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I know that routers are used to send data between distinct networks, but am wondering if they recognize what type of data (i.e., image, emails) they are transmitting.
No, generally routers know service type instead of data type because of well-known ports. Routes focus on how to forward bytes between different networks, a problem like which path is better.
Let's take a look at tcp/ip protocol. Router is a device operates at the 3rd layer(internet). Only processes that work in application layer do care data type.
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I'm testing a Media Server and I need to make multiple SIP calls on the same time. I used microSIP but I failed to find how to launch it with multiple instances. Is any way to launch several instances of microSIP on the same Windows7?
Do you know any other sip client with multiple instances? Linphone doesn't works on my Windows7.
Just copy MicroSIP folder to different folders locations and launch separately
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In which protocol does router use to advertise itself and the network(including the name of the netwrok, like hotspot)?
I haven't found it on the interent, do you have any ideas?
If you refer to Wireless APs, they advertise themselves using the IEEE 802.11 standard. Particularly, beacon frames are used. You can check these frames on Wireshark captures: https://wiki.wireshark.org/SampleCaptures#Wifi_.2F_Wireless_LAN_captures_.2F_802.11
On the other hand, if you mean over the wire, as you have been already told, they do not advertise their name. In IPv6 there is the NDP protocol which advertises routers, but not their names. However, you can use reverse DNS query to obtain the DNS name of a router, so maybe you refer to that.
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Closed 6 years ago.
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When I do socket programming, I found at least one computer has to have a public IP to make the connection (or reverse connection). I'm wondering if it is possible for 2 computers that are behind different routers to connect to each other (and they don't have port forwarding and don't use proxy)? If that's not possible, how bit torrent works for computers that are behind routers? Does it mean the computers that are behind different routers cannot share among each other?
Bittorent clients are using a protocol named uPNP, that tells router to redirect specified port in bittorrent client to computer that runs client.
Here is more information about protocol.
https://en.wikipedia.org/wiki/Universal_Plug_and_Play
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Closed 8 years ago.
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so I am planning to make a network analyzer using Perl. But before I start I have to answer this question, can a Perl program actually sniff packets in multiple NICs simultaneously? a feature of the program im going to make is that it needs to sniff the packets in the whole LAN within a switch. Is this possible in Perl?
Sniffing packets in the whole lan is not possible. It is only possible if your switch supports it. Many swith has an option to copy all traffic to one of its port for monitoring/sniffing.
http://en.wikipedia.org/wiki/Port_mirroring
http://www.miarec.com/knowledge/switches-port-mirroring
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let's say I have a 2-Mbyte chip and need to construct a 8-Mbyte memory. I need to show the address lines in a diagram and explain what the address lines are used for. How would I go about doing this?
If I remember correctly you could make it with 4 2-Mbyte chips.
The first 2 bits of the address are used to select which chip you need. Then the rest of the address is sent to the selected chip.