From f404922d6b83c19856f1fd970c5e88e0e5c61c9d Mon Sep 17 00:00:00 2001
From: Timotej Lazar <timotej.lazar@fri.uni-lj.si>
Date: Fri, 5 Apr 2024 09:26:06 +0200
Subject: [PATCH] proxmox: use L4 info for ECMP hashing

This should make VXLAN-encapsulated traffic multipath.
---
 roles/proxmox/files/sysctl.conf | 3 +++
 roles/proxmox/tasks/main.yml    | 5 +++++
 2 files changed, 8 insertions(+)
 create mode 100644 roles/proxmox/files/sysctl.conf

diff --git a/roles/proxmox/files/sysctl.conf b/roles/proxmox/files/sysctl.conf
new file mode 100644
index 0000000..855939b
--- /dev/null
+++ b/roles/proxmox/files/sysctl.conf
@@ -0,0 +1,3 @@
+# L4 (5-tuple) hashing for ECMP.
+net.ipv4.fib_multipath_hash_policy = 1
+net.ipv6.fib_multipath_hash_policy = 1
diff --git a/roles/proxmox/tasks/main.yml b/roles/proxmox/tasks/main.yml
index e2460ef..8fdc07d 100644
--- a/roles/proxmox/tasks/main.yml
+++ b/roles/proxmox/tasks/main.yml
@@ -28,6 +28,11 @@
     mode: 0644
   notify: reboot
 
+- name: Set up sysctls
+  copy:
+    dest: /etc/sysctl.d/local.conf
+    src: sysctl.conf
+
 - name: Set up interfaces
   template:
     dest: /etc/network/interfaces.d/real.intf