Learning, updated again

1 files changed, 10 insertions, 1 deletions

diff --git a/_posts/2024-03-17-further-learnings-from-running-my-as.md b/_posts/2024-03-17-further-learnings-from-running-my-as.md
index 172168e..494262b 100644
--- a/_posts/2024-03-17-further-learnings-from-running-my-as.md
+++ b/_posts/2024-03-17-further-learnings-from-running-my-as.md
@@ -2,7 +2,7 @@
 layout: post
 title: Further learnings from running my AS
 date: 2024-03-17 14:42 +0100
-last_modified_at: 2024-06-26 19:08 +02:00
+last_modified_at: 2024-07-08 20:17 +02:00
 lang: en
 categories: ["tech"]
 ---
@@ -114,3 +114,12 @@ Futher info:
   Instead, I need to add a default blackhole.
   (The filtered routes will not be in my routing table, and if I don't want to route
   to them, I need to prevent the kernel from using the default upstream route).
+
+**Update 2024-07-08**
+
+- Another oops! I just realized I also have to export *my prefix* as unreachable
+  into the kernel! Otherwise, due to the way I configured the routing in Linux
+  (`ip rule add ... from <myprefix> table xxx`), when a package arrives from
+  `eth0` which addresses a host that is not present in my AS, the default route
+  will be taken. And the gateway will throw the packet back at me. And I will
+  throw it back an the gateway. And so on.