implemented for TCP diald-box connections(1) and IP_MASQuerading(2).
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If enabled\ [#]_ and forwarding interface has changed:
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1) Socket (and packet) source address is rewritten ON RETRANSMISSIONS
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while in SYN_SENT state (diald-box processes).
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2) Out-bounded MASQueraded source address changes ON OUTPUT (when
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internal host does retransmission) until a packet from outside is
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received by the tunnel.
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This is specially helpful for auto dialup links (diald), where the
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``actual`` outgoing address is unknown at the moment the link is
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going up. So, the *same* (local AND masqueraded) connections requests that
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bring the link up will be able to get established.
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.. [#] At boot, by default no address rewriting is attempted.
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To enable::
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# echo 1 > /proc/sys/net/ipv4/ip_dynaddr
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To enable verbose mode::
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# echo 2 > /proc/sys/net/ipv4/ip_dynaddr
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To disable (default)::
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# echo 0 > /proc/sys/net/ipv4/ip_dynaddr
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Enjoy!
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Juanjo <jjciarla@raiz.uncu.edu.ar>
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