This article is the " TCP / IP of the Ming dynasty, the postman ," the prequel, you adults talk about Ming cabinet design is how TCP / IP networks.
Large Tianqi years, Tianqi Emperor Zhu from the school obsessed with carpentry, reuse eunuch Wei Zhongxian, not towards a long time.
Cabinet Cabinet Minister leaves adults worried about the hard times around the Ming dynasty, large tracts of barren land, robber, wild beasts, before the construction of the Official Road has been largely abandoned, not only not receive sent around the Memorial, yesterday finally rid themselves WeiZhongXian, face once met the emperor, but the request can not be issued an imperial edict even to the various prefectures, messenger postman have been robbed on the way, or missing!
Ye Grand Secretary decided to convene a cabinet meeting, how to establish a reliable, stable, smooth issued on the situation the mechanism under study.
VC
After listening to the adults to come to the meeting he said that the situation leaves Grand Secretary, frown all at once, the face of such a daunting challenge, no one wants to open, are shaking their heads could not sigh.
After a stick of incense effort, Korean adults continue to see the Grand Secretary of himself wink, had spoke: "Your honor, I have a premature idea, say we judge what the main problem now is rampant bandits, beasts. come and go, I think we can send our army, standing guard along the road, Buyi Kong, three a whistle, to establish a reliable protection to the Official Road. "
Zhu adults said: "This method is poor Korean adults carry me so much Guan Dao Ming, no amount of troops is not enough ah!."
Korean adults laughed: "Zhu adults, it seems you do not understand, I do not mean all the Official Road are on sentry cloth, but that we want to establish a connection channel!"
"Connection? What is the connection?" Zhu adults say "heard"
"If we have the capital to Kaifeng and communication, will go through the middle of town a lot, we just need to send a team of officers and soldiers, from the capital to Kaifeng road to protect it, so afraid of the bandits Butch, until The two sides communicate to an end, you can withdraw the army, to protect another communication channel, which is to establish a connection with the officers and men! "
Ye Shou Fu said: "Korean adults said makes sense, at least to solve the problem, but our main army were sent to deal with the Northeast Nurhachu to go, so we need and towns along the way, the Inn consultations, mainly so that they send troops, the capital and the army to establish a secure channel with. "
"In this case in a communication can take the safe path, very spacious, very reliable, but the cost is also high, in order to communicate once, have spent so many soldiers, and intermediate nodes have to negotiate." Zhu adults also learned abstract, creating the " intermediate nodes new word this."
Korean adults said: "ah, another point is that if the channel is temporarily not send a letter, then it is idle to waste ."
Ye Shou Fu said: "That is no way of things, so we have a trial period before it."
(Agricultural turn public code number NOTE: This is called a virtual circuit, the green part of the connecting channel, all messages are sent from the same channel)
Packet switching
"VC" to run for six months, and finally reluctantly issued on the situation, but was informed that WeiZhongXian, exaggeration of Emperor Zhu from the school said a lot of bad things, carpenter thunder emperor was furious, accusing the Cabinet waste of national manpower and resources, ordered to stop immediately .
Cabinet hated Wei Zhongxian, but had to stop.
On this day the emperor was not any on the audience was, we frown gather to discuss together.
Li Lang Sun Chengzong suddenly remembered one thing: "I heard that when border patrol Yuanchonghuan use a strange way to deliver supplies military affairs, he does not have troops standing guard in the Official Road, do not establish a secure connection, fully rely on horses, such livestock mule communicate. "
"How is it possible? Horses unreasonable human nature, get lost how to do?"
Sun Chengzong said: "His horses are trained, carry with them a letter or supplies, you can take on the Official Road, every town or to a post, a look inside runners letters destination, feed the horses, then Ma Guan Dao lead to the next can be a very easy way. of course, specific to the Official Road runners is determined, he will collect all kinds of information, determine the Official Road banditry less and less tigers. "
(Agricultural turn code Note: Similar post routers need to build a routing table, forwards the data packets)
"It's also not solve the problem, not the way to protect soldiers, horses may be put away, or being eaten by tigers and leopards, this material is still lost."
Sun Chengzong said: "This is Yuanchonghuan they thought, they invented a method called retransmission failure, if not receive an acknowledgment letter will be re-sent."
"The price is too high to resend it, after all, is the material ah!"
"Well, they generally put a large split into small pieces of material, because a horse can not pull much, then each small change to the number, which lost pieces, you send only the number, say Yuanchonghuan they man named 'magic on Hokyo' something, lost something from which you can then take out! "
"This is really a baby, ah, ah how could the average person."
(Spots missing person: thanks to friends Hokyo provides magic on this idea, I forget who it was, to see please contact me.)
Ye Shou Fu said: "But this is actually an interesting idea, does not require prior establishment of a genuine connection channels, each numbered piece of the road may go not the same , entirely up to the next path horses by runners who intermediate nodes which one. "
(Agricultural turn code Note: this is called packet switching )
Sun Chengzong added:. "Ye adults look very thorough, not only different paths, these pieces may also be out of order (out of order) arriving in this way he actually said intermediate node not undertake to provide reliable connectivity channels , supplies complete may be out of order, repetition, and even the loss of so-called reliable transport is fully implemented by two endpoints (such as capital and Kaifeng) . "
(Agricultural turn code Note: Meridian Gate capital Neixiang made to A1, A2, capital Deshengmenwai KaiFengFu transmitted to B1, B2, B3, packet path shown in the figure)
Korean adults: "The Grand Secretary adults, or we try, but we need to find ways to Magic on Hokyo did you get?."
Ye Shou Fu said: "We petitioned the emperor to let Yuanchonghuan Beijing debriefing, let him bring Hokyo, this time must let the emperor support, or else will die on the vine, I immediately palace, everyone waiting to hear it. "
(Finish)
PS: I will fight to write a prequel, Governor Yuan talk about is how to achieve failure retransmission.
