Смартсорсинг.ру

Сообщество руководителей ИТ-компаний, ИТ-подразделений и сервисных центров

Статьи в блогах Вопросы и ответы Темы в лентах ITSM 365 Пользователи Компании Лента заказов Курс по ITSM

Network Tunneling - why do we need it?

I have researched the topic of Network Tunnel but the information on this is rather confusing and inconsistent. So could someone please explain:
 
In general, What is tunneling? Is it simply an act of encapsulating a packet with another header and destine it to another point?
What is the purpose of tunneling? A switching or routing network is capable of delivering traffics, why then would you need a tunnel? What is the advantage?
 
Please help...
 
I didn't find the right solution from the Internet.
References
https://networkengineering.stackexchange.com/questions/43260/network-tunneling-why-do-we-need-it

 

Читать ответы

Unable to connect a game server using House Wifi

there's a game i played all the time working fine with my own house Wifi, then today they do a server maintainance for few hours. After that i try to connect the game server to update the game using my house Wifi but it failed. If i use my Phone internet hotspot to connect to the server it work fine. But my house Wifi is working fine too it can surf other Web perfectly only the game updates not working.....is there a possible way the Wifi has blockany update from outside? please i need advice....

Thank You!!!

I didn't find the right solution from the Internet.
References
http://www.tomshardware.com/answers/id-3496737/unable-connect-game-server-house-wifi.html

Читать ответы

Help looking for best Wifi modem for my needs.

So I'm looking to buy a Wifi Modem, I'm not sure where or what to start looking for. I am going to be getting my internet from Spectrum and I believe it will be 60Mbps. It will just be me living in the house. What I will have connected to it will be my IPhone, FireStick for streaming Movies and Tv with HD or even 1080p, I will also have my Xbox One for online gaming such as COD, GTA and such, I will have my tablet ( hardly use) but if I do use it it's for online banking and YouTube. I'm looking for something that will keep up with that without buffering or lag. 
 
I need a few suggestions on the best modem to buy for these needs because I have a list from the internet provider with the compatible models I...

Читать ответы

software update questions...AGAIN!

I know this seems like a repetitive question, and one there is probably no good answer to. So sorry in advance to ask what seems like a question that's already been answered.  I am still flying on the previous software (last update, not current update).  My base area is in Marina Del Rey, where I'm surrounded by airports. Are there people on the forum who have updated their software successfully, and are happy? Since it seems there is no recourse to retrograde, I'm concerned. And from what I am reading, it sounds like there are only CONS for upgrading. thank you... and people with happy stories, please let me know if there is something to be gained by upgrading? 

 

Thank You!!!

I didn't find the...

Читать ответы

Mean Variance Spanning test

Hi,
 
I am looking for a code for mean variance spanning test. This test was first proposed by Huberman & Kandel (1987) and recently Kan(2012) in his paper "Tests of Mean-Variance Spanning" has introduced spanning test based on GMM. 
 
Mean Variance spanning is a multivariate regression based test based on minimum variance framework. It is used to test whether adding assets to a portfolio will provide additional benefit or not. It tests the joint hypothesis of alpha = 0 and beta = 1 in the regression to test if the efficient frontier based on the original portfolio spans with the frontier of the new portfolio. If it spans then there is no benefit of adding the assets to the portfolio.
 
Please...

Читать ответы

Special Characters in postgres not saving

Hello 
 
Using alpha build 4932 on iis with postgres. I can't seem to get special characters to work. For example if I add ā to a text field and save it becomes a or ʻa becomes ?a. Does anyone have a solution to this. I am using the postgres 32 bit unicode driver. Iʻm pretty sure the issue is on the alpha side. If i paste the characters directly into the database it works or if i use the same driver to connect ms access directly to the database it works. I tried with both a varchar field and a text field.
 
Thank You!!!
 
I didn't find the right solution from the Internet.
References
https://www.alphasoftware.com/alphaforum/showthread.php?120781-Special-Characters-in-postgres-not-saving

Читать ответы

How to dynamically re-allocate serial buffer sizes?

I am using an RCM4100 or RCM4200 processor. For port D, for example, I know I must define the DINBUFSIZE AND DOUTBUFSIZE parameters, to say, 63 bytes. That works fine if I am using defines to alter the way the program compiles, but how do I dynamically change those values based on a DIP switch setting of my communications protocol? For example, what if I want 255 bytes for Modbus or 511 bytes for DF1 as set by a DIP switch input? Can I use malloc to change these and if so how?

Please help...

I didn't find the right solution from the Internet.
References
https://www.digi.com/support/forum/65027/how-to-dynamically-re-allocate-serial-buffer-sizes

Читать ответы

IPs- and FDQNs on localhost with subnets on MINT 17.3?

Hi,
 
I am searching how to setup certain IPs (IPv4) with two (or more) subnets on my localhost for testing and (still) not using virtual machines.
I have a Laptop which I am carrying around all the time traveling and I wonder how it is possible to set such an environment up for testing purposes; e.g. later a test and learning of a bacula, postfix, alfresco or a private CA-SSL, all based on the IPs and FDQNs.
 
I would like to set up a private subnet (class A).
 
I am still a bit confused how I map a domain on which IP and how I map two domains on one IP.
 
Could you suggest how I make it going?
 
Thank You!!!
 
I didn't find the right solution from the Internet.
References
...

Читать ответы

Probe Request frames in 802.11n

I have two questions about Probe Request frames in 802.11n:
 
1.On which rate are Probe Request frames sent in 802.11n? Is it fixed in the standard, or can it be tuneable?
 
2.Are Probe Request frames sent in older modulation techniques to support older 802.11 versions? I guess this should be the same as the other Management Frames.
 
Thank You!!!
 
I didn't find the right solution from the Internet.
References
https://networkengineering.stackexchange.com/questions/37448/probe-request-frames-in-802-11n

 

Читать ответы

How do I get this PC on my LAN?

I have 2 routers. One of which was provided by my ISP and essentially just sits in the living room as a modem in bridge mode. My other is an aftermarket router which has been flashed with DD-WRT, Linksys EA6500v1, if that's of any relevance.
 
I have a 50ft Ethernet cord running through the wall outlets into my room, powering my DD-WRT router's WAN port to create an unrestricted, full speed PPPoE connection of its own. This router is used for all Wi-Fi devices and nearby Ethernet devices, essentially acting as a primary Gateway router.
 
However, I have a desktop computer located in the living room where the ISP router is, and the only way it can get an internet connection is by hooking it up to the ISP router via...

Читать ответы