Re: [Xen-users] domU network has sleeping sickness

[Joshua West <jwest@xxxxxxxxxxxx>]

The symptoms you describe sound similar to whats found when there's a
MAC address conflict.  Make sure that the MAC addresses of your virtual
machines are completely unique and not used anywhere else in your network.

Marc Teichgraeber wrote:
> Hi all,
> 
> I have a strange network problem with some domU's on three XEN-Hosts.
> They are loosing their network connectivity. I do bridged networking.
>    * It happens randomly and could happen right after bootup of the domU
> or anytime later.
>    * The domU is not reachable from another host on the LAN.
>    * The domU is always reachable from the dom0 (ssh, ping).
>    * I can 'repair' the connection when attaching to the console and
> ping out from the domU. First nothings happens, then the machine gets
> back their network. (And thats also my momentary workaround, pinging all
> the time from the console)
>    * Pinging from another host at the same time helps too.
>    * It could be that I can ping continously from one host and another
> hosts gets only every 10th packet or so back.
>    * The interfaces could come back from their sleep by itself.
>    * When the networks has fallen asleep, ssh on the domU from another
> host hangs, it does not come back with "no route to host" or something.
> 
> I'm suspicious about the network controllers, they are the same on all
> hosts: "Intel Corporation 80003ES2LAN Gigabit Ethernet Controller
> (Copper)"(lspci) some kind of "Intel® PRO/1000 EB Network Connection
> with I/O Acceleration"(Intel website). I've tried the latest e1000
> driver from Intel but it does'nt helped.
> I've checked all MAC Adresses, they are unique, also the IP Adresses.
> 
> Any ideas are welcome :)
> 
> -------------------------------------------------------------------------
> "xm info" from host1,  openSUSE 10.2 (X86-64):
> 
> release                : 2.6.18.8-0.9-xen
> version                : #1 SMP Sun Feb 10 22:48:05 UTC 2008
> machine                : x86_64
> nr_cpus                : 4
> nr_nodes               : 1
> sockets_per_node       : 2
> cores_per_socket       : 2
> threads_per_core       : 1
> cpu_mhz                : 2327
> hw_caps                :
> bfebfbff:20100800:00000000:00000140:0004e3bd:00000000:00000001
> total_memory           : 32766
> free_memory            : 21607
> max_free_memory        : 21607
> max_para_memory        : 21603
> max_hvm_memory         : 21544
> xen_major              : 3
> xen_minor              : 0
> xen_extra              : .3_11774-23
> xen_caps               : xen-3.0-x86_64
> xen_pagesize           : 4096
> platform_params        : virt_start=0xffff800000000000
> xen_changeset          : 11774
> cc_compiler            : gcc version 4.1.2 20061115 (prerelease) (SUSE
> Linux)
> cc_compile_by          : abuild
> cc_compile_domain      : suse.de
> cc_compile_date        : Thu Jan 10 21:22:54 UTC 2008
> xend_config_format     : 2
> -------------------------------------------------------------------------
> "xm info" output on host2, openSUSE 10.3 (X86-64)
> 
> release                : 2.6.22.13-0.3-xen
> version                : #1 SMP 2007/11/19 15:02:58 UTC
> machine                : x86_64
> nr_cpus                : 8
> nr_nodes               : 1
> sockets_per_node       : 2
> cores_per_socket       : 4
> threads_per_core       : 1
> cpu_mhz                : 3000
> hw_caps                :
> bfebfbff:20100800:00000000:00000140:0004e3bd:00000000:00000001
> total_memory           : 16382
> free_memory            : 591
> max_free_memory        : 591
> max_para_memory        : 587
> max_hvm_memory         : 577
> xen_major              : 3
> xen_minor              : 1
> xen_extra              : .0_15042-51
> xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p
> xen_scheduler          : credit
> xen_pagesize           : 4096
> platform_params        : virt_start=0xffff800000000000
> xen_changeset          : 15042
> cc_compiler            : gcc version 4.2.1 (SUSE Linux)
> cc_compile_by          : abuild
> cc_compile_domain      : suse.de
> cc_compile_date        : Tue Sep 25 21:16:06 UTC 2007
> xend_config_format     : 4
> 


-- 
Joshua West
Systems Engineer
Brandeis University
http://www.brandeis.edu

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