Total Networking Failure after upgrade to 12.04LTS

[Toshi Esumi]

By the way, man page of tcpdump says below about "dropped by kernel":
   packets ``dropped by kernel'' (this is  the  number  of packets
   that  were dropped, due to a lack of buffer space, by the packet
   capture mechanism in the OS on which tcpdump is running, if  the
   OS  reports that information to applications; if not, it will be
   reported as 0).

Probably no relation to the network problem.

Toshi
On Sat, 2013-07-27 at 21:36 -0700, Toshi Esumi wrote:
> One thing you might want to try before taking the server down is to run
> wireshark or something on one of local devices(10.10.x.y) [or set up a
> set of access-lists(if cisco) at the GW device(10.10.0.1)] and ping it
> from the server in question, so that you can determine if the packets
> are leaving the server/NIC or not. If you see those are arriving and the
> pinged device is responding normally, you can probably rule out NIC
> hardware issues.
> 
> Toshi
> On Sat, 2013-07-27 at 15:30 +0100, Liam Proven wrote:
> > On 27 July 2013 15:30, Nathan Mace <nathan4linux at gmail.com> wrote:
> > > Apologies if this goes twice, I think my last message got "ate" somewhere
> > > along the way.
> > >
> > > Can you take the server down and boot to a 12.04 live CD?  If networking
> > > works there, that would rule out a coincidental hardware failure and a
> > > driver issue with 12.04.  It doesn't sound like it is online at the moment
> > > so perhaps you can do that?
> > 
> > Concur. This would be my first troubleshooting step, too.
> > 
> > 
> > 
> > -- 
> > Liam Proven • Profile: http://lproven.livejournal.com/profile
> > Email: lproven at cix.co.uk • GMail/G+/Twitter/Flickr/Facebook: lproven
> > MSN: lproven at hotmail.com • Skype/AIM/Yahoo/LinkedIn: liamproven
> > Tel: +44 20-8685-0498 • Cell: +44 7939-087884
> > 
> 
> 
>