Changes between Initial Version and Version 1 of dSite/mConnectivity/cKernel

Timestamp:

Jan 7, 2015, 8:46:21 PM (9 years ago)

Author:

seskar

Comment:

—

dSite/mConnectivity/cKernel

@@ +1 @@
+== ip L2TP Connectivity To I2 ==
+
+=== Installing the Prerequisite Software ===
+
+We're using the ip l2tp tunnels that have been part of the linux kernels since verion 2.6.35. To use it you must load the l2tp_eth module (manually) as this support is not loaded automatically. Tunnels are built in a 2 stage process that uses ''/etc/network/interfaces'' and the script that brings the interfaces up (''tunnel.sh''). 
+
+''/etc/network/interfaces'' should look like:
+{{{
+# This file describes the network interfaces available on your system
+# and how to activate them. For more information, see interfaces(5).
+
+# The loopback network interface
+auto lo
+iface lo inet loopback
+
+# The primary network interface - this is the outbound interface (static assignment)
+auto eth0
+iface eth0 inet static
+        address XXX.YYY.ZZZ.111
+        netmask 255.255.255.224
+        gateway XXX.YYY.ZZZ.1
+        dns-nameservers 8.8.8.8
+
+auto eth1 
+iface eth1 inet manual
+}}}
+
+The convention we've adopted is that '''eth0 is the externally route-able interface''' and '''eth1''' is local subnet interface (please note that it doesn't need an IP address at this stage). The tunnel script (''tunnel.sh'') looks like:
+
+{{{
+#!/bin/bash                                                                    
+
+modprobe l2tp_eth
+ifconfig eth1 up
+
+ip l2tp add tunnel remote  128.6.192.147 local XXX.YYY.ZZZ.1111 \
+     tunnel_id 1 peer_tunnel_id 1 udp_sport 3000 udp_dport 3000 encap udp
+
+ip l2tp add session  name l2tpsess1 \
+        tunnel_id 1 session_id 1 peer_session_id 1
+
+ip link set l2tpsess1 up mtu 1446
+ip link add brvlan1 type bridge
+ip link set l2tpsess1 master brvlan1
+ip link set eth1 master brvlan1
+ifconfig brvlan1 up
+}}}
+
+This script preforms the following actions:
+ 1. Loads the l2tp kernel module
+ 1. Brings up the local interfaces
+ 1. Brings up the tunnel
+ 1. Creates the session for the interface
+ 1. Creates the bridge 
+ 1. Connects the session interface to the local (i.e. bridge the two interfaces)
+ 1. Brings the bridge up. 
+
+You can check the newly created bridge functionality after running the script by executing:
+    {{{
+root@landing1:/root# brctl show brvlan1
+bridge name     bridge id               STP enabled     interfaces
+brvlan1         8000.003048b19da9       no              eth1
+                                                        l2tpsess1
+    }}}
+
+