From b8cf1837e9a270d5e9fb261d6ef1a14eb3bad0a4 Mon Sep 17 00:00:00 2001
From: Markus Hauschild <markus@moepman.eu>
Date: Thu, 19 Jul 2018 16:28:52 +0200
Subject: [PATCH] Fix too small ARP/ND cache

---
 roles/arp-cache/tasks/main.yml | 11 +++++++++++
 site.yml                       | 25 +++++++++++++------------
 2 files changed, 24 insertions(+), 12 deletions(-)
 create mode 100644 roles/arp-cache/tasks/main.yml

diff --git a/roles/arp-cache/tasks/main.yml b/roles/arp-cache/tasks/main.yml
new file mode 100644
index 0000000..de0336c
--- /dev/null
+++ b/roles/arp-cache/tasks/main.yml
@@ -0,0 +1,11 @@
+---
+
+- name: Configure ARP/ND cache
+  sysctl: name={{ item.key }} value={{ item.value }} state=present
+  with_items:
+  - { key: 'net.ipv4.neigh.default.gc_thresh1', value: 2048 }
+  - { key: 'net.ipv4.neigh.default.gc_thresh2', value: 4096 }
+  - { key: 'net.ipv4.neigh.default.gc_thresh3', value: 8192 }
+  - { key: 'net.ipv6.neigh.default.gc_thresh1', value: 2048 }
+  - { key: 'net.ipv6.neigh.default.gc_thresh2', value: 4096 }
+  - { key: 'net.ipv6.neigh.default.gc_thresh3', value: 8192 }
diff --git a/site.yml b/site.yml
index ba2dbea..eb476e3 100644
--- a/site.yml
+++ b/site.yml
@@ -11,18 +11,19 @@
 - name: Setup gateway servers
   hosts: [gw11.regensburg.freifunk.net, gw21.regensburg.freifunk.net, gw31.regensburg.freifunk.net]
   roles:
-   - gw-admin-ssh-keys
-   - batman
-   - bird
-   - fastd
-   - mesh-interfaces
-   - exit-ipv4
-   - dns
-   - radvd
-   - dhcpd
-   - respondd
-   - yanic
-   - web-gw
+  - gw-admin-ssh-keys
+  - arp-cache
+  - batman
+  - bird
+  - fastd
+  - mesh-interfaces
+  - exit-ipv4
+  - dns
+  - radvd
+  - dhcpd
+  - respondd
+  - yanic
+  - web-gw
 
 - name: Setup confluence server
   hosts: confluence.regensburg.freifunk.net