<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0cm;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";}
span.rynqvb
{mso-style-name:rynqvb;}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:Consolas;}
span.EmailStyle23
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;
mso-ligatures:none;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style></head><body lang=en-DE link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Hi Irene,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>You can adjust the linux source port range in </span><span style='mso-fareast-language:EN-US'>/proc/sys/net/ipv4/ip_local_port_range</span><span lang=EN-US style='mso-fareast-language:EN-US'> to be IANA compliant.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>“</span><span style='mso-fareast-language:EN-US'>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 /proc/sys/net/ipv4/ip_local_port_range.</span><span lang=EN-US style='mso-fareast-language:EN-US'>”<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>(from <a href="https://bird.network.cz/?get_doc&v=20&f=bird.html#toc6.3">https://bird.network.cz/?get_doc&v=20&f=bird.html#toc6.3</a>)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>HTH!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Johannes<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:12.0pt;color:black'>From: </span></b><span style='font-size:12.0pt;color:black'>Bird-users <bird-users-bounces@network.cz> on behalf of Irene Lalioti <irene.lalioti@restena.lu><br><b>Date: </b>Tuesday, 10. October 2023 at 11:20<br><b>To: </b>Maria Matějka <maria.matejka@nic.cz>, BIRD Users <bird-users@network.cz>, Marian Rychtecky <mr@nix.cz><br><b>Subject: </b>Question Verification regarding UDP port of BFD<o:p></o:p></span></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal>Hello dear Maria, Marian, and BIrd community,<br><br><br>I would like to ask you your feedback regarding an issue a member of us has indicated. That member has stumbled upon a non-RFC compliant BFD source port with result their CISCO router to drop the BFD packets.<br>Is it that Bird does not or does change the code to use a different source port? We would need to see how to workaround this issue.<br><br><span class=rynqvb><span lang=CS>Předem moc děkuji!!</span></span><span lang=CS><br><span class=rynqvb>Hesky den!</span><br><span class=rynqvb>Irene</span><br></span><br><br><br><br><o:p></o:p></p><pre>-- <o:p></o:p></pre><pre>Irene Lalioti<o:p></o:p></pre><pre>Network Engineer<o:p></o:p></pre><pre>Fondation RESTENA<o:p></o:p></pre><pre>2, avenue de l'Université<o:p></o:p></pre><pre>L-4365 Esch/Alzette<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Tel: +352 424409 1<o:p></o:p></pre><pre>Fax: +352 422473<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>This email may contain information for limited distribution only, please treat accordingly.<o:p></o:p></pre></div></body></html>