[lug] home network question

Mon Dec 24 14:00:18 MST 2012

I suggest this approach because a flat network should be much easier
to troubleshoot by doing things like inspecting arp caches and the
DHCP lease database.

On Sun, Dec 23, 2012 at 8:03 AM, Davide Del Vento
<davide.del.vento at gmail.com> wrote:
> I see your point and agree, I should be doing this (I am not, at present).
> However how can this affect only wireless and not wired connections on
> the second router? I'd expect both having problems.
> Cheers,
> Davide
>
> On Sat, Dec 22, 2012 at 5:10 PM, John Hernandez <jph at jph.net> wrote:
>> Davide, this might have something to do with how the routers are
>> deployed.  How are they connected?
>>
>> In this situation, I usually disable DHCP on the second device in the
>> chain and uplink it using a LAN port.  The WAN port goes unused (no
>> NAT/routing) on the downstream device. This avoids double NAT and
>> creates a single layer-2 domain across both devices.
>>
>> On Fri, Dec 21, 2012 at 5:52 PM, Davide Del Vento
>> <davide.del.vento at gmail.com> wrote:
>>> Thanks to both!
>>>
>>> More data collected. The phone is Android 2.3.6
>>> A laptop cannot see the wireless network when the phone cannot, which
>>> I believe point strongly versus the problem.
>>>
>>> It did not look to have any grounding issue, in that connecting or
>>> disconnecting the desktop (grounded) did not change anything and the
>>> trick below (which did partially solve the problem) was performed on
>>> an ungrounded laptop, in the same grounding conditions in which it was
>>> failing.
>>>
>>> According to the router web interface the wireless was enabled. I
>>> played with many settings (including a few reboot of the box) without
>>> any success. The odd thing is that the web interface does not show the
>>> MAC address of the WLAN (let alone allowing me to change it). I then
>>> disabled (reboot) and reenabled (reboot) the WLAN et voila' -- it is
>>> now working. The odd thing still remains the same (can't see router
>>> MAC, I guess I can connect the laptop and find it), but the web
>>> interface does show the phone MAC address (?)
>>>
>>> I suspect the issue will reoccur, so if you have other ideas (even
>>> wild) please let me know.
>>>
>>> Happy Holidays,
>>> Davide
>>>
>>> On Tue, Dec 18, 2012 at 10:17 PM, F.L. Whiteley <techzone at greeleynet.com> wrote:
>>>> More data.
>>>>
>>>> I was troubleshooting an iPad wireless problem recently, perhaps if the
>>>> phone is iPhone it might apply also.  Apparently the iPads do not like
>>>> double-NAT WIFI connections, so setting up the router as an access point is
>>>> preferred.  Is that your setup?
>>>>
>>>> Slightly different, but also WIFI. I've done some local support on Skybeam
>>>> customers where they are on rural acreages with neighbors.  They call
>>>> Skybeam, no trouble found with their service or radios, but performance
>>>> remains terrible.  I show up, change the customer LAN addressing from the
>>>> default and it just flows.  Now, is it a WIFI radio/radio issue or slightly
>>>> upstream?  Some appear near enough, but others appear outside the range for
>>>> radio/radio trouble.  Though the former seems most likely, I have this
>>>> nagging feeling despite the MAC isolation that appears to be used on the
>>>> network.  I advised Skybeam support.  These customers typically buy only
>>>> from 2-3 brands of the popular WIFI routers from the big box stores, so the
>>>> default LAN addressing is common among 10-20 neighbors.  Plus they are
>>>> definitely sharing the same tower antenna.
>>>>
>>>> YMMV,
>>>>
>>>> Frank Whiteley
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: lug-bounces at lug.boulder.co.us [mailto:lug-bounces at lug.boulder.co.us]
>>>> On Behalf Of Davide Del Vento
>>>> Sent: Monday, December 17, 2012 8:06 AM
>>>> To: Boulder (Colorado) Linux Users Group -- General Mailing List
>>>> Subject: [lug] home network question
>>>>
>>>> Folks,
>>>> I have a TRENDnet TEW 432BRP with firmware v2.00.19 connected via ethernet
>>>> to another wireless+ethernet router. Then I have two PCs connected to the
>>>> TRENDnet via ethernet and my wife would like to use its wifi for her phone.
>>>>
>>>> The trouble is, if the PCs are off, the phone always says the wifi is out of
>>>> range, even when sitting in the same room where the router is.
>>>> When the PCs are on, it's 50-50 (sometimes the wifi is out of range,
>>>> sometimes is working). The PC always access the network fine.
>>>>
>>>> Do you have any idea of what's going on? I suspected something like power
>>>> save, but couldn't find anything. Neither did Google. Do I have a defective
>>>> unit, or is it anything else I could try? I'd be eager to try something
>>>> hacky, but e.g.
>>>> http://wiki.openwrt.org/toh/start#trendnet isn't supported.
>>>>
>>>> Even just suggestions about keywords to Google would be good.
>>>>
>>>> Thanks,
>>>> Davide
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