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authorcurrite <sll@disroot.org>2020-11-03 21:10:59 +0100
committercurrite <sll@disroot.org>2020-11-03 21:10:59 +0100
commit082a764785aca7b196977f828a8cdc3ceedc8011 (patch)
tree6bc57125afc13476525d1203548fc2c0c722545e
parentd09ccc9cf73b3fde99d22c50584abdfda853b792 (diff)
downloadvyos-documentation-082a764785aca7b196977f828a8cdc3ceedc8011.tar.gz
vyos-documentation-082a764785aca7b196977f828a8cdc3ceedc8011.zip
tunnels/gre: add gre-bridge and gre keys
-rw-r--r--docs/interfaces/tunnel.rst41
1 files changed, 41 insertions, 0 deletions
diff --git a/docs/interfaces/tunnel.rst b/docs/interfaces/tunnel.rst
index da452a8b..ffa6b893 100644
--- a/docs/interfaces/tunnel.rst
+++ b/docs/interfaces/tunnel.rst
@@ -112,6 +112,47 @@ The Cisco router defaults to 'gre ip' otherwise it would have to be configured a
tunnel source 203.0.113.10
tunnel destination 198.51.100.2
+
+Tunnel keys
+^^^^^^^^^^^
+
+GRE is also the only classic protocol that allows creating multiple tunnels with the same source and destination due to its support for tunnel keys. Despite its name, this feature has nothing to do with security: it's simply an identifier that allows routers to tell one tunnel from another.
+
+An example:
+
+.. code-block:: none
+
+ set interfaces tunnel tun0 local-ip 192.0.2.10
+ set interfaces tunnel tun0 remote-ip 192.0.2.20
+ set interfaces tunnel tun0 address 10.40.50.60/24
+ set interfaces tunnel tun0 parameters ip key 10
+
+.. code-block:: none
+
+ set interfaces tunnel tun0 local-ip 192.0.2.10
+ set interfaces tunnel tun0 remote-ip 192.0.2.20
+ set interfaces tunnel tun0 address 172.16.17.18/24
+ set interfaces tunnel tun0 parameters ip key 20
+
+
+GRE-Bridge
+^^^^^^^^^^
+While normal GRE is for layer 3, GRE-Bridge is for layer 2. GRE-Bridge can encasulate Ethernet frames, thus it can be bridged with other interfaces to create datalink layer segments that span multiple remote sites.
+
+Layer 2 GRE example:
+
+.. code-block:: none
+
+ set interfaces bridge br0
+ set interfaces tunnel tun0 encapsulation gre-bridge
+ set interfaces tunnel tun0 local-ip 192.0.2.10
+ set interfaces tunnel tun0 remote-ip 192.0.2.20
+ set interfaces tunnel tun0 parameters ip bridge-group bridge br0
+ set interfaces ethernet eth1 bridge-group br0
+
+As you can see, the bridge-group option for tunnels is in a rather unusual place, different from all other interfaces.
+
+
Troubleshooting
^^^^^^^^^^^^^^^