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I am studying for my CCNA, and I was wondering why we can't route packets between networks with MAC addresses. I have looked at other questions, and I can't seem to find the answer to this.
Because that would mean that every node in the network would have to know every mac address everywhere
think of it like this. IP routing is like routing by postal address
123 main st,
Big City
Ohio
USA
This is structured. Post office in California (where I mail this letter) doesnt know about 'main st' at all, but it knows to send to 'Big City' sorting office. They will know
MAC address is just a random number. That would be like mailing using SSN
Imagine a letter that said simply
354-76-8791
as the address, where would the post office send it when I mail it. They would need a registry of every SSN and where they live, updated all the time.
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So I happened to input "blue.com" into the browser to see if the domain was available. It timed out immediately, which I thought was odd, so I used tracert in the Windows console and saw it was equivalent to inputting localhost (resolves to 127.0.0.1).
It may be worth noting that green.com resolves to nothing, and is registered by MarkMonitor Inc, where blue.com is registered by Domain The Net Technologies Ltd. Both are domain management companies.
I cannot find anything online about this at all. Can anyone explain why blue.com resolves to localhost while other domains do not?
Any domain name can be registered to "point" or "resolve" to any IP address. This is done using what is called an "A Record" or "Address Record". Various other kinds of records can be found here.
In short, when someone registers a domain name as an "Address Record", they can choose any IP address they wish, including "127.0.0.1". Why Domain The Net Technologies chose to do so is something only they know, but technically there could be any number of domains which point to that address.
To learn more about how domain name servers work internally, check out this site which explains how you can make one yourself.
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Closed 5 years ago.
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Obviously the difference is that one can and one cannot access Netflix. But how does Netflix ban VPNs while not catching VPNs designed specifically to access Netflix?
The main difference is the question of whether Netflix knows about them yet or not.
In time, the VPNs which can access Netflix today will likely end up being blocked by from accessing the service when Netflix's analysis of incoming connections reveals IP addresses which could belong to VPNs used to circumvent their restrictions.
It is possible that some operators of VPN services may make use of IP addresses which are changed periodically to make detection less likely and this is how they may go for an extended period of time without being blocked.
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I was going through Russell's SS7 guide and was wondering what are SSP actually . Are these the telephone boxes we see on our streets or are they present inside telephone exchanges .
According to "Lan Tutorial With Glossary of Terms: A Complete Introduction to Local Area Networks (Lan Networking Library)" April, 1996:
SS7 messages originate at an SSP [Service Switching Point], which is a telephone switch that places or receives a call. The SSP is usually found at a telco's central office, but SS7 messages may also be used by an enterprise PBX. An ISDN PRI's D channel can also send messages that are compatible with SS7.
So not the little boxes, usually.
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Closed 7 years ago.
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The scene is under VMWare, and the os in vm is Ubuntu 12.
What I have to say is the network was actually suddenly cut off when I was coding. My two colleagues were all have the problem. It seems very odd. It just is a vm dev environment. Why three person will occur it in a not long time periods. I couldn't ping the IP in VM from my host, and vice versa.
At the first time, I think it is the problem of network adapter of VMware. But it didn't work after I removed the network adapter and re-added it.
But this time, I think ping it. But the network is very slow. I just ping a IP, not a domain.
So, when I used wireshark to see what is the problem.
As the picture show below. I think it is a virus. The random string before <00>.
Anyone can give me the solution or some hints? Thanks!!
Perhaps it's a virus called Chrome, from a company called "Google"; Chrome appears to make various weird name queries.
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I work for an IT company based in the US from home here in the UK. They currently have more available work in other departments, however they have told me that I will need a different public IP for each department. I am interested in working for 3 other departments, so I will need 3 new public IP's.
I am currently with virgin media fibre optic, so would I need to sign up with 3 new ISP's? So I could have virgin media fibre optic, sky fibre optic, bt broadband (phoneline) and talktalk (phoneline)
This is obviously going to cost me more, is there any other way I could achieve this? Maybe buy 3 new routers?
hey have told me that I will need a different public IP for each department. I am interested in working for 3 other departments, so I will need 3 new public IP's
This is off-topic for Stack Overflow, but I will respond...
Most providers will allow you to purchase more IP addresses from them for a modest price. In the US, I can buy them for about $15/additional address.
Another alternative is to find a virtual server hosting solution that allows you GUI console access over IP, as well as a dedicated virtual server IP address. If you go this route, you use the virtual server's IP address for your VPN connection, and drive the VPN session from the GUI console.