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全部话题 - 话题: packets
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c****a
发帖数: 76
1
来自主题: SanDiego版 - 免费 6瓶PediaSure and Enfamil奶粉
I have the following items to give away:
1. 6 bottles of PediaSure
8 fl oz/bottle
expiration date: 9/1/13
2. Enfamil Easy Pour Single-Servce Packets (infant formula 0-12 month)
Expiration date:12/1/2012
16 packets in the box. Each Packet can make 4oz bottle
求Similac奶票或Coupon.
谢谢!
站内联系
b*s
发帖数: 82482
2
来自主题: LeisureTime版 - 晚安,北京(4)
Question: Are ramen noodles vegetarian?
Answer: Wondering if you can eat cheap ramen noodles on a vegetarian diet?
Well, I’ve got good news for you – yes, you can! But it’s not that simple
. So keep reading.
Ramen noodles are made from wheat flour and oil, usually with a few extra
ingredients for flavor, such as salt, or additional fillers such as potato
starch. So, then what's the problem? It's the seasoning packets that are
nearly always decidedly not vegetarian, as they usually contain such
a... 阅读全帖
f********4
发帖数: 2883
3
Talking to Molly McNearney, the Co-Head Writer of Jimmy Kimmel Live
http://splitsider.com/2011/11/talking-to-molly-mcnearney-the-co
One of the most hot button issues in comedy right now is the lack of women
writing for late night. Molly McNearney is the only woman who currently
writes for Jimmy Kimmel Live, but she is also the co-head writer. Molly
chatted with me about how she got her start in comedy, her favorite bits
that she’s contributed to the show and what it’s like being a woman behind
t... 阅读全帖
a**********k
发帖数: 1953
4
来自主题: Zhejiang版 - 新人报到-浙江浙江:)
有意思。
这确实是一个复杂问题, 一般来说,跟具体的问题及数据属性
也有关,很难有通用有效的算法。
举个例子, Encrypted Skype Traffic detection, 我曾经
试过Bayesian, ML,Stochatic等算法,发现每种方法只在
某种情形有效, 跟Protocol type(UDP vs.TCP), Traffic
type( VoIP packets vs. data packets vs. signalling
control packets) 和Topology(Super node vs. End node)有关。
另外,每月Global mobile IP traffic已到达EB级了, big data
技术大有可为。

done
m**u
发帖数: 632
5
【 以下文字转载自 EE 讨论区 】
【 原文由 mliu 所发表 】
我指interconnection networks, 通常用与parallel computing那种,每个
router与一个processor相连
在一个mesh network中,一个router可能有5个IO
4个用于4个方向的routing,另外一个负责与processor的communication
我的问题是,我知道processor可以发个packet到任何一个方向的IO,
但是它可以同时把一个packet发到两个或多个IO吗.或者,对于一个router
来将,它能把一个方向进入的packet同时发送到其他两个方向吗
谢谢
我不是搞这个的可能说的不清楚,请回信箱
p*****r
发帖数: 2
6
I think the TCP sequence of the data should be considered when calculating
TCP jitter. But when I googled, no paper mention about it.
Especailly in RFC 1889, it said: not necessarily in sequence
"The interarrival jitter is calculated continuously as each data
packet i is received from source SSRC_n, using this difference D for
that packet and the previous packet i-1 in order of arrival (not
necessarily in sequence), according to the formula.
"
Am I wrong?
c*a
发帖数: 806
7
来自主题: EmergingNetworking版 - Verizon Virtually blocks China Internet
赫赫,来一个比较吓人的subject
最近转了Verizon FIOS, 发现上当了,访问中国网站极慢。先从verizon 到UUNET,
然后再转sprint, 到达中国后再接中国的ISP, 至少要24 hops, 而且有significant
packet loss
www.yahoo.com.cn 5% loss
www.sina.com.cn 13%
www.cmfu.com 13%
some novel websites 29% almost connectionless (no connection:)
看来还是要转回原来的ISP, 那时他们有直接peering with China Telecom,
no packet loss.
大家share一下你们的packet loss? 是哪个ISP?
o*****l
发帖数: 539
8
来自主题: EmergingNetworking版 - suspicious internet traffic
Hi,
I have a new purchased PC with windows 7 installed.
Today I found my computer is keeping send UDP packet to some strange IP
address. Destination port is 11038, 9072, unizensus or global-wlink.
I use wireshark to trace the packet, found those IPs are all outside US.
For example:
83.38.56.36
93.45.127.160
85.127.119.137
61.155.106.168
87.2.185.194
91.90.15.52
any idea? How to find out which process is sending out these UDP packet?
Is it possible to get more info about those IP?
Thanks!
s*****g
发帖数: 1055
9
来自主题: EmergingNetworking版 - 请教ASA5510 配置
For testing purpose, keep "access-list 100 extended permit ip any any" and
try packet tracer again. Your packet tracer should look like this
packet-tracer input outside tcp 1024 50.20.38.
106 www
c*****i
发帖数: 631
10
来自主题: EmergingNetworking版 - 谁能给解释一下loopback address么?
switch virtual interface. cisco switch在不同vlan间switch packet用的。比如你
有2个vlan,vlan里面的pc的default gateway就设为switch对应那个vlan的svi
address,这样vlan里面的pc就可以send packet出去了.

to indicate a network. Each physical port can be associated with a SVI.
Basically it is a way to tell control plane kernel that if dest MAC matches
the assigned ports, and dest IP matches the SVI, dispatch the packet to
control plane daemons, based on port numbers, that are listening on the IP
address.
x*********n
发帖数: 28013
11
来自主题: EmergingNetworking版 - 学了一个月的QOS
queuing is congestion management tool
shaping and policing is congestion avoidance tool
shaping is not just drop, it is actually buffer the packets.however,
policing is.
WRED has function such as mimimum threshold, and maximum threshold, between
them, there is probability to mark all the packets, based on dscp or ip
precedence, the chance of each packet to be drop is different,sounds like
smart, right?
I wish i could had chance to listen to zher's lecture, some topics I even
haven't heard of bef... 阅读全帖
z**r
发帖数: 17771
12
来自主题: EmergingNetworking版 - 学了一个月的QOS
2 things you are missing:
1. there are always multiple tcp sessions in the real world
2. without congestion avoidance like RED, whenever there is a drop, it's
tail drop.
So, when the link is congested, all the packets that are not in the queue
yet will be tail dropped, and these packets are from multiple tcp sessions.
Thus results in transmission wave or global sync, big waste of bandwidth (
queue actually)
With congestion avoidance like RED/WRED/FRED/etc., the lower priority
packets with higher... 阅读全帖
v***v
发帖数: 5504
13
来自主题: EmergingNetworking版 - 4948 switch ipv6 support
这段写得的确有点给咱们老中加压,其实意思是,别的ICMPv6都不会针对multicast/
broadcast 产生,而packet too big message是个例外,它甚至需要对不能forward的
multicast message也产生。(更何况unicast,针对unicast的是前一段的MUST)
同样在RFC 4443,这段就清楚一点
(e) An ICMPv6 error message MUST NOT be originated as a result of
receiving the following:
(e.1) An ICMPv6 error message.
(e.2) An ICMPv6 redirect message [IPv6-DISC].
(e.3) A packet destined to an IPv6 multicast address. (There are
two exceptions to this rule: (1) the Packet Too... 阅读全帖
a**********k
发帖数: 1953
14
来自主题: EmergingNetworking版 - 从中国美国,如何才能使网速访问很快呢?
As Zher said, it could be application specific.
For instance, with the most popular http traffic,
after you capture the flow with tcpdump or wireshark,
for each http request, there is usually one ack packet
(per TCP state machine), and one or more http reply packets.
The time difference between http request and the ack packet
indicates the network latency, while the time difference
between the ack and http reply indicates the application
latency.
x*********n
发帖数: 28013
15
来自主题: EmergingNetworking版 - 问一个recursive route的问题。
B和C能互相ping,是通的。
现在要C的LAN能从A出去。
理解1:
在A加上
ip route 71.71.71.0 255.255.255.0 76.76.76.2
这样,这个packet去C会走到B,到了B,因为B知道怎么去C,所以,这个packet就等到C。
理解2:
在A加上
ip route 75.75.75.0 255.255.255.252 76.76.76.2
ip route 71.71.71.0 255.255.255.0 75.75.75.2
这样就work了,packet要去C,先走到B,到了B在走到C。
差别在于理解1,A router 2个hop都知道,但是理解2,A只知道1个hop
我现在挺迷茫的,为啥,理解1,不work啊。我觉得应该work啊。
t*******r
发帖数: 3271
16
来自主题: EmergingNetworking版 - PTX! PTX!
回到电脑跟前了, 那些说PTX一点儿PE feature没有的, 睁大了眼睛看着
COS related features
PTX supports following types of classifiers:
 dscp
 dscp-ipv6
 exp
 ieee-802.1
 ieee-802.1ad
 inet-precedence
 ifl based fixed classification
PTX supports max of 32 classifier tables per Type and max of 64 classifier
tables for all types together.
The following rewrite types are supported:
 dscp;
 dscp protocol mpls;
- Apply to IPv4 packets entering MPLS tunnel; r... 阅读全帖
i*i
发帖数: 918
17
来自主题: Hardware版 - HTPC+NAS 二合一
这个话就比较长了。以前架过一个http server,但从外面下载个mp3都需要几分钟,没
什么用处。不过我当时网络的上行速度只有几百k,现在下行30Mbps,上行3.7Mbps,可
能还可以忍受。
关于那个win 7 网络,据说是加了一些高级功能,真正害人啊。我原来用一个非常老的
机器,windows XP, USB2,windows share的速度一般是20 - 30MBps。升级了后,赫然
100-200KBps,task manager->network utilization 只有0.2%,怎么查也没发现有什
么问题。google 了一下 windows 7 network share slowness,发现是一个老问题,谁
也不知具体是什么回事。各种解决方案有十几种,没一个好用。最后从一个地方发现有
人说要用static IP address,改了之后立马network utilization 高于80%,速度到了
100 - 120MBps。之前根据他人推荐还设置了(cmd.exe下)
netsh interface tcp set global heuristics=... 阅读全帖
f**y
发帖数: 138
18
When you construct a TCP RST packet, you may have to match the seq, ack as
well as src/dst IP and port with the existing TCP session, otherwise the
server may ignore the packet.
Regarding the time out, the linux system default TCP keepalive is 2 hours.
The application can not rely on 'select' or 'recv' to determine if the other
end of the socket is closed. It is simply too long. On the other hand, the
application can send packets periodically and catch the SIG_PIPE signal to
forcefully determine
d****o
发帖数: 1112
19
来自主题: Linux版 - what is this?
奇怪得很,router ASUS 520不能从serser那里得到地址,不停地try to complete PPP
oE discovery, 但是能上网。。。ip phone也没问题。这是啥原因啊?
Jul 9 21:56:36 pppd[83]: Unable to complete PPPoE Discovery
Jul 9 21:57:41 pppd[83]: Timeout waiting for PADO packets
Jul 9 21:57:41 pppd[83]: Unable to complete PPPoE Discovery
Jul 9 21:58:46 pppd[83]: Timeout waiting for PADO packets
Jul 9 21:58:46 pppd[83]: Unable to complete PPPoE Discovery
Jul 9 21:59:51 pppd[83]: Timeout waiting for PADO packets
Jul 9 21:59:51 pppd[83]: Unabl
c******n
发帖数: 4965
20
来自主题: Programming版 - question on TCP slow start
I understand it as follows (please point out my errors, if it's wrong):
TCP starts sending congestion_window_size=SLOW_START_VALUE packets, then
wait for acks, with each ack, congestion window is increased by 1,
essetially doubling it with every sending.
but I did a tcpdump, and send out a 8000byte msg, which is sent out in 6
1xxx-byte packets, then all the 6 packets are sent out immediately, without
waiting for the ack. so slow start is not working here ???
Thanks
h****r
发帖数: 2056
21
来自主题: Programming版 - 10M persistent TCP connections
简单的说,10 gigabits/second和10 million packets/second只取一个就行了,
那这两个里面显然是该是10 gigabits/second。
实际应用之间packet的size区别可以非常大,Assuming 1k per packet是没有实际工作
经验的提法,无意义地简化一个具有通用性的问题,POC确实是容易做了,paper也容易
写了,但是于build on top的application的参考价值就小了至少几个级数。
我如果有一点点insight的话,就是我处理distributed logging的时候碰到过这种问题
,Assuming和不Assuming之间的复杂度差异之大,确实不是一开始能想象的。
但是一个通用的应用,卖到千千万万的客户那里去,必须能处理有差异的情况。
S*A
发帖数: 7142
22
来自主题: Programming版 - 10M persistent TCP connections

我觉得你的理解有问题。人家说 C10M, 没有说你做到 11M 就不是了。
人家就是要画一条线,说,这条线一以下的不是罗氏的 C10M。
这个 10M packet per second。 人家画了 10M packet/s 的线,就是
说,低于这个数字的还不够格。从标准的角度来说,人家的要求是更严格
了不是更松了。这里是个大于等于的关系。
也就是说,单纯依靠大包到达 10G的情况,在你的标准是 pass 了,
robert 认为是没 pass, 不是比你的标准严格么?
这是因为你还没有体会隐含的大于等于关系。我知道你想说通用
更好。我觉得原来人家的定义没有矛盾,只是指出这种低 packet rate
的 10G 还不够好。这个是有现实意义的。
所以你没有要求人家有要求其实是更加严格了。
你出口就说人家没有动手做过这个也有点太武断,
和我说你没有做过一样,是不是有点这个意思?
BTW, 我认为 Robert 说的 C10M 是他自己做过的。看看他的talk。
h****r
发帖数: 2056
23
来自主题: Programming版 - 10M persistent TCP connections
简单的说,10 gigabits/second和10 million packets/second只取一个就行了,
那这两个里面显然是该是10 gigabits/second。
实际应用之间packet的size区别可以非常大,Assuming 1k per packet是没有实际工作
经验的提法,无意义地简化一个具有通用性的问题,POC确实是容易做了,paper也容易
写了,但是于build on top的application的参考价值就小了至少几个级数。
我如果有一点点insight的话,就是我处理distributed logging的时候碰到过这种问题
,Assuming和不Assuming之间的复杂度差异之大,确实不是一开始能想象的。
但是一个通用的应用,卖到千千万万的客户那里去,必须能处理有差异的情况。
S*A
发帖数: 7142
24
来自主题: Programming版 - 10M persistent TCP connections

我觉得你的理解有问题。人家说 C10M, 没有说你做到 11M 就不是了。
人家就是要画一条线,说,这条线一以下的不是罗氏的 C10M。
这个 10M packet per second。 人家画了 10M packet/s 的线,就是
说,低于这个数字的还不够格。从标准的角度来说,人家的要求是更严格
了不是更松了。这里是个大于等于的关系。
也就是说,单纯依靠大包到达 10G的情况,在你的标准是 pass 了,
robert 认为是没 pass, 不是比你的标准严格么?
这是因为你还没有体会隐含的大于等于关系。我知道你想说通用
更好。我觉得原来人家的定义没有矛盾,只是指出这种低 packet rate
的 10G 还不够好。这个是有现实意义的。
所以你没有要求人家有要求其实是更加严格了。
你出口就说人家没有动手做过这个也有点太武断,
和我说你没有做过一样,是不是有点这个意思?
BTW, 我认为 Robert 说的 C10M 是他自己做过的。看看他的talk。
S*A
发帖数: 7142
25
来自主题: Programming版 - 10M persistent TCP connections
你还害臊不?原文连接你开始没有给,我求了两次才给的。

我第一次提出疑问,引文里有你的原文
{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{
你说的是 Robert ? 他说了必须要重新写网络协议?这个听起来很不 make sense.
改了协议那些以前用旧协议的用户怎麼办啊?是不是可以选的协议还是有什么
理解上的问题啊。
求出处。你说的不会是 TCP TIME Wait 的问题把。
}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}
我第二次问你的出处
{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{
}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}
然后你的回答:
{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{
http://blog.erratasec.com/2013/02/custom-stack-it-goes-to-11.ht
这里不写着吗,custom network stack. You don’t want a fu... 阅读全帖
d***a
发帖数: 13752
26
packet socket以前没有...
用packet socket和nmap后,程序可以直接处理packet数据吧
当然也可以在user space实现自己的tcp api
d**d
发帖数: 389
27
来自主题: Programming版 - 请教一个C++的设计问题
resolve coupling between packages。
level 1 decoder需要读出header里面的descriptor的内容才能知道当前payload是不是
一个有效的paylaod,或者当前payload在level 2 packet里面的位置,比如是不是
level 2 packet的开始数据,或者是最后一段数据,或者是第n/N段数据。有时间level
1 packet的payload就是些无效的填充数据0xFFFF而已。
W*****Y
发帖数: 433
28
来自主题: Security版 - 急!求教backup计算题,多谢了!
A company has the following IT characteristics:
Item Quantity Capacity
Server 8 200 GB / server
Workstations 75 40 GB / workstation
Laptops 25 8 GB / laptop
Tape Drive 1 Holds one 32 GB tape
The company wants to institute a new backup policy, with full backups done
over the weekend (Friday 8pm to Monday, 6am). It takes 2 minutes to swap a
new tape into the Tape Drive. For reliability, a 100-byte ... 阅读全帖
w***z
发帖数: 1848
29
来自主题: Unix版 - 紧急求助!
关键是有什么command/function可以获取这个packet的大小。事实上我知道这个大小是多
少,因为client端向server端发送的请求就是要server端send一个x大小的packet。但x是
个server端的可变参数。所以问题就是每次client端接收到一个x大小的packet,client
如何获取这个x呢?

端的socket。
m*******e
发帖数: 310
30
来自主题: Windows版 - 求教Vista 无线上网的问题??
We know some routers crashed when receiving some packets from Vista,
especially packets with 1Q tag or uncommon Ether type. Your router is just
one of them. Upgrade the firmware if possible. Otherwise, you can try to
disable QoS Packet Scheduler (most likely) and/or Link-Layer Topology
Discovery Mapper I/O Driver and/or IPv6 (less likely)
z*****n
发帖数: 7639
31
Broadcom's chipset uses three techniques to boost speed within the 802.11g s
tandard: frame bursting, fast frames, and compression. Frame-bursting client
s send multiple data packets during each time period they're allowed on the
air. This reduces packet overhead and levels the playing field for "g" clien
ts in a mixed "b/g" network, since "g" clients can send three packets of dat
a in the same amount of time it takes for a "b" client to send one. Frame bu
rsting is probably the technology most
z*****n
发帖数: 7639
32
来自主题: EE版 - 请教一个TCP的问题 (转载)
It depends on how these packets are re-assembled by
the IP layer.
If the TCP layer at the receiver receives incoming
packet (from its own IP layer) one by one, then
individual ACKs are sent back. If IP layer buffers
several packets and sends to TCP together, then
the last one is ACKed. Actually I am not sure the
mechanism of IP layer re-assembly function. This
question is also open to me...
z*****n
发帖数: 7639
33
Well, this question is related to the network
for sure, especially the processing logic in
network routers.
Routers process the incoming packets in FIFO
fashion. If you have only one session/thread,
then in a unit time a router relays one packet
for you, if you have multiple sessions, the
sending part pushes more packets into the network
and in result you get higher throughput.
s**********8
发帖数: 25265
34
来自主题: MedicalDevice版 - Humanitarian Use Devices (HUD)
DEFINITIONS:
I. HUMANITARIAN USE DEVICE (HUD): A device that is intended to benefit
patients
by treating or diagnosing a disease or condition that affects fewer than 4,
000
individuals in the United States per year.
II. HUMANITARIAN USE DEVICE EXEMPTION (HDE): Food and Drug Administration
(FDA) approval of an HDE permits the marketing of an HUD, subject to
restrictions
on charges and use. Specifically, HUDs cannot be sold for profit, except in
the
limited circumstance when indicated for use in c... 阅读全帖
i*********5
发帖数: 19210
35
你骑车时怎样戴gels?bento box or electrical tape?我喜欢用tape。
• Individual gel packets can also be stored in a bento box style
carrier, popular in triathlon racing.
• Another trick from the triathlon pros is to tape gel packets along
your bike’s top tube. Only tape down the tear-off top tab; when you’re
ready to consume just grab a GU and the top will stay in place, your packet
perfectly opened and ready to eat.
o**********e
发帖数: 18403
36
来自主题: CivilSociety版 - OCAnational Fellowship
OCA Seeking Candidates for 2014 – 2015 Civil Rights Fellowship
FOR IMMEDIATE RELEASE
1 April 2014
CONTACT
Kham Moua | Civil Rights Fellow
202 223 5500 | k***[email protected]
WASHINGTON, D.C. – OCA – Asian Pacific American Advocates, a national
membership-driven organization of community advocates dedicated to advancing
the political, social, and economic well-being of Asian Pacific Americans (
APAs), is seeking qualified candidates for the 2014 – 2015 OCA Civil Rights
Fellowship.
The OCA Civil ... 阅读全帖
m******r
发帖数: 9604
37
来自主题: _Triathlon版 - Coach KP Online: Ironman Nutrition
The following is a suggested guideline for reducing the likelihood of an in-
race stomach "shutdown" while eating prior to, during, and immediately
following an Ironman-distance race for experienced athletes who are focused
on fast times or race placement. If your goal is to finish the race then the
pacing instructions here will be too aggressive, but the refueling
suggestions may still be effective.
You may need to modify this plan to fit your body size, previous race-
nutrition experience, and... 阅读全帖
w*******y
发帖数: 60932
38
On Newegg.
Security:
Firewall: NAT and SPI (Stateful Packet Inspection), intrusion detection
including logging Logging: Dropped packet, security event, Syslog Filtering:
Port, IP packet, URL Keyword, MAC address Encryption: 64/128-bit WEP, WPA,
WPA2, TKIP, AES, WPA-PSK, WPA2-PSK Authentication: MAC address Access
Control
WPA/WPA2:
WPA2
Ports:
1 x 10/100M WAN; 4 x 10/100M LAN
LEDs:
Power x 1, AIR x 1, WAN x 1, LAN x 4
Wireless Data Rates:
Up to 150Mbps
Frequency Band:
2.4GHz - 2.5GHz
Antenna:
1 x... 阅读全帖
w*******y
发帖数: 60932
39
Link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16833320039
use code EMCKGJK53 @ checkout, this time i do not think it is limited to
being on the mailing list but please let me know if it is.
Security:
Firewall: NAT and SPI (Stateful Packet Inspection), intrusion detection
including logging Logging: Dropped packet, security event, Syslog Filtering:
Port, IP packet, URL Keyword, MAC address Encryption: 64/128-bit WEP, WPA,
WPA2, TKIP, AES, WPA-PSK, WPA2-PSK Authentication: MAC addre... 阅读全帖
w*******y
发帖数: 60932
40
ASUS RT-N10+ IEEE Wireless Router EZ N 802.11b/g/n Support up to 4 SSID in
Business (Open source DDWRT support)
In stock. Limit 2 per customer.
$14.99 after mail-in rebate card
Receive a $10 prepaid card by mail from ASUS! Expires on 7/31/11 (print
rebate)
FREE SHIPPING (restrictions apply)
Security:
Firewall: NAT and SPI (Stateful Packet Inspection), intrusion detection
including logging Logging: Dropped packet, security event, Syslog Filtering:
Port, IP packet, URL Keyword, MAC address Encrypt... 阅读全帖
w*******y
发帖数: 60932
41
Mr. Root Beer 20041 Home Root-Beer-Making Kit $13.49 free shipping with
Prime (FSSS) from AmazonRoot-beer-making kit offers a fun way to brew 2
gallons of creamy old-fashioned root beer at home
Includes 1 bottle of root-beer extract
2 packets of flavor crystals
1 packet of root-beer yeast
1 packet of no-rinse cleanser
4 1-liter bottles with caps and labels
1 funnel
Instruction Sheet & Guide
Mr. Root Beer 20041 Home Root-Beer-Making Kit:
http://www.amazon.com/Mr-Root-Beer-20041-Root-Beer-Making/d... 阅读全帖
w*******y
发帖数: 60932
42
Amazon and Buy.com both currently have the Asus RT-N16 router for sale for $
76.99 with free shipping.
Mail in rebate form to get an extra $10 back, bringing the final price (sans
any applicable taxes) to $66.99. Rebate valid until 8/31.
- Amazon:
http://www.amazon.com/gp/product/B00387G6R8/
-- Rebate Form:
http://g-ecx.images-amazon.com/images/G/01/00/00/16/19/56/69/16
- Buy.com:
http://www.buy.com/prod/asus-rt-n16-multifunctional-n-gigabit-w
-- Rebate Form:
http://ak.buy.com/buy_assets/ret... 阅读全帖
z***e
发帖数: 5393
43
来自主题: Military版 - 墙推动了技术进步
btw,vista/win7已经提供了对内核网络packet进行修改和reinjection的API (Windows
filtering platform),犯不着去用libpcap这些东西,如果我没记错,libpcap起码
在windows上只能copy received packet,无法对send出去的进行修改。

l****g
发帖数: 43
44
除了前面人家建议你看的这几个概念: 1.带宽;2.信噪比,3.容量
你还应该看看: 4. round trip delay and throughput 5. packet loss and
throughput in wireless network 6. channel scheduling and packet queue
从你的几个回文,看得出你对TCP/IP网络和无线网络的fundamental limits和实际工程
实现的限制所知甚少。甚至连OSI的分层模型都不甚了了。你所描画的以卫星作为HUB连
接地区、乃至全国的WIFI接入,仅仅不过是在纸上画图的水平而已,眼中只有网络拓扑
结构这个观念(如果你有的话),对带宽,延迟,队列与调度完全没有概念。对现在社
会的一个小区一个城市的用户流量总量也没有任何概念。
T**********e
发帖数: 29576
45
SpaceX制造发射几百个近地卫星(750哩),因为轨道低信号速度比同步卫星要快,而且
因为光速在真空里比光纤里快40%,最终网络速度要超过现有地面网。
以后扩大系统,信号可以达到火星殖民地。
Elon Musk's Plan to Build a Space Internet
Musk is tonight hosting a SpaceX event in Seattle, where the company is
opening a new office. The talk will mostly be about SpaceX’s plans for
hiring aerospace and software engineers in the Pacific Northwest to boost
the company’s rocket-building efforts. But he'll also use the talk to
announce his newest idea, which would launch a vast network of communicat... 阅读全帖

发帖数: 1
46
来自主题: Military版 - 12月10日 可能的历史
Yarmouth Port, Massachusetts
From Wikipedia, the free encyclopedia
Yarmouth Port, Massachusetts
Census-designated place
Boardwalk at Bass Hole
Location in Barnstable County and the state ofMassachusetts.
Coordinates: 41°42′17″N 70°13′15″WCoordinates: 41°42′17″N 70°13′
15″W
Country United States
State Massachusetts
County Barnstable
Town Yarmouth
Area
• Total 6.47 sq mi (16.76 km2)
• Land 6.04 sq mi (15.65 km2)
• Water 0.43 sq mi (1.11 km2)
Elevation 52 f... 阅读全帖

发帖数: 1
47
来自主题: Military版 - 12月25日 圣诞节快乐!
在网上发现了一个圣诞节商店,商店的建筑很有特色,而且遍布全美国,大概有70多个
店铺,以后大家买圣诞节用品可以去那里,似乎各州都有。我们这里和麻州的地址是:
CHRISTMAS TREE SHOP AUGUSTA, GA, 239 ROBERT C. DANIEL JR. PARKWAY,
AUGUSTA EXCHANGE, AUGUSTA, GA 30909, 706.738.0570, CHRISTMAS TREE SHOP
, MAGNOLIA PARK, 1117 WOODRUFF ROAD, GREENVILLE, SC 29607. 864. 297.
3667
CHRISTMAS TREE SHOPS NATICK, 1298 WORCESTER ST. ROUTE 9, SHERWOOD
PLAZA, NATICK, MA 01760, 508.655.9800
CHRISTMAS TREE SHOPS SOMERVILLE, 177 MIDDLESEX AVENUE, ASSEMBLY SQUARE
... 阅读全帖
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