[mdlug] strange network issue

[Mat Enders]

When this occurs if you do ifconfig with no arguments do you see the device?

If no when issueing ifconfig -a do you see the device?

If both thes is no run lspci and does the device show?

If the answer to #1 is yes no need for number 2&3 move on.
If the answer to #1 is no then answer to #2 is yes probably a driver issue.
If answer to #1&2 is no and #3 is yes could be driver or a bad card.
If answer to all three is no then bad card replace or add new card.

While this is occurring if answer to #1 is yes could be a bad cable or
network port on switch.

When this occurs use ethtool to check for an active link.

If shows no active link try new cable if still no link try new port if no
link then I am stumped put a new card in it and move on.


On Sun, Nov 17, 2013 at 8:31 PM, Gmail-otakurider <otakurider at gmail.com>wrote:

> Networking question to the group.
>
> I have a Ubuntu Server 12.04 LTS running on a dell 530. Having a strange
> route to host not found issue when I do a cold restart of the system,
> that being I turn it off for a day or so then start it.   I can ping
> it's local hard coded IP fine but no other machines. It on my local
> network and has been working up to now. If I reboot it a few times or do
> a ifdown eth0, ifup eth0 a few time it will start working. I am on a
> netgear switch and also have a few other machines on it as well and that
> have no issues. I am not sure if its from an Ubuntu update, I keep the
> machine running for a week or so at a time so I have done a few updates.
> Looking at dmsg I don't see any problems that jump out at me. I am not
> running ipv6 just simple ipv4. I also have openvpn running but it has
> been working fine for months before this odd problem started. Any ideas
> or thoughts?
>
> Thanks
>
> Pat.
>
>
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>



-- 
Mathew E. Enders

"Where once Samba and Apache sold Linux to the world they are now just part
of the plumbing.  But that's OK, plumbers make good money."
--Jeremy Allison