g*****e
发帖数: 87 | 1 Lots of firewalls blocks ICMP which means ping might not work at all.
Try to telenet destIPaddress port to see if you can open the port or not.
Install wireshark/ethereal or tcpdump to see if you can start the TCP three
way handshaking process or not. You might be able to see if your nearest
gateway stop you or destination rejects you or something in between. |
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h**o
发帖数: 548 | 2 我是要编一段程序(shell or perl) 看snoop里有无我要的字符串. 不是用眼睛看. 所
以winshark 和
ethereal 都不适和我.
假设我的snoop 结果 是 a.snoop,前文说的snoop.txt是我用
snoop -i a.snoop -x0 > snoop.txt 得到的. 但snoop.txt中可读的文本在最右列, 我
还得某种方
式把可读的文本取出来再search我要的字符串. 麻烦.
我现在想了一个别的办法:
snoop -i a.snoop -v > a1.txt, 这样我可以从a1.txt里得到packet headers 信悉了(而
我要找的字符串 就应在http header 里).如:
TCP: No options
TCP:
HTTP: ----- HyperText Transfer Protocol -----
HTTP:
HTTP: GET /beast_uns/index.php HTTP/1.0
HTTP: User-Agent: Wget/1.11.1 (Red Hat modified)
HTTP: Accept: |
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T********i
发帖数: 2416 | 4 这么简单的OS，对我来讲就是while loop那个级别的。我还说过，这玩意儿你叫他OS也
行。其实critical path就是几个while loop而已。
你先说说这么简单的OS够不够？几千行能不能搞得定？这是核心问题。
至于什么5G，我没兴趣再找那些大玩家进来。我就是要用娱乐系统的wifi升级咋地？你
不服气么？你就说安全不安全吧？至于是否用can bus倒是可以商量。反正ether phy也
不贵。
咱先把核心问题解决了。再探讨我这个小作坊是不是应该搞自动驾驶的问题。
年轻人，别冲动。谦虚谨慎一点。 |
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T********i
发帖数: 2416 | 5 这么简单的OS，对我来讲就是while loop那个级别的。我还说过，这玩意儿你叫他OS也
行。其实critical path就是几个while loop而已。
你先说说这么简单的OS够不够？几千行能不能搞得定？这是核心问题。
至于什么5G，我没兴趣再找那些大玩家进来。我就是要用娱乐系统的wifi升级咋地？你
不服气么？你就说安全不安全吧？至于是否用can bus倒是可以商量。反正ether phy也
不贵。
咱先把核心问题解决了。再探讨我这个小作坊是不是应该搞自动驾驶的问题。
年轻人，别冲动。谦虚谨慎一点。 |
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d**u
发帖数: 44 | 6 问一下你好有不久的了？
查贺你本级连接的IP。
ethereal挺好的。 |
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l***n
发帖数: 23 | 7 【 以下文字转载自 Linux 讨论区,原文如下 】
发信人: levin (失语), 信区: Linux
标 题: 这是有人在hack实验室里的机器吗？
发信站: The unknown SPACE (Thu Aug 15 17:45:30 2002) WWW-POST
装了prelude，可是却看不懂prelude.log
例如以下一段：
*** Thu Aug 15 06:53:42 2002 - Thu Aug 15 06:53:42 2002
Plugin : HttpMod
Author : Yoann Vandoorselaere
Contact : y***[email protected]
description : Snort based http decode plugin.
kind : May not be reliable
received : 2 times
message : ISS Unicode attack detected
Ether hdr : 0:8:a3:78:85:ff |
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p***p
发帖数: 559 | 8 www.ethereal.com
太爽了,电脑在干什么一点都跳不出如来佛的手掌
这种控制感巨爽,简直和中国电信感觉一样 |
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m**t
发帖数: 1292 | 10 find a sniffer such as Ethereal to check the packets |
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O**n
发帖数: 133 | 11 只想得到每个packet的payload部分。
因为是很大的tcpdump file（~1G),不可能用ethereal这种interactive的工具。
看了tcpdump的manual，也没有找到相应的flag.
请问有没有什么工具可以做到这一点的？
多谢了！ |
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m**t
发帖数: 1292 | 12 install lastest service pack may fix, use anti-virus software should work too.
Worst if you have some networking knowledge, try grab a ethereal software and
sniff your computer, see what kind of odd packets are being sent from
your computer
... |
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o*****e
发帖数: 23 | 14 【 以下文字转载自 Programming 讨论区,原文如下 】
发信人: oldbare (bearhill), 信区: Programming
标 题: how can i use c or c++ to get the Ethernet card address
发信站: The unknown SPACE (Thu Mar 8 01:13:03 2001) WWW-POST
Thanks a lot first.
I use UNIX system. And I need to find the 48 bits of ether
net address. |
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m*****e
发帖数: 4193 | 15 arp will check the arp table. ping just guarantees the host's ether addr
is in the table (unless it's dead).
and you have to specify the actual hostname, not "localhost". |
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m*****e
发帖数: 4193 | 16 OK, tell you a very simple method:
reboot the machine, and read the console. Ethernet address is printed
out in the first three lines (before memory is checked).
Or you may try running 'dmesg' and grep sth like 'ether' or 'MAC'.
If there is a simpler way, let me know. |
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T********r
发帖数: 6210 | 17 IP does not matter as far as there is an empty IP not taken in the subnet.
DNS name does not matter either. At boot stage, the clients use ARP and
broadcasting to discover install server. the install server can use its
hosts file to decide the client's possible IP.
The only thing possibly missed in my list of steps is the ethernet address
and client's IP. To do so, before step 6, do this:
echo "xx:xx:xx:xx:xx:xx clientname" >> /etc/ethers
echo "empty.ip.address clientname" >> /etc/hosts
wher |
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l******t
发帖数: 108 | 18 i think /etc/ethers is needed by bootp, /etc/hosts will be used if no
NIS server involded.
in IRIX the default bootfile and host-specific bootfile can be configured
in /etc/bootptab. does SUN have a similar file?
/etc/bootparams is also related.
it's bootp for booting, tftp for transfering files |
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m*******e
发帖数: 310 | 19 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) |
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b****y
发帖数: 169 | 20 昨天又搞了搞，还是搞不定。
我的Vista或XP都连不上这个Terminal Server.
我用ethereal看了看，连接是一度建立了，但是不知何故就断开了。
客户端和server端都没有任何出错信息。
可能还是License或加密协议的问题。
恳请版上搞定过Server2003 Terminal Server的同学指教。
谢谢。 |
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f*w
发帖数: 13 | 21 HP Vista的系统，一直很正常，直到三天前突然无法上网了，是netgear的路由器。
始终显示访问仅本地。连接同一个路由器的mac air,用xp的tp都可以上网.
用网线连接路由器也没用，连iphone的tethering也没有用。
手动设置过ip,把ipv6的钩也去掉了，
除了重装系统，还有其他什么好办法？
ipconfig /all 显示如下
Windows IP 配置
主机名 . . . . . . . . . . . . . :
主 DNS 后缀 . . . . . . . . . . . :
节点类型 . . . . . . . . . . . . : 混合
IP 路由已启用 . . . . . . . . . . : 否
WINS 代理已启用 . . . . . . . . . : 否
无线局域网适配器 无线网络连接:
连接特定的 DNS 后缀 . . . . . . . :
&... 阅读全帖 |
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e********9
发帖数: 20 | 22 前两天看到的：
My third piece of advice is probably the hardest to take. It is to forgive
yourself for wasting time. Students are only asked to solve problems that
their professors (unless unusually cruel) know to be solvable. In addition,
it doesn't matter if the problems are scientifically important — they have
to be solved to pass the course. But in the real world, it's very hard to
know which problems are important, and you never know whether at a given
moment in history a problem is solvable. At t... 阅读全帖 |
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l****y
发帖数: 169 | 24 大哥，是ether, 不是ethanol.
LASKER |
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i****g
发帖数: 3896 | 25 老外也开始关注青蒿素发现的争议了。
http://www.nytimes.com/2012/01/17/health/for-intrigue-malaria-d
The Chinese drug artemisinin has been hailed as one of the greatest advances
in fighting malaria, the scourge of the tropics, since the discovery of
quinine centuries ago.
Luigi Rignanese
Artemisinin’s discovery is being talked about as a candidate for a Nobel
Prize in Medicine. Millions of American taxpayer dollars are spent on it for
Africa every year.
But few people realize that in one of the paradoxes of histor... 阅读全帖 |
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s******y
发帖数: 28562 | 26 Polysome purification and fractionation
(Based on Davies & Abe, 1995, Methods in Cell Biology, Vol 50, Chapter 15)
1. Prepare 4.6ml 15-60% sucrose gradients in 5ml polyallomer tubes (Beckman
#326819) by
pipetting 2.3ml of 60% sucrose in buffer B followed by 2.3ml of 15% sucrose
in buffer B
(slowly, drop by drop, against the wall). Cap the tubes with rubber stoppers
and lay tubes
horizontally for 3h @RT for sucrose to diffuse (or for 2h if making 10-40%
gradient). Place the
tubes again vertically... 阅读全帖 |
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s******s
发帖数: 699 | 27 【 以下文字转载自 Chemistry 讨论区 】
发信人: starryds (土兔), 信区: Chemistry
标 题: 求两篇paper,谢谢大家了：）
发信站: BBS 未名空间站 (Thu Feb 4 10:15:51 2016, 美东)
表哥回家过年去了让我帮他下，可是我们学校医学院没有订阅，求大牛们帮忙下载，包
子答谢：）
我的邮箱是：[email protected]
/* */
文章是：
Recent development of carbon electrode materials and their bioanalytical and
environment applications.
还有一篇
Simultaneous volammetric determination of heavy metals by use of crown ether
modified eletrodes and chemometrics.
再次谢谢大家了。 |
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w*******d
发帖数: 5 | 30 add water in to force phase separation.
ethanol will be partitioned into to polar waters phase mostly. |
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T*****y
发帖数: 225 | 32 昨天用ease-off 清洗抽油烟机filter. 这个东西很强大，喷到油垢上面，滋滋啦啦
反应一会儿，再用水一冲，就干净了。冲完以后，也没戴手套，把下面垫的破报纸
拿起来，攥了攥，扔到垃圾桶。过了一会儿，觉得右边耳朵里面有一点疼，一阵一
阵的，同时发现右手肿了，明显比左手大一圈。今天早上起来好了一点，耳朵不怎
么疼了，可是右手还是肿着。
在网上查了一下，ease-off 有这些成分，
Butane (1-5)
Diethylene glycol monobutyl ether (5)
Monoethanolamine (MEA) (0-5)
Sodium hydroxide (0-5)
请各路科学家帮忙看一下，我是不是中毒了？有什么解药？多谢了。 |
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s****r
发帖数: 736 | 33 【 以下文字转载自 Chemistry 讨论区 】
发信人: sanger (不是songer，是sanger！), 信区: Chemistry
标 题: 求教萃取剂的选择
发信站: BBS 未名空间站 (Sun Jun 3 05:02:20 2012, 美东)
由于试验需要，在水相反应中必须添加一定量表面活性剂。在反应结束后，又必须去除
该表面活性剂。现在基本的想法用有机物萃取分离表面活性剂。但是该表面活性剂亲水
性很高（HLB ~10）， 一般的有机物，如hexane，diethyl ether，都无法将其萃取出
来。所以在此求教各位xdjm，有什么好的萃取剂推荐么？ |
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B******1
发帖数: 9094 | 34 I heard that Dr. Dale Boger once said: to be a true chemist, you have to
distill diazomethane a dozen times . . .
As to Trimethylsilyl Diazomethane, which is a methylating reagent, what kind
of harm can it do in a human body other than making a few methyl esters of
free acids? That beats me.
I know diazomethane is harmless since legend has it that a crazy chemist
sprayed a few mL of a solution of CH2N2 in ether on his arms and he was Okay afterwards. |
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y**********3
发帖数: 339 | 35 Introduction 1
Chapter 1 Solution
Chapter 2 the Halogens
Chapter 3 Structure of Matters
Chapter 4 Chemical Reaction Rates and Equilibrium
Chapter 5 Electrolyte Solution
Chapter 6 Coordination Compounds
Chapter 7 Oxidation-Reduction Reactions (Redox Reaction)
Chapter 8 the Group 6A and 5A Elements
Chapter 9 Introduction to Organic Compounds
Chapter 10 Alkanes
Chapter 11 Cycloalkanes
Chapter 12 Alkyl Halides
Chapter 13 Alcohols, Phenols and Ethers
Chapter 14 Aldehydes and Ketones
Chapter 15 Carbox |
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c********r
发帖数: 2227 | 36 Kricheldorf, Hans R.; Bier, Gerhard. New polymer synthesis. IX. Synthesis
of poly(ether sulfone)s from silylated diphenols or hydroxybenzoic acids.
Journal of Polymer Science, Polymer Chemistry Edition (1983), 21(8),
2283-9. CODEN: JPLCAT ISSN:0360-6376. CAN 99:105825 AN 1983:505825
CAPLUS
Link：
http://www3.interscience.wiley.com/journal/104055585/abstract?CRETRY=1&SRETRY=0
非常感谢 |
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d**a
发帖数: 3715 | 37 Thank you for all of the replies. I ran this reaction by following the
literature. Some people used diethyl ether and claimed their product is
yellow (but didn't mentioned if they used hexane for purification or not). I
think my reaction was fine before hexane was added for extraction because
in both case, the resulting solutions are yellow. But I am not very sure
what is going on after hexane was added, which caused such a big change in
the solution color. |
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t***u
发帖数: 20182 | 39 都被研究过了，可以看文献，我记得chem rew有 |
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j***j
发帖数: 560 | 40 Chemistry Letters, 2008, 37, 202.
Microwave-assisted aromatic C-O bond formation: a rapid and efficient method
for the synthesis of aryl ethers
l***[email protected]
Thanks in advance. |
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d**********7
发帖数: 42 | 41 By Chen, Jung-Shou; Barton, Peter G.
Dialkyl ether phospholipids. I. Chemical synthesis of some model compounds
Bioorganic Medicinal Chemistry Letters 2005, 15, 5494
From Canadian Journal of Biochemistry (1970), 48(5), 585-93. Language:
English, Database: CAPLUS
The syntheses of 3 1, 2- dialkyl- sn- glycerol 3- phosphates and 1 new 1, 2-
dialkyl- sn- glycerol are described. 1, 2- Dioctadecyl- sn- glycerol 3-
phosphate was obtained by phosphorylation of 1, 2- dioctadecyl- sn- glycerol
with di- |
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j*********5
发帖数: 6221 | 44 倒是有可能，Ullmann里面有铜粉，是和PhCuI反应形成PhCu+CuI，是起到还原作用
不过从Ullmann-type ether formation reaction的催化机理看，Cu是不必需的，估计
是怕CuI被氧化失活，但是这样也会促进Ullmann经典反应，形成联苯吧 |
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