From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001 From: root Date: Fri, 25 Dec 2015 04:40:36 +0000 Subject: initial_commit --- Documentation/networking/ip_dynaddr.txt | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 Documentation/networking/ip_dynaddr.txt (limited to 'Documentation/networking/ip_dynaddr.txt') diff --git a/Documentation/networking/ip_dynaddr.txt b/Documentation/networking/ip_dynaddr.txt new file mode 100644 index 00000000..45f3c126 --- /dev/null +++ b/Documentation/networking/ip_dynaddr.txt @@ -0,0 +1,29 @@ +IP dynamic address hack-port v0.03 +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +This stuff allows diald ONESHOT connections to get established by +dynamically changing packet source address (and socket's if local procs). +It is implemented for TCP diald-box connections(1) and IP_MASQuerading(2). + +If enabled[*] and forwarding interface has changed: + 1) Socket (and packet) source address is rewritten ON RETRANSMISSIONS + while in SYN_SENT state (diald-box processes). + 2) Out-bounded MASQueraded source address changes ON OUTPUT (when + internal host does retransmission) until a packet from outside is + received by the tunnel. + +This is specially helpful for auto dialup links (diald), where the +``actual'' outgoing address is unknown at the moment the link is +going up. So, the *same* (local AND masqueraded) connections requests that +bring the link up will be able to get established. + +[*] At boot, by default no address rewriting is attempted. + To enable: + # echo 1 > /proc/sys/net/ipv4/ip_dynaddr + To enable verbose mode: + # echo 2 > /proc/sys/net/ipv4/ip_dynaddr + To disable (default) + # echo 0 > /proc/sys/net/ipv4/ip_dynaddr + +Enjoy! + +-- Juanjo -- cgit v1.2.3