Merge tag 'i3c/for-6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux
[linux-block.git] / Documentation / networking / ip_dynaddr.rst
CommitLineData
9de1fcdf
MCC
1.. SPDX-License-Identifier: GPL-2.0
2
3==================================
1da177e4 4IP dynamic address hack-port v0.03
9de1fcdf
MCC
5==================================
6
1da177e4
LT
7This stuff allows diald ONESHOT connections to get established by
8dynamically changing packet source address (and socket's if local procs).
9It is implemented for TCP diald-box connections(1) and IP_MASQuerading(2).
10
9de1fcdf
MCC
11If enabled\ [#]_ and forwarding interface has changed:
12
1da177e4
LT
13 1) Socket (and packet) source address is rewritten ON RETRANSMISSIONS
14 while in SYN_SENT state (diald-box processes).
15 2) Out-bounded MASQueraded source address changes ON OUTPUT (when
16 internal host does retransmission) until a packet from outside is
17 received by the tunnel.
18
19This is specially helpful for auto dialup links (diald), where the
9de1fcdf 20``actual`` outgoing address is unknown at the moment the link is
1da177e4
LT
21going up. So, the *same* (local AND masqueraded) connections requests that
22bring the link up will be able to get established.
23
9de1fcdf
MCC
24.. [#] At boot, by default no address rewriting is attempted.
25
26 To enable::
27
1da177e4 28 # echo 1 > /proc/sys/net/ipv4/ip_dynaddr
9de1fcdf
MCC
29
30 To enable verbose mode::
31
32 # echo 2 > /proc/sys/net/ipv4/ip_dynaddr
33
34 To disable (default)::
35
1da177e4
LT
36 # echo 0 > /proc/sys/net/ipv4/ip_dynaddr
37
38Enjoy!
39
9de1fcdf 40Juanjo <jjciarla@raiz.uncu.edu.ar>