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SIP 网络电话

June 22nd, 2005 by congyuan

再跟大家说说使用这个网络电话的心得。

其实不用硬件电话(Hardware Phone),一样是可以达到同样的通话效果。用硬件电话的好处就是不依赖电脑。来电话了不用手忙脚乱的找耳机麦克风。。。

试过了两个软电话(Software Phone),X-Lite和pulver.Communicator。他们都支持通用的Codec,如:PCMU(G.711U), PCMA(G.711A), G723, GSM等。其中G.711可以提供较好的通话效果。

用过这两个软件后,发觉pulver.Communicator (以下简称pC)好用。

1. 通话效果好过X-Lite (用X-Lite可以明显感觉到断断续续的声音,而用pC就跟用硬件电话差不多)
2. pC容易与FWD使用(因为pC本身就是为FWD所特设的,根本不需要自己设置什么。而X-Lite要自己设置Network Settings)

硬件电话目前只用过一个Grandstream BT101。物美价廉。。。呵呵。在eBay上USD60就可以买到。

另外说一下用软电话跟硬电话兼容的问题。开始的时候的确有个问题:就是用Grandstream打过来的,用pC接听,Grandstream方可以听到,但是pC方听不到对方。这就是所谓的one-way audio问题。后来发觉是pC软件里的一个设定:DTMF sent when initiating an audio call。默认设定是 “7″。在这个默认设定下,对方会听到Beep一声。把它改成”Tweak Microphone”就解决了one-way audio问题。

Posted in 电脑网络, Linksys WRT54G, VOIP | No Comments »

Cisco Total Network Security Seminar | 30th June 2005, M-Hotel Singapore

June 21st, 2005 by congyuan

DATE : 30th June 2005, Thursday

TIME : 9.00 am -12.00 pm
Registration commences
at 8.30 am

VENUE : M Hotel Singapore
81 Anson Road
Singapore 079908

RSVP : Kindly RSVP before
23 June 2005
Via Web : Click here
Via Phone : Ms Sarah Anne Pinto
Telephone: 6723 3828

Cisco has just shifted the goalposts on total network security. The ASA 5500 series is a revolutionary solution that your customers - from enterprise to small business - are going to queue up for. It’s simpler to deploy, very flexible and extremely cost efficient. For the first time ever, the ASA 5500 series covers all bases in a single platform - market-proven firewall, Intrusion Protection System, network anti-virus and Virtual Private Network capabilities.

With just one security appliance to install and manage, customers can economically roll out comprehensive security services right across their organisation - home office, small office, branch office, head office. And they don’t have to make risky trade-offs between robust security protection and the operational costs associated with multiple devices in numerous locations.

Don’t miss the opportunity to discover first-hand how the ASA 5500 series can simplify and safeguard the network and generate great sales opportunities for you. Rizwan Qureshi, PM for PIX & ASA, Cisco Systems (US), will be hosting the seminar. Rizwan will introduce the ASA 5500 series and demonstrate how the ASA series of security appliances adapt to evolving threats without new platforms or performance degradation.

Register now to secure your spot. This new product is generating a lot of interest and places are limited.

Posted in 电脑网络 | No Comments »

查找Spyware的好帮手

June 13th, 2005 by congyuan

如果你的电脑经常有pop-up广告出来,即使在没有开IE的情况下,那么就先试一下那些现成的Anti-spyware软件,如Microsoft的,还有Ad-aware。

不过现在的spyware都很厉害,一般的软件根本对付不了。介绍一个查看当前进程,及registry的软件:Hijackthis

在Google上搜一下就很容易找到下载。

Hijackthis的作用是检查spyware常修改的地方

  • 如windows的开机就启动的进程,在注册表里的Run部分
  • 当前进程(process)所对应的相应exe文件
  • IE的插件,首页设定等
  • DNS的设定

如果发现可疑的entry,可以在Google上搜一下相应的exe文件,看看是不是正常的程序。如果不是,就有很大的可能是spyware。最好是去到所在的目录,删掉!

所以真正解决一个讨厌的pop-up有时候不是件容易的事。Hijackthis可以帮忙找出可疑的exe文件,和可疑的注册表entry。

Spyware通常隐藏的很巧妙,但是最终他们的藏身之处都是在Hijackthis的检查范围内。所以人工辨认比现成的Anti-spyware智能多了。

Posted in 电脑网络, Spyware | No Comments »

又有签唱会。。。Energy

June 12th, 2005 by congyuan

今天在CCK LOT 1 的广场上有Energy告别新加坡的签唱会。大概10点多就已经排了好长的队,从麦当劳绕过7/11,一直排到Postoffice那边。

好久没见过这样的场面了。以前也跟sand去过两场签唱会,呵呵。感觉就是累啊。有大太阳晒的话就更苦啦。排上3,4个小时还算正常吧。现在已经没有这个心情了。怎么说也经历过吧,没什么后悔

Posted in 心情闲聊 | No Comments »

congyuan.com

June 11th, 2005 by congyuan

对这个域名窥视已久…….

Posted in 电脑网络 | No Comments »

在家里看世界。。

June 8th, 2005 by congyuan

http://worldwind.arc.nasa.gov/

一个软件,可以看通过卫星拍的照片。

看看自己的家吧,或者世界任何一个角落。不是实时更新的。

不过只有US的才有高分辨率的图片。其他世界各地的照片可能是1999-2003年拍摄的。

Singapore Map

Posted in 电脑网络 | No Comments »

Websites can track your internal IP address

June 6th, 2005 by congyuan

http://www.auditmypc.com/whats-my-ip.asp

http://www.auditmypc.com/internal-ip.html

第一次看到自己的internal IP 被显示出来,真是觉得震惊。。。

Posted in 电脑网络 | No Comments »

SMS.ac 邀请。。。

June 5th, 2005 by congyuan

最近又收到来自SMS.ac的邀请。其实我对SMS.ac的做法最可恨的是,它要求你输入你的Hotmail的用户名和密码。所以我就不明白为什么很多人都乖乖的在SMS.ac的网页上输入了Hotmail信息的密码

很多用户不知不觉就上了当,输入了真实的密码后,SMS.ac就用你的密码登陆Hotmail,拿到你的Contact List,结果就是你的朋友收到SMS.ac的 spam mail.

通常的invitation email 是这样的:
img src=”http://congyuan.mylivy.net/blog/images/smsac_spam.jpg” alt=”SMS.ac Spam Mail” />

然后如果你点了其中的链接,就会到了它的网页,它提示说“Use your Hotmail for best results”
SMS.ac Sign up

如果你输入了hotmail的email address,下一步就是要你的密码。
SMS.ac Ask for Hotmail Password

所以启示是:Never give your Hotmail password on NON-Hotmail website.

Posted in 电脑网络 | No Comments »

困扰很久的在Linux下FTP问题

June 1st, 2005 by congyuan

经常发现有的网站的FTP不能连接上,可以登陆,但是总是停在某个地方.如用gFTP:

220---------- Welcome to Pure-FTPd [TLS] ----------
220-You are user number 2 of 250 allowed.
220-Local time is now 01:16. Server port: 21.
220 You will be disconnected after 4 minutes of inactivity.
USER xxxxx
331 User xxxxx OK. Password required
PASS xxxx
230-User xxxxx has group access to:  xxxxx
230 OK. Current restricted directory is /
TYPE I
200 TYPE is now 8-bit binary
CWD /
250 OK. Current directory is /
PASV
227 Entering Passive Mode (66,29,3,66,231,25)
LIST

就停在上面一行.

试过disable Passive Mode,结果是一样.如下:

220---------- Welcome to Pure-FTPd [TLS] ----------
220-You are user number 1 of 250 allowed.
220-Local time is now 01:20. Server port: 21.
220 You will be disconnected after 4 minutes of inactivity.
USER xxxxxx
331 User xxxxx OK. Password required
PASS xxxx
230-User xxxxxx has group access to:  xxxxxx
230 OK. Current restricted directory is /
TYPE I
200 TYPE is now 8-bit binary
PWD
257 "/" is your current location
PORT 192,168,42,77,157,42

试过别的如ncFTP, 还有Linux的ftp command,都是同样的结果.

同一个网络,用windows的WS_FTP就没有问题.Log file如下:

220---------- Welcome to Pure-FTPd [TLS] ----------
220-You are user number 2 of 250 allowed.
220-Local time is now 01:22. Server port: 21.
220 You will be disconnected after 4 minutes of inactivity.
USER xxxxxx
331 User xxxxxx OK. Password required
PASS (hidden)
230-User xxxxxx has group access to:  xxxxxx
230 OK. Current restricted directory is /
PWD
257 "/" is your current location
Host type (I): UNIX (standard)
PORT 192,168,42,17,4,196
200 PORT command successful
LIST
150 Connecting to port 61682
Received 1471 bytes in 0.1 secs, (140.00 Kbps),
transfer succeeded
226-Options: -a -l
226 22 matches total

以上是没有使用Passive Mode.即时是enable Passive Mode, windows下也没有类似的问题.

Posted in FTP Server | No Comments »

和尚募捐

June 1st, 2005 by congyuan

今天早上下楼,一个高个的和尚走过来,伸手递给我一张画着佛像的牌(符),说是送给我保平安.我接过就要走,他又说让我留个名,掏出了一个小本子.我这才发现是要我捐钱的.我二话没说就把符还给他就走了.小本子上写着有人捐40的…

现在的和尚开口不直接说捐钱了,聪明着呢.

Posted in 牢骚太盛防肠断 | No Comments »

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