w********1
发帖数: 3492 | 1 Tue, 03 Jul 2012 08:17:07 PDT
With Apple opting not to release updated iMac models at its Worldwide
Developers Conference last month, there has been considerable debate over
the timing of the next update. Several of the hardware pieces such as Ivy
Bridge processors are already available to support an update, and with the
last update having occurred 427 days ago the time seems ripe for new models.
But one wild card has been the issue of Retina displays and whether they
will be included in the ne... 阅读全帖 |
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w********1
发帖数: 3492 | 2 Tue, 10 Jul 2012 09:21:45 PDT
Just before last month's Worldwide Developers Conference (WWDC), KGI
Securities analyst Ming-Chi Kuo correctly predicted that Apple's MacBook Pro
with Retina display would appear alongside the standard MacBook Pro instead
of as a direct replacement, also accurately claiming that only the 15-inch
Retina MacBook Pro would be making an appearance while a 13-inch model
remained in the works.
At the time, Kuo believed that Apple could have the 13-inch version ready by
Au... 阅读全帖 |
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c********g
发帖数: 1173 | 3 http://www.businessinsider.com/apple-macbook-pro-retina-13-inch
Apple is prepared to announce a lot more than just a new iPhone this week,
according to Aaron Lee and Joseph Tsai at DigiTimes.
Citing upstream supply chain sources, Tsai and Lee report Apple has begun
mass shipping of new iMacs, as well as 13-inch MacBook Pros with retina
displays. Retina display is Apple-speak for super high resolution screens.
This isn't the first time we've heard about these products. At the end of
August we hea... 阅读全帖 |
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g******d
发帖数: 157 | 4 Hi:
I found out that our local cable company
has "business class" cable internet access.
That service is designed for small business.
The upstream and downloading speed are both
1000kbps, and one to four static IP address.
I am thinking of using that to build a website
at home, clustering some linux machine together
to improve performance. The problem is,
I have no idea what kind of throughput the
1Mbps can provide. Will it good enough
for a small online business?
Thanks! |
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h**j
发帖数: 27 | 5
Of course, your connection is close to T1. if it's not
satisfied, then your business is not small.
(are u sure your results? soon or late, your cable
company will cut upstream down, or maybe block some
ports like 80) |
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Z****e
发帖数: 2999 | 6 what's ur internet service?
under ideal situation, it's still bounded by your upstream speed which is
normally much lower than your downstream
10 |
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t*******d
发帖数: 1186 | 7 sorry, let me rephrase my question. What I am asking, is the upstream speed.
ISPs 有不同package, 相应的价钱，upload speed, download speed也不同。如何计算
， 来选择不同的package呢？
thanks |
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t*******d
发帖数: 1530 | 8 这要看你的server内容和访问数量了。如果只是提供文本内容及少量图片，那upstream
bandwidth should not be a problem for normal website. a 500 kbps upsteam is
ennough for even 1000 unique visitor a day. however, if your website is
mainly serving tons of pics and file downloads, 10M bps wont be enough.
so start with user testing, see how many user will come in a day, how many
simultaneous users in peak time, how long each session will last, how many
total downloads in one session...
speed. |
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t*******d
发帖数: 1186 | 9 谢谢你的定性分析。
定量如何计算或预估呢？
upstream
is |
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z**r
发帖数: 17771 | 10 可是p2p要share的主要是upstream bandwidth，人们尤其是普通的用户，主要是使用do
wnstream。
p2p based voice比如skype已经取得了巨大的成功，对于传统的voip形成了很大的冲击
，voice何video在某些方面还是有共同之处，那么p2p based video会不会克隆skype这
样的成功呢？
当然，skype是通话，不是mp3等具有版权的流媒体，video在通话方面是一个辅助功能，
人们主要看节目或者interactive的应用，这些都是有版权的。 |
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z**r
发帖数: 17771 | 11 verizon FiOS stands for Fiber Internet Optical Network, which is Verizon's
next generation access network based on FTTP using BPON, with downstream at
622mbps and upstream 155mbps shared by a 32-line optical splitter. That means,
FiOS is pretty much like Cable service with higher quality (hopefully).
Each customer guarrantees up to 30mbps downstream, there is a little trick
here, which is, if you subscribe the 30mbps service and VoD at the same time,
VoD would grab 3.75mbps, then you can have an |
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z**r
发帖数: 17771 | 12 比较新的soho router都可以给upstream做一些qos/cos的简单东西。你看看你的d-link
可不可以
link |
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z**r
发帖数: 17771 | 13 or for $10 more, enjoy our top-speed connections of 8Mbps(768 Kbps).
刚搬了家，明天就订这个。384kbps upstream泰不爽了 |
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z**r
发帖数: 17771 | 14 or for $10 more, enjoy our top-speed connections of 8Mbps(768 Kbps).
刚搬了家，明天就订这个。384kbps upstream泰不爽了 |
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z**r
发帖数: 17771 | 15 刚刚升级了，show off一下。comcast cable
downstream 16Mbps, upstream 1Mbps，不过还是不能比光纤到户的，比如Verizon
FiOS |
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c**t
发帖数: 2744 | 16 thanks.. if upstream increased, then IP Phone might be better.
1m |
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z**r
发帖数: 17771 | 17 1. some can do very limited upstream bandwidth control, I hacked my linksys
router before, installed dd-wrt image, worked pretty stable |
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z**r
发帖数: 17771 | 18 I think what you said is true for MPLS VPN label, but I am more talking
about the pure MPLS. My point is, currently most Internet routers especialy
the edge routers have the full Internet knowledge, and these routers are
pretty much all MPLS enabled. Tho the label is locally significant, the
router does need to assign a label to one FIB/RIB item and propagate it to
the upstream router.
I don't worry about the P/core routers coz they don't have to build up the
full Internet table.
to
MPLS |
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S******n
发帖数: 617 | 19 Usually the upstream is the problem. How much UP do you have?
Or maybe you encountered network congestions. Try another time? |
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s*****g
发帖数: 1055 | 20 Well, we are not cloud provider, cloud providers are taking our business
away.Network jobs are shrinking, consolidating and shifting upstream. ;-( |
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s*****g
发帖数: 1055 | 21 BFD detects a next next hop link failure? how? what's BFD's application
protocol in this case?
MPLS can use RSVP PATH error message to notify upstream (PLR) to create a
repair session when failure happens in next next hop, but IP does not have
similar mechanism. |
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s*****g
发帖数: 1055 | 22 The same problem exists between IGP and BGP, what was the solution for that?
It makes a difference but the most vendors implement ordered control with
downstream unsolicited. i.e, a LSR only advertises a label for a FEC (
usually /32 loopbacks by default but other FECs can be injected by
configuration) upstream when a FEC is egress or when it has a mapping for
that FEC. |
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s*****g
发帖数: 1055 | 23 Is this not a simple MPLS-VPN hub-spoke configuration? or if you are
concerned by VRF configuration scalability, use scalable MPLS-VPN hub-spoke
configuration by using upstream/downstream VRFs? |
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s*****g
发帖数: 1055 | 24 The first scenario is BGP shortcut, the second one is ospf shortcut, totally
irrelevant to each other. Yes, A will take physical links unless TE tunnel
is
announced to IGP, and this TE tunnel won' t be usable/visible by A's
upstreams unless forwarding adjencency is configured in which case bi-
directional TE is needed to keep IGP link-state database consistent.
/html/mpls-config9.html |
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n**********l
发帖数: 271 | 25 Thanks.
I was assuming peering at multiple locations so iBGP is involved.
If the customer only gets a default route, why use BGP? There are a lot of (
cheaper) ways to do outbound load balance via multiple WAN links.
For some reason my ISP has been pointing default at AS3549 (Level3) for the
past few months... All outbound traffic goes to AS3549 while inbound traffic
arrive via different peers (AS3549, AS6939 etc.) The first hop/last hop is
different from bidirectional traceroute which does conf... 阅读全帖 |
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n**********l
发帖数: 271 | 26 Thanks. I was thinking about some script to monitor link status and add/
remove the static route for the backup circuit interface (does not apply
because no control over upstream router).
Does it cause BGP restart? Won't the delay cause noticeable packet loss(
especially for 10G/40G links)? |
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n**********l
发帖数: 271 | 27
这个需要在upstream route上面也设置administrative distance的...这个CDN的
interview搞得我完全糊涂了.... |
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n**********l
发帖数: 271 | 28 一个interview BGP diagram里面sites之间没有link, 直接连upstream
我就看得莫名其妙的了....估计答的大都错了.... |
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n**********l
发帖数: 271 | 29 correct me if I am wrong, geoip is in US is far less reliable than it is in
China...
in many cases it probably points to your ISP's upstream (e.g. Level 3
Colorado)... |
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m********d
发帖数: 188 | 30 好久没看到有意思的东西了，终于看到了一个，谢谢superdmv。
有几个细节想请教superdmv。问问题之前先贡献点儿我的认识。以前没关注过OCA，今
天看到这个后花了点时间学习了下，真的象superdmv说的那样：“这个CDN看上去做起
来很简单，当然这帮netflix的家伙也是很厉害，做了一个非常简单而且实用的方案，
就把internet上1/3的traffic给扛下来了”。我看到的“很简单，很厉害”的地方是一
个全新的CDN方法。传统CDN的核心问题有两个：geo-intellegence database and DNS
。OCA解决了或者说绕过了这两个问题。geo-intellegence database由OCA收到的ISP路
由直接生成；不用akamai式的DNS（基于用户DSN server IP的分布式DNS重定向），直
接查由OCA收到的ISP路由直接生成的geo-intellegence database定位到具体OCA，OCA
peering with transit IPS as catch-all。
开始问问题 :)
1. 能解释下这个tier具体是什么意... 阅读全帖 |
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s******v
发帖数: 4495 | 31 1. 能解释下这个tier具体是什么意思吗？
3）multiple-tier arch:
3.1) Headend, 1(6?) OCA - 80%;
3.2) Small Aggr. 8 OCA - 95%
3.3) Large Aggr. 24 OCA - 100%
你可以看他的slides，意思是多少个OCA能cover多少% traffic，
2. 为什么需要260*10G路由器？我的理解一个cluster(in Internet Exchange,
connecting with peering/transit ISP)有5个rack，每个10*OCA=50*10G port，假设
upstream:downstream 1:2 (5Gbps/OCA），+ 25*10G peering/transit port，= 75*
10G。
这个我也记不清了，好像是20 HDD OCA : 2x10G, 30 SSD OCA 3x10G, 因为bus
limitation还有硬盘IO, 每个是2-3 x 10G，没有oversubscription，所以是130 x 2 =
260
... 阅读全帖 |
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m********d
发帖数: 188 | 32 smart. isp owns the router, so it can hold ibgp route plus *.2906$ route. it
doesn't matter send 0/0 to oca or oca set default gw to router, off-net
traffic except traffic to AS2906 will be dropped on upstream router, which
means this route is dedicated to oca. so isp has to pitch in bw/power/space/
router.
real threat to Akamai/llnw/l3 is aws/azure, not home-grown cdn from fb/goog/
Netflix/etc. anyway it's hard for them to get biz from them, haha. biz for
Akamai/llnw/l3 is still from small fish... 阅读全帖 |
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b***p
发帖数: 700 | 33 【 以下文字转载自 PDA 讨论区 】
发信人: pathdream (求包养), 信区: PDA
标 题: netflix太强大了 整个控制internet速度
发信站: BBS 未名空间站 (Sun Nov 2 23:47:20 2014, 美东)
New Study From M-Lab Sheds Light On Widespread Harm Caused By Netflix
Routing Decisions
On Tuesday, M-Lab released a new study on the impact of network
interconnection on consumer Internet performance. The report entitled “ISP
Interconnection and its Impact on Consumer Internet Performance“, details
findings based on the speed test results collected by its test servers... 阅读全帖 |
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r***o
发帖数: 1526 | 34 我的router是WRT54G 刷了DD-WRT,
两台desktop, Dell Dimension 9100和C521,都设成Wake On Lan
从外边要用的时候用ssh连到router,用router上的wol命令启动机器
再连remote desktop.
装的是ｓｅｒｖｅｒ 2003, 这样可以用多个remote desktop,
从外边连的时候不影响家里人同时用
ISP是Verizon FIOS, best isp ever used. 5M downstream, 2M upstream
用remote desktop很爽
WHR- |
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a9
发帖数: 21638 | 35 下电影当然至少要下载1080p了。
我估计你是没怎么bt过？基本上跑极速没问题。
自己host server还是算了吧，upstream太低。
下载ftp更没必要这么高带宽了，哪个host会给你提供50M、100M的带宽让你ftp?
)。
下载 |
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c**i
发帖数: 6973 | 36 Thanks a lot. That is what I learned, particularly about "module." And taht
is why Kingston a year ago tried to join Taiwan Memory Company (TMC)
sponsored by the Taiwanese government, to get hold of upstream (making
memory chips, that is).
But does memory module mean assembly? Why is state-of-the-art equipment
needed? Can't assembly be accomplished with human labor, as in toys? |
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z**r
发帖数: 17771 | 37 这些1gbps, 100mbps or 54mbps都是接口速度，跟你internet access speed两码事儿
，你买的什么服务，服务条款里有你的downstream/upstream，那个才是你真正的瓶颈 |
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G*******n
发帖数: 3144 | 38
What's in the Box
Monitor with stand
Power Cable
DVI Cable
VGA Cable (attached to the monitor)
Drivers and Documentation media
USB upstream cable
Quick Setup Guide
Safety Information
找着了 .. 日 还得自己买线啊 |
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l*****i
发帖数: 234 | 39 屏幕右下有10厘长的裂纹
能不能把屏幕去掉，只剩主机，装个xbmc放在电视下？
这个上网本是最早一批，8g ssd的硬盘，以前就装了pptv/upstream
/qqlive三个软件 |
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e**o
发帖数: 5509 | 40 DSL UP
Internet Connection UP
Downstream Rate 3002 Kbps
Upstream Rate 511 Kbps
Internet IP Address 108.67.152.143
Internet Gateway Address 108.67.152.1
DNS Servers 68.94.156.1 dnsr1.sbcglobal.net
68.94.157.1 dnsr2.sbcglobal.net
Modem Information
Modem Name Motorola
Model 2210-02
Serial Number 127913029695472
Software Version 7.8.7r9
MAC Address 74:56:12:b2:77:f1
First Use Date 2011/04/27 19:35:29 GMT
Local Network
Modem IP Add... 阅读全帖 |
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c**i
发帖数: 6973 | 41 (1) Yenting Chen and Joseph Tsai, iPhone 5 and iPad 3 Upstream Suppliers
Begin to Prepare Materials. DigiTimes (Taipei), July 1, 2011
http://www.digitimes.com/news/a20110701PD216.html
(Apple is expected to make announcement in September and starts seeling a
month later)
Note:
(a) Simplo Technology Co, Ltd 新普科技
http://www.simplo.com.tw
(formed in 1992; 致力於筆記型電腦電池模組)
(b) Dynapack International Technology Corporation 順達科技股份有限公司 (
established in 1998)
http://www.dynapack.com.tw/
(c) TPK Holding Co, ... 阅读全帖 |
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g****n
发帖数: 3370 | 42 这个问题已经让我纠结了两个月了，实在无计可施了。请教一下各位看看有什么建议没
有。
先谢过了！
我用的DSL上网，dry-loop, modem工作在bridge状态，router负责PPPoE及其他。
用了几年好好的，但从两个月前开始，出现断线情况。症状是，突然没有征兆
的PPPoE断开，但modem的DSL灯还亮着，看它的状态依然是sync的，看log也看不出
有什么不正常。但看router的log，断线时出现这样的信息：
LCP appears to be disconnected
Sending PADI
Resending...
All WAN down. Reconnecting ...
也就是说router发出PADI但接收不到PADO。这种情况多发生在正在BT下载时，比如
今天，已经连线2天多了，我从5点开始下载，结果在10点发生状况。
解决的办法只有一条：重启modem。重启后马上连上。
已经换掉router和modem，新的问题依然存在。所以基本可以排除router/modem问题。
关于线路，在发生问题前后线路没动过，而且modem状态显示SNR margin和衰... 阅读全帖 |
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m*d
发帖数: 7658 | 43 不懂别乱叫，router和cable modem还分不清？
Upstream Value
Channel ID 3
Frequency 37000000 Hz
Ranging Service ID 5944
Symbol Rate 5.120 Msym/s
Power Level 53 dBmV |
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i*******h
发帖数: 216 | 44 我家是Comcast，有一个Modem，和两台（或三台）TV，因此要有一个Splitter，因为现
在到Modem的信号不好，（Upstream 的Channel Power为51.6 dBmV，高于额定的50），
所以得换个好点的。
我不是太懂这个，听说有专用的可以让到Modem的出口信号和到TV的信号有所不同。当
然我是说那种Passive的。
或者帮我科普一下也行，那些出口参数Hz和dB是多少比较合适？
谢谢。 |
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Q**g
发帖数: 183 | 45 upstream power level 太高了。到modem的信号太弱。要搞到50 dBmV以下。
如果modem接了 splitter 的话，拆掉splitter 把modem直接接到进线上，
再看看信号。如果还是太差的话，打电话叫comcast来查查原因 |
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l*i
发帖数: 5732 | 46 Dell的是不是对显卡的要求低？ 韩国的只有几种外接显卡可以用：
Dell的spec：
CONNECTIVITY
High Definition Multimedia Interface (HDMI)
2 Digital Visual Interface connectors (DVI-D) with HDCP
DisplayPort (DP)
Video Graphics Array (VGA)
Component Video
Composite Video
1 USB 2.0 upstream port
4 USB 2.0 downstream ports
8 in 1 Media reader
DC power connector for Dell Soundbar |
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a******8
发帖数: 660 | 47 use a monitor with upstream usb ports (for mouse and keyboard) and a
downstream usb port with usb cable connecting to PC/laptop)
all you need to do is switch the usb cable between PC/laptop |
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i***l
发帖数: 9994 | 48 It Will Soon Be Possible to Deliver Many Popular Games as Snaps for Ubuntu
16.04
snapd 2.0.5 has been released with many improvements
Canonical's Zygmunt Krynicki and Michael Vogt have announced the debut of
snapd 2.0.5, the fifth maintenance release in the stable 2.0 series of the
Snappy daemon for Ubuntu Linux.
Canonical doesn't give up on its new technologies, and Snaps might just
become popular sooner than you might think. We've already told you that
packaging your application as a Snap is n... 阅读全帖 |
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F***Q
发帖数: 6599 | 49
0
always install cuda via nvidia's upstream repository. make it much easier to
reinstall/upgrade.
also run
nvidia-smi
to make sure your nvidia driver/cards are properly installed
to test for opencl library, run
sudo apt-get install clinfo
and type clinfo to see if your gpu is detected.
if any of these fails, type "echo $LD_LIBRARY_PATH" to see if you have
included the needed path to libopencl.so. |
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p*******m
发帖数: 20761 | 50 Steve Gibson's Three Router Solution to IOT Insecurity
Author: Nicolae Crisan
Date: August 15, 2016
Subject: General Tech
Manufacturer: Various
Tagged: networking, network, iot
Introduction
Even before the formulation of the term "Internet of things", Steve Gibson
proposed home networking topology changes designed to deal with this new
looming security threat. Unfortunately, little or no thought is given to the
security aspects of the devices in this rapidly growing market.
One of Steve's propos... 阅读全帖 |
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