<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML ><HEAD ><TITLE >Troubleshooting autodiscovery</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="The openMosix HOWTO" HREF="index.html"><LINK REL="UP" TITLE="Autodiscovery" HREF="autodiscovery.html"><LINK REL="PREVIOUS" TITLE="Compiling auto-discovering" HREF="x487.html"><LINK REL="NEXT" TITLE="PlumpOS" HREF="plumpos.html"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >The openMosix HOWTO: </TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="x487.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 5. Autodiscovery</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="plumpos.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="AEN492" ></A >5.3. Troubleshooting autodiscovery</H1 ><P >Sometimes however autodiscovery does not function as you would like, for example a node might not see multicast traffic from other nodes. This has occurred with some PCMCIA ethernet drivers. One solution is to place the interface in promiscuous and or multicast mode as detailed below: <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="PROGRAMLISTING" >Aug 31 20:45:58 localhost kernel: openMosix configuration changed: This is openMosix #98 (of 1 configured) Aug 31 20:45:58 localhost kernel: openMosix #98 is at IP address 10.0.0.98Aug 31 20:45:58 localhost omdiscd[1627]: Notified kernel to activate openMosix Aug 31 20:45:58 localhost kernel: Received an unauthorized information request from 10.0.0.99</PRE ></FONT ></TD ></TR ></TABLE > What you should to then is try to force your NIC into promiscuous and/ or multicast mode manually. <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="PROGRAMLISTING" >ifconfig ethx promisc or ifconfig ethx multicast </PRE ></FONT ></TD ></TR ></TABLE > You might also want to run <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="PROGRAMLISTING" >tcpdump -i eth0 ether multicast </PRE ></FONT ></TD ></TR ></TABLE > which will have the same effect but you will now also be able to see the packages yourself. </P ><P >On some Layer 3 switches you other configs might be required. An openMosix user found out that on his Switch Summit48Si (Extreme Networks) he had to run <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="PROGRAMLISTING" >disable ipmcforwarding (to deactivate the routing of multicast paquets) disable igmp snooping</PRE ></FONT ></TD ></TR ></TABLE > before he was the different omdiscd's were able to see eachother, other switches might require similar configs.</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="PROGRAMLISTING" >Aug 31 22:14:43 inspon omdiscd[1422]: Simulated notification to activate openMosix [root@inspon root]# showmap My Node-Id: 0x0063 Base Node-Id Address Count ------------ ---------------- ----- 0x0063 10.0.0.99 1 [root@inspon root]# /etc/init.d/openmosix status OpenMosix is currently disabled [root@inspon root]# </PRE ></FONT ></TD ></TR ></TABLE > If you see the <EM >simulated</EM > you have probably forgotten to put the <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="PROGRAMLISTING" >#define ALPHA</PRE ></FONT ></TD ></TR ></TABLE > in comment.</P ><P >I have also noticed that autodiscovery does not work with FireWire based network cards.</P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="x487.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="plumpos.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Compiling auto-discovering</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="autodiscovery.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >PlumpOS</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
