From dfa5ecf58cba7a9011fe8100b9a8ea09c385f29b Mon Sep 17 00:00:00 2001
From: Nico Schottelius <nico@nico-notebook.schottelius.org>
Date: Mon, 10 May 2021 13:56:10 +0200
Subject: [PATCH] multirouter graphs

---
 routing-multirouter-stateful-bad.dot  | 20 ++++++++++++++++++++
 routing-multirouter-stateful-good.dot | 19 +++++++++++++++++++
 routing-multirouter-stateful.dot      |  2 +-
 3 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 routing-multirouter-stateful-bad.dot
 create mode 100644 routing-multirouter-stateful-good.dot

diff --git a/routing-multirouter-stateful-bad.dot b/routing-multirouter-stateful-bad.dot
new file mode 100644
index 0000000..7e34720
--- /dev/null
+++ b/routing-multirouter-stateful-bad.dot
@@ -0,0 +1,20 @@
+digraph G {
+    node [ shape=box ]
+
+    upstreamrouter1 [ label="Upstream Router 1\nStateless routing" ];
+    upstreamrouter2 [ label="Upstream Router 2\nStateless routing" ];
+
+    router1 [ label="Internal Router 1\nStateful routing" ];
+    router2 [ label="Internal Router 2\nStateful routing" ];
+
+    servers [ label="Servers" ]
+    internet [ label="Internet" shape=oval ]
+
+    servers->router1 [ label="Use as default router" ]
+    router1->{upstreamrouter1,upstreamrouter2} [ label="Forward packet" ]
+    {upstreamrouter1,upstreamrouter2}->internet [ label="Forward packet" ]
+    internet->{upstreamrouter1,upstreamrouter2} [ label="Send answers" ]
+    {upstreamrouter1,upstreamrouter2}->router2 [ label="Return anwers from the Internet" ]
+    router2->servers [ label="Drop the answer, no state entry" ]
+
+}
diff --git a/routing-multirouter-stateful-good.dot b/routing-multirouter-stateful-good.dot
new file mode 100644
index 0000000..4ed0aec
--- /dev/null
+++ b/routing-multirouter-stateful-good.dot
@@ -0,0 +1,19 @@
+digraph G {
+    node [ shape=box ]
+
+    upstreamrouter1 [ label="Upstream Router 1\nStateless routing" ];
+    upstreamrouter2 [ label="Upstream Router 2\nStateless routing" ];
+
+    router1 [ label="Internal Router 1\nStateful routing" ];
+
+    servers [ label="Servers" ]
+    internet [ label="Internet" shape=oval ]
+
+    servers->router1 [ label="Use as default router" ]
+    router1->{upstreamrouter1,upstreamrouter2} [ label="Forward packet" ]
+    {upstreamrouter1,upstreamrouter2}->internet [ label="Forward packet" ]
+    internet->{upstreamrouter1,upstreamrouter2} [ label="Send answer" ]
+    {upstreamrouter1,upstreamrouter2}->router1 [ label="Return anwers from the Internet" ]
+    router1->servers [ label="Forward the answer" ]
+
+}
diff --git a/routing-multirouter-stateful.dot b/routing-multirouter-stateful.dot
index a1d14bb..098e862 100644
--- a/routing-multirouter-stateful.dot
+++ b/routing-multirouter-stateful.dot
@@ -15,7 +15,7 @@ digraph G {
     {router1,router2}->{upstreamrouter1,upstreamrouter2} [ label="Announce 2001:db8::/64\n via BGP\nUse as default router" ]
     {upstreamrouter1,upstreamrouter2}->internet [ label="Forward packets" ]
     internet->{upstreamrouter1,upstreamrouter2} [ label="Send answers" ]
-    {router1,router2}->{upstreamrouter1,upstreamrouter2} [ label="Return anwers from the Internet" ]
+    {upstreamrouter1,upstreamrouter2}->{router1,router2} [ label="Return anwers from the Internet" ]
     {router1,router2}->servers [ label="Forward the answer" ]
 
 }