Updated documentation

docs/markdown/interfaces.md

@@ -1136,6 +1136,12 @@ These can be used to control various aspects of interface behaviour.
 >   link or a remote TCP tunnel) solely to discover better local
 >   infrastructure, which then supersedes the bootstrap interface.
 >   
+> * The `recursive_prs` option allows you to enable recursive path
+>   discovery on an interface regardless of its configured interface
+>   mode. When this option is enabled, Reticulum will attempt to
+>   recursively discover paths for path requests received on this
+>   interface.
+>   
 
 ## Interface Modes
 
@@ -1211,6 +1217,15 @@ the default mode.
 >   public Transport Node available on the Internet, the interface
 >   connecting over the Internet should be set to `boundary` mode.
 >   
+> * The `internal` mode designates interfaces that belong to an
+>   network different from any marked as `boundary`. Announces from
+>   a `boundary` interface will not propagate to interfaces set as
+>   `internal`, but announces *will* propagate from `internal` *to*
+>   `boundary`. Devices on the `internal` side of the network will
+>   still be able to resolve paths to destinations across the boundary
+>   when needed, since recursive path requests are enabled for `internal`
+>   mode interfaces by default.
+>   
 
 For a table describing the impact of all modes on announce propagation,
 please see the [Announce Propagation Rules](understanding.md#understanding-announcepropagation) section.

docs/markdown/understanding.md

@@ -632,30 +632,55 @@ but excluding any interface access codes.
 
 The following table illustrates the rules for automatically propagating announces from one interface type to another, for all possible combinations. For the purpose of announce propagation, the *Full* and *Gateway* modes are identical.
 
-![image](graphics/if_mode_graph_b.png)
-
 See the [Interface Modes](interfaces.md#interfaces-modes) section for a conceptual overview of the different interface modes, and how they are configured.
 
+![image](graphics/if_mode_graph_b.png)
+
+Or, represented in table form:
+
+![image](graphics/if_mode_graph_c.png)
 <!-- (.. code-block:: text)
 Full ────── ✓ ──┐              ┌── ✓ ── Full
-AP ──────── ✓ ──┼───> Full >───┼── ✕ ── AP
-Boundary ── ✓ ──┤              ├── ✓ ── Boundary
+AP ──────── ✓ ──┤              ├── ✕ ── AP
+Boundary ── ✓ ──┼───> Full >───┼── ✓ ── Boundary
+Internal ── ✓ ──┤              ├── ✓ ── Internal
 Roaming ─── ✓ ──┘              └── ✓ ── Roaming
 
 Full ────── ✕ ──┐              ┌── ✓ ── Full
-AP ──────── ✕ ──┼────> AP >────┼── ✕ ── AP
-Boundary ── ✕ ──┤              ├── ✓ ── Boundary
+AP ──────── ✕ ──┤              ├── ✕ ── AP
+Boundary ── ✕ ──┼────> AP >────┼── ✓ ── Boundary
+Internal ── ✕ ──┤              ├── ✓ ── Internal
 Roaming ─── ✕ ──┘              └── ✓ ── Roaming
 
 Full ────── ✓ ──┐              ┌── ✓ ── Full
-AP ──────── ✓ ──┼─> Roaming >──┼── ✕ ── AP
-Boundary ── ✕ ──┤              ├── ✕ ── Boundary
+AP ──────── ✓ ──┤              ├── ✕ ── AP
+Boundary ── ✕ ──┼─> Roaming >──┼── ✕ ── Boundary
+Internal ── ✕ ──┤              ├── ✕ ── Internal
 Roaming ─── ✕ ──┘              └── ✕ ── Roaming
 
 Full ────── ✓ ──┐              ┌── ✓ ── Full
-AP ──────── ✓ ──┼─> Boundary >─┼── ✕ ── AP
-Boundary ── ✓ ──┤              ├── ✓ ── Boundary
-Roaming ─── ✕ ──┘              └── ✕ ── Roaming -->
+AP ──────── ✓ ──┤              ├── ✕ ── AP
+Boundary ── ✓ ──┼─> Boundary >─┼── ✓ ── Boundary
+Internal ── ✓ ──┤              ├── ✕ ── Internal
+Roaming ─── ✕ ──┘              └── ✕ ── Roaming
+
+Full ────── ✓ ──┐              ┌── ✓ ── Full
+AP ──────── ✓ ──┤              ├── ✕ ── AP
+Boundary ── ✕ ──┼─> Internal >─┼── ✓ ── Boundary
+Internal ── ✓ ──┤              ├── ✓ ── Internal
+Roaming ─── ✕ ──┘              └── ✕ ── Roaming
+
+          dest →   Full   AP   Boundary   Roaming    Gateway   Internal
+source ↓
+Full                ✓     ✕      ✓          ✓           ✓         ✓
+Gateway             ✓     ✕      ✓          ✓           ✓         ✓
+AP                  ✓     ✕      ✓          ✓           ✓         ✓
+Boundary            ✓     ✕      ✓          ✕           ✓         ✕
+Internal            ✓     ✕      ✓          ✕           ✓         ✓
+Roaming             ✓     ✕      ✕          ✕           ✓         ✕
+
+✓ Will rebroadcast announce
+✕ Will not rebroadcast announce -->
 
 ### Cryptographic Primitives