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流浪的蜘蛛~

Cao Charlie

职业
The architectural simplicity--In each thing, you reach the perfection, not when there is nothing left to add, but when there isnothing left to take off...
10月20日

IPTV方案的启发...

IPTV -- 电信增收之新篇章


1.IPTV不只是TV -- 金融,教学,购物...该上的都上吧
2.IPTV的三层结构 -- 应用支持层,网络支撑层,服务接收层 -- 网络支撑层乃是我们增收的新篇章呵
3.两张competing的网络 -- 有线电视网 & IP网络
4.IPTV业备对IP网络的要求:
        需要利用QOS利制保证带宽,f需要业务控制
        视频的安全性问题
        需要部署组播
        新型运维模型(网络监控)
                                                        ----唯一的优势在于其适合数据传送.....


5.问题:
        片面侧重于IPTV业务系及家庭终端的考虑,而忽略承载网络的作用
        仍然采用现有IP数据网络的建设及运营思路


6.Biggest Challenge No.1 -- 电信运维中需要更深层次的流量分析
                                                        ----电信运维的关键是要能精确控制不同业务对带宽资源的占用
7.Biggest Challenge No.2 -- 面对客户投诉(有马赛克,反应慢),如何快速定位问题和故障?
                                                        ----只在这个基础上才有大规模提供IPTV的可能性
8.Biggest Challenge No.3 -- 安全(灰色竞争 & DDoS)


9.思科的解决方案 No. 1 -- IP网三层结构里加了一层(业务感知控制层)
                                                        ----SCE (Service Control Platform)
10.思科解决方案 No. 2 -- Pre-emptive运维的思想
                                                        ----用SAA模拟仿真的手段得到网络每一跳 & 端到端的网络状况
                                                        ----用SAA模拟仿真的手段能确定问题是在客户接收端,承载网络里,还是在视频服务器上
11.思科解决方案 No. 3 -- 安全
                                                         ----灰色节目源控制和过滤 (感觉啥都没说呀...)
                                                         ----防DDOS攻击


12.对PPPoE的重新思考:
    认证在机顶盒和服务器之间已经完成,PPPoE认证就没有必要了
                                                         ----用DSLAM做隔离(TV+STB & PC),用VLAN TAG标记一个上IPTV网,一个上公网
                                                         ----PC还是用BRAS做终节,STB用DSLAM的DHCP Option82信息来定位
 双VC

好处: 在DSLAM设备上实现宽带网业务与IPTV业务分离采用专用链路连接到SR上,绕过BRAS
         采用DHCP OPTION82,配合ARP INSPECTION以及DHCP SERVER上层应用的安全控制技术,解决地址盗用和安全控制问题
         方便组播及QOS的部署
         适合在规模运营

 

13.如果业务扩展,考虑采用专有RPR环承载IPTV

美国案例


思科说到底还是NB呵...

8月16日

随笔(下雨,打不了网球了~)

1.思科对电信说,不要建MPLS网了,用QoS吧. --电信赚钱也不容易呀... 
 
2.思科说不要肓目做QoS,先得分析够了再做呀. --QoS, 原来IPFIX是基础...
 
3."Forwarding outages          < 3m (不用看其它的了,就这一条就知道此网有多变态了...)
      Packet Loss                    0.05% (不在设备里,而是光纤传输中)
      Packet Reordering            1%
      RTT US                          100ms (美国国内延迟)
      RTT World                      380ms (哥哥呀,岳阳光缆就有一万多公里呀)
      Jitter                             30ms (设备的缓存看来是不能少的)
      BW/Delay Quota              2.4G/350ms
      MTU                              4470B (Fragmentation越少越好了)"
                                                               --摘自"Sprintlink网站"
 
     大家不要报怨IP没有QoS了. --网络原来可以做得这么好的...感慨万千...
 
总结: 规划 --> 监控 -->  调整 --> 规划  == 完美的QoS
 
(鼓掌~ 噼里啪啦, 噼里啪啦~)
 
7月8日

Restlessness...

来印度好几天了,越来越觉得自己被一种restlessness的情绪包围...
 
 
6月14日

Words...

    A night when I don't feel like working, even though there are so much work pending. Don't know what happened, but my head just went blank... Yeah, don't wanna work...
 
    Spent some time online searching for nice songs to listen to, didn't find any, so fell back to listen to the oldies. I guess most of the time I feel like writing is when I feel negative and have to get the crap out of my chest.
 
     Let's see what happened since I came to work in Ruijie. Well, most of it was to prepare for DI training, and the VISA surely got a lot of people edgy and exhuasted. And there is this Arthur guy from Taiwan, who was definitely polite, even though, at times, I bet the only thing he felt was also edge and disappointment. Well, that reminds me of something else about this guy-- He talks slow... Which I "think" I've been trying to imitate at times... Why? Can't really say... Maybe for some guy that just graduated, I feel like the need to talk less and think more. Or maybe I wanna be more calm and don't wanna be agitated by my own "talking" -- if you talk fast, you would know what I mean...
 
    Anyway, the 3 months since I got here were busy. Besides DI, I get to monitor network testings in India from time to time. And I even went to Chengdu R&D Center to stimulate some field testings in India. Now let's see what I've learnt the most from the 3 months working in Ruijie???
 
    Yeah, big question mark~ can't answer that... At least not yet...
 
    Yesterday on my way out of the metro, I ran into a small stall besides a construction site selling original English novels. Gotta say I haven't touched those babies for a long time, yeah, since I got involved with this networking training program in college -- it was almost like I "quite" reading English novels. Anyway, I bought two books and kept the phone number of the street vendor -- it was Jack Welch's "Winning" and "A Beautiful Mind". The second book is about John Nash, the mathematical genius who came up with "Game Theory" and won a nobel prize in economics, and his life struggling with paranoid schizophrenia. On my way home, I kept thinking about my conversation with my sister the other day -- she told me about her idea of opening a language school in Hengyang. But she's in Germany, so we both know that's gonna take a while. What kept me occupied was the thought --"If I did go back home and open a language school with my sister, I would probably have all the time I need to READ." You know what? That just sounded so tempting in my head, and it sounds tempting even NOW~!
 
    Yeah, in my heart I know, for the moment, I need more insights into the networking industry, the knowledge and skills to survive... Damn, I miss those years of reading back in college, those crazy years~ I even thought I should go to a graduate school and study English literature -- well, that did almost happen...
 
    Kinda late now...
 
    Nighty nite, friends....
3月16日

流浪的蜘蛛~

今天鼓起勇气重开博客。
 
挺不容易的,一只蜘蛛从长沙流浪到武汉,从武汉流浪到深圳,从深圳流浪到福州--看样子还是要继续流浪下去。其实不为别的,只为这只蜘蛛想要变成大蜘蛛。其实我从小就恐惧蜘蛛,想不到长大了却变成了蜘蛛。
 
对以后的工作真没什么头绪,想着要和一帮印度阿三周旋,看着他们摇头是点头,吃饭用手抓还得一定用右手,用钱还得想着人民币和卢比怎么换,不然花钱还找不着感觉,最郁闷的是,不知道上哪里去找肉吃...到时候跟这么一帮人用英语讲技术,心里一个字--汗。。。不过我老爹倒是蛮happy的,还兴高采列的要帮我办护照。真是人不在江湖,不知江湖的苦啊。不对,应该是人不做蜘蛛,不知道蜘蛛织网的难啊...手里面还有一本书,不知道这几天能看完不。
 
为什么女人喜欢逛街,男人不喜欢呢?就算是女人上街帮男人买东西,男人也会觉得前途无光呢?不知道百度“知道”里可不可以搜得到答案的。。。
 
以后要多写写技术方面的心路历程,也好天下蜘蛛大家共同进步,能为社会织更好的网啊。。。
10月26日

Breathe Again...

Have you wondered how it feels when it's all over?
Wondered how it feels when you just have to start anew?
Never knowing where you are going,
when you face a brand new day.
It used to be that way...
 
I just wanna close my eyes and say,
I just wanna breathe again,
Learn to face the joy and pain.
Discover how to laugh a little,
cry a little,
live a little more.
 
I just wanna face the day,
forget about the woes of yesterday,
maybe if I hope a little,
try a little more,
I'll breathe again...
 
Starting out again is never easy,
disappointments come and go,
but life still moves on.
With a bit of luck, it's a brand new start,
it just might work my way,
no need to walk away.
Don't wanna live lives of replay.
......
                                   ---- Breathe Again

First heard the song many years ago, I still remember the first night I was listening to it. Yes, vividly.
There are just so many things in my head now, feeling just a little messed up.
A cigarette may help.
I'm not sad, actually I'm feeling kinda happy now, happy that my darling is with me.
For the whole time, I think I've been trying to be a little more positive and have a little more faith -- after it was lost. Sometimes I wonder why it's so easy to loss heart, to loss faith. Maybe it's just easy, but it doesn't really make things better. You say bad things about the world, but the world won't pity you and make things right for you. I know I tried to hide a lot, even now I still do that, but it's a lot less than before.
Things are difficult sometimes, but maybe we just need the "courage to live through the night, and see the break of dawn!"
Darling, I can't describe it. You are a very strong girl.
Your strength has had me feel some feelings, feelings of peace and happiness. I can feel it, feel you with me. Even though I feel tired out of working the whole day, my heart is quiet and powerful and full.
The cigarette is almost finished. Why it makes me feel more hungry? ...
Kisses and hugs, darling.
10月16日

Where is it?

Haven’t updated it for an awful long time – but suddenly sitting before the screen, I feel wordless and kinda paranoid.

 

Just lit a cigarette, yeah, does feel better now.

 

Lately it’s just been so easy to loss control – can’t exactly tell why.

 

Slowly I puff in and out the smoke, and try to put my mind in an easy place. Memories are flashing back and forth – I feel edgy and restless now.

 

Don’t know why I suddenly felt like writing, maybe it's just to keep myself from getting more "out-of-control". 

 

 

Will you hold on to me

I am feeling afraid

 

Will you hold on to me,

We will never fail

 

I want to be so perfect you see

I want to be so perfect…

 

Things will be fine...

 
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