On Mon, 27 Jun 2016, moeller0 wrote:
Hi David,
On Jun 27, 2016, at 09:44 , David Lang wrote:
On Mon, 27 Jun 2016, Sebastian Moeller wrote:
On a wireless network, with 'normal' omnidirctional antennas, the signal drops
off with the square of the distance. So if you want to servi
en mu-mimo requires some client support.
David Lang
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lace as
the AP, the AP is going to hear signals that you don't.
Then consider the case where you and the other station are on opposite sides of
the AP at max range.
and then add cases where there is a wall between you and the other station, but
the AP can hear
uld be separated from the the BSSID's
"carrier/energy state" signal?
how do you solve the interference problem on this other band/radio? When you
have other APs in the area operating, you will have the same problem there.
David Lang
Bob
On Mon, Jun 27, 2016 at 12:40 PM, David
t on the 'coordination' channel.
I'm also not sure what good it would do, once a transmission has been stepped
on, it will need to be re-sent (I guess you would be able to re-send immediatly)
David Lang
Bob
On Mon, Jun 27, 2016 at 1:09 PM, David Lang wrote:
On Mon, 27 J
t does is impressive, given the amount
things have changed since it was designed, and the fact that backwards
compatibility has been maintained.
David Lang
Bob
On Mon, Jun 27, 2016 at 2:09 PM, David Lang wrote:
On Mon, 27 Jun 2016, Bob McMahon wrote:
packet size is smallest udp payload per a
nd needs to be triggered by an
outgoing message.
It's compiled into the kernel and on by default (I fight to turn it off for
Scale where I don't need to maintain state in the APs as they don't do any
firewalling)
David Lang
Similarly I'm unfamiliar with the state of ipv6 upnp
full
power/frequency range for your location.
upload faster than download is unusual, but interference can cause strange
issues.
Get the RF right before you worry about other things.
David Lang
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On Sun, 6 Nov 2016, James Cloos wrote:
"DL" == David Lang writes:
DL> My first question is if you have checked that you don't have other
DL> 5GHz users on the same channel in your area.
Yes, The Wifi Analyzer droid app (run on my fairly high end phablet)
shows onl
On Mon, 7 Nov 2016, James Cloos wrote:
"DL" == David Lang writes:
DL> I wonder if you are running into the problem with encryption and
DL> packet re-ordering that was solved a couple months ago, try disabling
DL> fq_codel or test without encryption to see if that's
On Mon, 5 Jun 2017, Richard Smith wrote:
My WNDR 3700v2 power supply is rated at 12V 2.5A which is a peak of 30W.
don't forget that this includes providing power out to the USB port as well.
yet another reason to measure things :-)
David L
There are two different issues here.
1. the last mile ISP plays games with the traffic for their own benefit (and
thir competitors detriment)
2. the government wants to spy on everybody
It's possible for the VPN tunnel providers to solve problem #1 without solving
problem #2
k
He does a good job of explaining these high provile vulnerabilities.
On Fri, 5 Jan 2018, Jonathan Morton wrote:
On 5 Jan, 2018, at 5:35 pm, dpr...@deepplum.com wrote:
Of course the "press" wants everyone to be superafraid, so if they can say "KVM is
affected" that causes the mob to start runn
On Thu, 6 Dec 2018, Dave Taht wrote:
Toke Høiland-Jørgensen writes:
Dave Taht writes:
https://github.com/gautamramk/FQ-PIE-for-Linux-Kernel/issues/2
With all the variants of fq+AQM, maybe decoupling the FQ part and the
AQM part would be worthwhile, instead of reimplementing it for each
v
well, it's
one guy at Marvell who does it in his spare time, nobody else has the info to be
able to work on it.
I'm working on the c2600 as my replacement for the wndr3800. I tried the C7 but
it's not really much better than the wndr38
On Sat, 2 Feb 2019, Mikael Abrahamsson wrote:
On Fri, 1 Feb 2019, David Lang wrote:
I had high hopes for these, but the driver development is not working well,
it's one guy at Marvell who does it in his spare time, nobody else has the
info to be able to work on it.
It's the w
w your UDP application
have a chance to operate.
David Lang
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This is using the compute module, that does not have any on-board ports
so it's 2 Gig ports total
David Lang
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ng for a specific company (avoiding even the appearance
of bias) but it's morphed to present at least the appearance of special access.
David Lang
On Tue, 30 Mar 2021, David P. Reed wrote:
Date: Tue, 30 Mar 2021 21:23:50 -0400 (EDT)
From: David P. Reed
To: Theodore Ts'o
Cc: Make-Wifi
)
My sister is in rural Michigan and the best she can get is 2M (until starlink),
with 3 kids doing remote learning and her teaching. Not great, but they survived
2020 with it.
yes, more is nice, but saying that 100Mb is not enough is ignoring the huge
population that isn't getting 1/10
I have seen some performance tests that do explicit DNS timing tests separate
from other throughput/latency tests.
Since DNS uses UDP (even if it then falls back to TCP in some cases), UDP
performance (and especially probability of loss at congested links) is very
important.
David Lang
On
station B cannot hear station A
3. station A can hear that station B is transmitting, but not with a strong
enough signal to decode the signal (yes in theory you can work around
interference, but in practice interference is still a real thing)
David Lang
transmitting at much lower
power levels than it cn decode the signal.
David Lang
On Mon, 2 Aug 2021, Bob McMahon wrote:
On Mon, Aug 2, 2021 at 4:16 PM David Lang wrote:
If you are going to setup a test environment for wifi, you need to include
the
ability to make a fe cases that only happen with RF
are corner cases.
you don't need to include them in every test, but you need to have a way to
configure your lab to include them before you consider any settings/algorithm
ready to try in the wild.
David Lang
On Mon, 2 Aug 2021, Bob McMahon wrote:
We find four nodes, a primary BSS and an ad
djust it's receive
sensitivity.
David Lang
On Mon, 2 Aug 2021, Bob McMahon wrote:
Date: Mon, 2 Aug 2021 20:23:06 -0700
From: Bob McMahon
To: David Lang
Cc: Ben Greear ,
Luca Muscariello ,
Cake List ,
Make-Wifi-fast ,
Leonard Kleinrock , starl...@lists.bufferbloat.n
I agree that we don't want to make perfect the enemy of better.
A lot of the issues I'm calling out can be simulated/enhanced with different
power levels.
over wifi distances, I don't think time delays are going to be noticable (we're
talking 10s to low 100s of feet, not
nding out money, SpaceX is foolish not to apply for it.
David Lang
On Tue, 10 Aug 2021, Jeremy Austin wrote:
Date: Tue, 10 Aug 2021 12:33:11 -0800
From: Jeremy Austin
To: dick...@alum.mit.edu
Cc: Cake List ,
Make-Wifi-fast ,
Bob McMahon , starl...@lists.bufferbloat.net,
On Mon, 20 Sep 2021, Valdis Klētnieks wrote:
On Sun, 19 Sep 2021 18:21:56 -0700, Dave Taht said:
what actually happens during a web page load,
I'm pretty sure that nobody actually understands that anymore, in any
more than handwaving levels.
This is my favorite interview question, it's amaz
with 802.11ac, the difference between uplink and downlink is that the AP can
transmit to multiple users at the same time (multiple signals spacially
multiplexed), but the users transmit back one at a time.
David Lang
On Wed, 1 Dec 2021, David P. Reed wrote:
What's the difference be
itted individually,
that's about one packet (insert hand waving about scheduling delays, etc). but
with wifi where you can transmit multiple packets in one airtime slot, you need
enough buffer to handle the entire burst.
David Lang
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On Thu, 2 Dec 2021, Toke Høiland-Jørgensen wrote:
"Valdis Klētnieks" writes:
On Wed, 01 Dec 2021 13:09:46 -0800, David Lang said:
with wifi where you can transmit multiple packets in one airtime slot, you need
enough buffer to handle the entire burst.
OK, I'll bite... r
another valuable featur of fiber for home use is that fiber can't contribute to
ground loops the way that copper cables can.
and for the paranoid (like me :-) ) fiber also means that any electrical
disaster that happens to one end won't propgate through and fry other equipment
Davi
Playing Devil's advocate here.
Why do you need IPV6 for HAM use (other than the fact that it's new). There
aren't enough users to exhaust the IPv4 address space, and the packets are
larger so they take more airtime.
David Lang AG6AH
On Fri, 23 Nov 2012, dpr...@reed.com wro
On Tue, 27 Nov 2012, Jim Gettys wrote:
2) "fairness" is not necessarily what we ultimately want at all; you'd
really like to penalize those who induce congestion the most. But we don't
currently have a solution (though Bob Briscoe at BT thinks he does, and is
seeing if he can get it out from un
both among the best price/performance and with device
hacking supported. I haven't looked into the chipsets (I just recieved my Nexus
10)
David Lang
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even called Netgear in my research, and while they are completely out of
stock, they do not show the 3800 as being end of life yet, so this could be a
temporary gap.
David Lang
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cking with kernel
compile options.
If someone is willing to coach me through the process, I'd be happy to do the
experimentation.
David Lang
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On Sun, 23 Dec 2012, Dave Taht wrote:
On Sun, Dec 23, 2012 at 2:27 AM, David Lang wrote:
On Thu, 20 Dec 2012, Richard Brown wrote:
The wndr3700v4 is out, and appears to be a good hardware upgrade from
the 3800 series, but it's not supported by openwrt yet.
I took a look at their GPL s
I'm actually looking for low power devices, I need to put a lot of them in a
small area, so I'll be turning the power down about as far as it will go.
I'll look over their devices
David Lang
On Sun, 23 Dec 2012, Outback Dingo wrote:
Ubiquiti has quite a list of products tha
In looking at their products, they seem to have almost nothing that's dual band,
am I missing something?
David Lang
On Sun, 23 Dec 2012, Dave Taht wrote:
I wouldn't mind adding explicit support for ubiquity's in-home pro
On Sun, 23 Dec 2012, Dave Taht wrote:
On Sun, Dec 23, 2012 at 11:14 AM, David Lang wrote:
In looking at their products, they seem to have almost nothing that's dual
band, am I missing something?
Nope. I went single channel for the yurtlab backbone in part because I
wanted "har
still working on this, but openwrt has gained support for the WNDR4300, and
reports are that it appears that it's the same board as the WNDR3700v4. The 4300
is selling for ~$130 so it's a viable option, even if the 3700v4 falls through.
David Lang
On Sun, 23 Dec 2012, Dave Taht w
be
untagged on that port
As an example, here is the config of the 3800 I'm using right now
remember that the logical number of the switch ports is backwards from the
physical number (I like to use ports 1/4 on one vlan and 2/3 on a different one
so that I don't have to keep track)
Let
I found that there are several vendors selling through Amazon who have noticable
quantities (30+) of the factory refurbished 3800 routers, selling for around $80
each.
As the supplies are drying up rapidly, anyone wanting one should move quickly.
David Lang
On Sat, 19 Jan 2013, Dave Taht wrote:
https://srv1.openwireless.org/pipermail/tech/2012-December/000332.html
I haven't the foggiest idea what this traffic would look like. Is it even
possible to induce bufferbloat through tor?
with your packets bouncing through so many systems there are sure
depending on your hardware, you may be seeing bogus checksums in outbound
packets, but the packets on the wire have valid checksums because the hardware
computes the checksums and sets them.
I know I've run into this one before when doing load testing.
David Lang
On Mon, 28 Jan 2013, R
On Mon, 4 Feb 2013, Dave Taht wrote:
I think there is also a market need for something that can be an analysis
box/home router that can also do captures at typical rates in the home
(20-30Mbit), but that's still just above what a wndr3800 can do when last I
tried. (it's mostly bound by the usb i
you have vlans disabled in this config "option enable_vlan 0"
if you want to use vlans > 15 you need "option enable_vlan4k 1" as well
David Lang
On Wed, 20 Feb 2013, Maciej Soltysiak wrote:
Date: Wed, 20 Feb 2013 20:17:19 +0100
From: Maciej Soltysiak
To: William Kat
t. I've seen reports of
people getting it to run from an initramfs, but this means that no settings can
be preserved across reboot.
If you've seen anything different, I'd be very interested to hear about it (I
picked up a 3700v4 and a couple 4300's for testing)
David
e GPL source for the kernel available from Netgear, I'm a
little puzzled that we are having to reverse engineer this instead of working
from the source.
Even if the first version was little more than a cut-n-paste of the netgear
butchered driver until people have time to analyse it fully.
Da
well, DeLorm and other map companies have had Serial/USB/Bluetooth GPS receivers
available for a long time.
David Lang
probably not quite what you were thinking of, but funt
On Tue, 22 Oct 2013, Richard E. Brown wrote:
On Oct 22, 2013, at 7:59 AM, Toke Høiland-Jørgensen wrote:
A way to
He will be missed.
As a practical question, what is going to happen to all of these lists, etc that
he has been hosting?
David Lang
On Tue, 1 Apr 2025, Frantisek Borsik via Bloat wrote:
Date: Tue, 1 Apr 2025 19:27:36 +0200
From: Frantisek Borsik via Bloat
Reply-To: Frantisek Borsik
To
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