Hello, Further investigation has led us to believe the problem is related to the MIPv6 stack and the kernel, and not the UML itself, sorry for the mistake. The reason why the Virtual Machine is failing (we suppose) is the following:
1. the VM is using MIPv6 as a CN, a kernel patch from MIPL, and also SIP Express Router (SER) 2. when it received a packet too big (so that it need to be IP-fragmented), SER/MIPv6 fails, and sends a SIGTERM(15) 3. the VM catches the exception, and ends abruptly We have seen this by configuring an standalone machine, where the exception only lead SER to fail, but not the machine itself. So the only 'disturbance' caused by UML is that the exception makes it fail... Are we all right in this conclusion? Again, I asume that the rest of the problem has nothing to be with UML, so sorry for using the wrong list. Thanks, and best regards, Emilio -----Mensaje original----- De: Blaisorblade [mailto:[EMAIL PROTECTED] Enviado el: lunes, 20 de noviembre de 2006 20:12 Para: [email protected] CC: Emilio García Asunto: Re: [uml-user] Problem with UML+MIPv6 On Monday 20 November 2006 10:32, Emilio García wrote: > Dear all, > > We have been experiencing a severe problem with our Virtual Machines, > using UML. We simulate a complex IMS network, where several nodes > additionaly have MIPv6 functionality (kernel linux-2.6.16.27, MIPv6 2.0.2). > The problem arises as we try to send a particular message through one > of this MIPv6-enabled nodes: that Virtual Machine ends abruptly, and > its associated xterm window desappears instantly, while the rest of > the simulation stays up. > The particularity about this message is that it is very big. It is an > INVITE that exceeds the MTU of Ethernet (more than 1500 bytes). Since the ethernet driver has no jumbo frames support, until that is implemented (no plan exists currently, we need ) it should refuse to accept the packet (if it is sent with some raw ethernet socket) or use IP fragmentation. What does MIPV6 do? Is it some kind of IPv6 stack or what, sorry (I really need to know whether it sends frames at the Ethernet level)? > So the question is: do you know any limitation between UML/MIPv6 > regarding messages of big size? The host uses VLANs to interconnect > the Virtual Machines... Could there be any trouble with that? > > Thank you very much, > > Best regards, > > Emilio García -- Inform me of my mistakes, so I can add them to my list! Paolo Giarrusso, aka Blaisorblade http://www.user-mode-linux.org/~blaisorblade Chiacchiera con i tuoi amici in tempo reale! http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ User-mode-linux-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
