munin: Use hostnames in node definitions

munin/templates/munin-node.conf.erb

@@ -42,7 +42,7 @@ allow <%= "^%s$" % allow.gsub('.', '\.') %>
 <% end -%>
 
 # Which address to bind to;
-host <%= @ipaddress %>
+host *
 
 # And which port
 port 4949

munin/templates/munin.conf.erb

@@ -16,6 +16,9 @@ graph_strategy cgi
 cgiurl_graph /munin/cgi/munin-cgi-graph
 <% if @munin_tls == "true" -%>
 
+# Force munin-update to use IPv4 to workaround broken IPv6 support
+local_address <%= @ipaddress %>
+
 # Require TLS
 tls paranoid
 tls_verify_certificate yes