X-Git-Url: https://git.openstreetmap.org./chef.git/blobdiff_plain/07074011fa21aef90a1c7cacb177418aac78739b..76212535d5c3bd8a789a1c8e1fe237710b169e59:/roles/ucl.rb

diff --git a/roles/ucl.rb b/roles/ucl.rb
index 7715e629a..eb3dfd1cd 100644
--- a/roles/ucl.rb
+++ b/roles/ucl.rb
@@ -2,11 +2,6 @@ name "ucl"
 description "Role applied to all servers at UCL"
 
 default_attributes(
-  :chef => {
-    :client => {
-      :version => "13.6.4"
-    }
-  },
   :location => "Slough, England",
   :networking => {
     :roles => {
@@ -24,6 +19,15 @@ default_attributes(
         }
       }
     }
+  },
+  :sysctl => {
+    :blackhole => {
+      :comment => "Force TCP level MTU probing because of known ICMP blackhole at UCL",
+      :parameters => {
+        "net.ipv4.tcp_mtu_probing" => "2",
+        "net.ipv4.tcp_base_mss" => "1024"
+      }
+    }
   }
 )