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authorParménides GV <parmegv@sdf.org>2014-08-02 10:52:28 +0200
committerParménides GV <parmegv@sdf.org>2014-08-02 10:52:28 +0200
commit4aedacdf92ab2fc08a1e39618761bc1eb96427d6 (patch)
treef000311e97598ab3fc42e2bea23e6cb342ad166c /ics-openvpn-stripped/main/openvpn/contrib/openvpn-fwmarkroute-1.00/README
parentb28eeb08e8ec3baafdd9388cc5b70c6c84db9cf1 (diff)
parent0393ba6656ce6cf679a2c4663275b3ed0f1a34b9 (diff)
Merge branch 'bug/There-are-two-different-notifications-#5794' into develop
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+OpenVPN fwmark Routing
+Sean Reifschneider, <jafo@tummy.com>
+Thursday November 27, 2003
+==========================
+
+These scripts can be used with OpenVPN up and down scripts to set up
+routing on a Linux system such that the VPN traffic is sent via normal
+network connectivity, but other traffic to that network runs over the VPN.
+The idea is to allow encryption of data to the network the remote host is
+on, without interfering with the VPN traffic. You can't simply add a route
+to the remote network, becaues that will cause the VPN traffic to also try
+to run over the VPN, and breaks the VPN.
+
+These scripts use the Linux "fwmark" iptables rules to specify routing
+based not only on IP address, but also by port and protocol. This allows
+you to effectively say "if the packet is to this IP address on this port
+using this protocol, then use the normal default gateway, otherwise use the
+VPN gateway.
+
+This is set up on the client VPN system, not the VPN server. These scripts
+also set up all ICMP echo-responses to run across the VPN. You can
+comment the lines in the scripts to disable this, but I find this useful
+at coffee shops which have networks that block ICMP.
+
+To configure this, you need to set up these scripts as your up and down
+scripts in the config file. You will need to set these values in the
+config file:
+
+ up /etc/openvpn/fwmarkroute.up
+ down /etc/openvpn/fwmarkroute.down
+ up-restart
+ up-delay
+
+ setenv remote_netmask_bits 24
+
+Note: For this to work, you can't set the "user" or "group" config options,
+because then the scripts will not run as root.
+
+The last setting allows you to control the size of the network the remote
+system is on. The remote end has to be set up to route, probably with
+masquerading or NAT. The network this netmask relates to is calculated
+using the value of "remote" in the conf file.
+
+Sean