[GRLUG] Ubiquiti issues

[Benjamin Flanders]

Cleaning my e-mail up I found this thread where you all helped a lot.  I
want to thank you so much for that.

I don't remember letting you know the outcome.  It just so happens that the
AP's were hooked up to some cisco routers and these routers were setup to
only allow 10 ip addresses per port.  I changed this setting and all
wireless devices now have valid ip addresses.

Again, thank you all for the help.

Share and Enjoy <http://www.hhgproject.org/entries/shareandenjoy.html>
Ben

On Tue, Sep 9, 2014 at 4:17 PM, Adam Tauno Williams <awilliam at whitemice.org>
wrote:

> On Tue, 2014-09-09 at 15:52 -0400, Benjamin Flanders wrote:
> > Question:
> > What would cause a client to be randomly unable to access or ping a
> > certain server on the network, while other clients have no issue
> > pinging said server, nor does that client have an issue pinging other
> > servers.  It isn't just this laptop, I've witnessed this directly one
> > other time a few weeks ago.
>
> A bad switch, wigging out spanning-tree configuration, a bad switch,
> overlapping MAC#s on the network, a bad switch, or a switch whose table
> has overflowed [hard to believe these days].
> > Background:
> > Today I had a sales manager come to me saying that his internet was
> > going up and down all morning, but he has had a strong connection the
> > whole time(from the little icon in the system tray).  It was currently
> > down so went over there and found that I couldn't ping the dns server,
>
> Do you use managed switches?  Do you see errors of any kind?  Do they
> report issues to a trap collector [an NMS?]?  If you have modern managed
> switches they are likely trying very hard to tell you what the problem
> is.
> > Mmm, I thought, I have wireshark at my desk on the other side of the
> > office(as if I knew how to use it).  So I grabbed his laptop and went
> > to my office.  Alas, when I got to my desk the laptop was not having
> > any issues with pinging the dns server anymore.  I don't know if it
> > was crossing into another AP (reconnecting to network), or just that
> > it randomly started working.
>
> Do you see errors?  Whatever the Windows equivalent of "netstat -i" is.
>
> > Once I get the DHCP server on the linux box I'll truely see if my
> > issue stops being getting an IP lease and starts to becoming a DNS
> > issue.
>
> I'd wager it is neither.
> --
> Adam Tauno Williams <mailto:awilliam at whitemice.org> GPG D95ED383
> Systems Administrator, Python Developer, LPI / NCLA
>
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