Wireless can't ping wireless (more info)

[Fred Smith]

On Thu, Jan 22, 2015 at 06:58:07PM -1000, Jim Lewis wrote:
> 
> >
> >  I just realized that my wireless computers can't ping each other.
> > Wireless to wired and vice versa is just fine. The IP addresses (DHCP)
> > are all on the same subnet. If I switch to wired the computer can then
> > ping a wired or wireless. The computers can all access the Internet at
> > any time (either wired or wireless). I did some research and have
> > determined the problem might be my router.
> >
> >   I use a LinkSys E3000 which I have had for a very long time. I checked
> > their site and looked at the Release Notes for firmware upgrades. No
> > mention of this issue and so I am hesitant to perform it (I did however
> > download the latest file). I got into their Live Chat and the guy said
> > since the unit is no longer in warranty I would have to pay to get
> > assistance. I thought about doing this, but he could not guarantee
> > success and the payment is not refundable. I thought that sucked and
> > told him so.
> >
> >  So, does anyone have any ideas about how I might solve this? I am going
> > to be rather surprised if the problem is not the router. If it matters
> > here is my hardware:
> >
> > Fedora 14 - wired desktop
> > Fedora 20 - wireless laptop
> > Fedora 21 - wireless laptop (or wired)
> > Fedora 21 - wireless laptop (or wired)
> > Ubuntu 12.04.2 LTS - wireless (practically unusable because of Gnome 3)
> >
> 
>   I just discovered something new: If I boot up one of my Fedora 21
> laptops and try to ping it from any computer (wired or wireless), it
> will fail with the same "Destination Host Unreachable" message. Note
> that I am using the correct IP as shown by ifconfig. This laptop can
> access the Internet just fine. Now here comes the good part: If I ping
> my wired computer from this laptop it succeeds, and if I now try to ping
> this laptop from the wired machine that now succeeds as well!  I have
> tried this a bunch of times with the same result. Note that a wired

Makes me think (a wild guess, more likely) of an ARP problem. though
I couldn't point at anything in particular.

Might be helpful to break out wireshark and look at the low-level
traffic.

> connection does not behave this way, I can ping it immediately. Also, I
> just tried this with my Fedora 20 system (wireless) and it does NOT
> fail, I can ping it immediately. So, assuming I haven't made some
> brilliant error (I only make really stupid ones) there is something not
> quite right in my Fedora 21 setups (yes, this is happening on both of
> them).
> 
>  I am using the Mate Compiz spin. Once the connection is made and can ping
> both ways it seems to stay that way without any further issues.
> 
>  I believe this also explains why wireless to wireless doesn't work. Since
> it can't ping in either direction I can't "jog" it into working.
> 
>  One more data point: This also occurs if I disable the interface and
> start it back up again. A reboot is not required to show the problem.
> 
> 
> 
> Jim Lewis
> 
> 
> 
> 
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