From d96ec7f6e0d26546d9a27064fd13591618258894 Mon Sep 17 00:00:00 2001
From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Mon, 31 Mar 2014 18:51:16 +0200
Subject: [PATCH] Updates BFD documentation.

---
 doc/bird.sgml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/doc/bird.sgml b/doc/bird.sgml
index f991bad0..07e75588 100644
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -1378,6 +1378,11 @@ RFC 5882<htmlurl url="ftp://ftp.rfc-editor.org/in-notes/rfc5882.txt">.
 development, expect some rough edges and possible UI and configuration changes
 in the future. Also note that we currently support at most one protocol instance.
 
+<p>BFD packets are sent with a dynamic source port number. Linux systems use by
+default a bit different dynamic port range than the IANA approved one
+(49152-65535). If you experience problems with compatibility, please adjust
+<cf>/proc/sys/net/ipv4/ip_local_port_range</cf>
+
 <sect1>Configuration
 
 <p>BFD configuration consists mainly of multiple definitions of interfaces.