Which could be a good IP multicast for a free GPL application, free and usable, NOT to route traffic on the internet but that it remains within the private network of home?
Something in range 239.0.0.0/8 is usable? Not route traffic over internet?
Originally i think 224.23.45.78 but apparently it's reserved
Maybe just look here?
http://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml
Usually you would just use 224.0.0.1
Related
sorry my poor title but I don't know how to express my intention.
In ipv4 there are 2**32 addresses right?
and then if I send 1024 packets per second I could check all the devices of the internet in 1165 hours to create map of the internet. with it I want to make a topology of the internet
it's not that bad, if I go with multiple computers like raspberry pie it would be more faster.
if it's not me but somewhat organization or people and they have enough time, it could even scanning all the ports of all the devices of the internet..!
is my thought a daydream? or somebody already did it? please let me know! I'm curious
If you are interested in the actual physical location of an IP address, then there are many sources compiled already available, like the one here for free. Some are more accurate(commercial ones) than others.
If you just want to know if an IP address is alive or what services are available then you are out of luck as many of these "public" IP addresses are only accessible from whitelisted sources and/or heavily protected from folks like you trying to sniff around for profiling reasons.
If you would like to map out the topology of the Internet, you could get a view of the Autonomous Systems (collection of IP network addresses typically owned by ISPs or larger corporations) by looking at publicly accessible BGP looking glasses. BGP is the protocol that controls the routing of packets on the Internet. Please note that this is very dynamic and changes frequently due to the dynamic nature of path selection algorythms.
I am trying to create a setup for testing network equipment, and would like to use multiple (3) NICs in a single PC to produce traffic through an external device, i.e. a network switch. From one interface to another.
All of the tests are for IPv6 and ethernet. All NICs have link local and global IPv6 addresses with the same network/subnet prefix.
Atm. all packets are routed internally and never use the physical wire.
I see a lot of threads solving the problem for IPv4 using the net.ipv4.conf.all.accept_local parameter together with some routing table fixes. But I can't find a solution for IPv6.
Anyone know of a solution?
I have just installed an virtual Linux system. I was trying to access is from a different location but I could get trough.
When I have looked up the ip-address (ifconfig) on the system, which is:
inet addr: 10.0.2.15
but I still cant seem to manage it. Can anyone help?
It depends on virtualizing software you're using, but address pretty much looks like NATed. In that case you can't directly access it, unless you'll configure VM to map virtual network controller directly to host network.
What do you mean with different location? 10.x.x.x are private IP addresses, which can only be accessed within its subnet. What IP address does the host system have?
If the host system is within 192.168.x.x subnet, then an outside computer cannot know how to access 10.x.x.x when there is no route. You have then to set up NAT on your host computer.
A more easier approach would be to use bridged networking which will then eventually get an IP address through DHCP from your router (or whatever you might have).
I need to know when a specific pc (which I know ip and MAC) is plugged on the LAN. I want to avoid all polling mechanisms, is it possible under linux to achieve this ? Maybe by sniffing icmp packet?
Thx
If you are in control of the gateway, you can just sniff traffic and see if there's any from/to that host (through MAC or IP address).
If not, things get complicated, and some sort of polling is needed in most cases - in a switched network, you generally won't see the traffic destined for another host; the surest way of checking "online-ness" would be ARP, possibly by using arping (or doing the ARP requests yourself and sniffing the traffic for ARP replies).
Note that neither of these approaches are "sure-fire" - with tools like powernap, (temporarily) offline hosts can appear to be online.
You can use NMAP to scan your network with a simple ping type scan to see what hosts are online and not. This is a polling mechanism, but unless you can program the routers/switches in your network to tell your when MAC or IP address XYZ has started sending traffic, I don't know of any other way to do this.
Our customers are typical broadband home users, with a DSL Modem/Router which offers DHCP.
We want our device which is connected to the home LAN and has an embedded HTTP Server to be addressable with a domain name (www.mydevice.ip or something). In particular, we want to avoid that the user has to get the IP address and type it into the address bar of his browser.
What solutions are available?
Has the typical DHCP Modem a DNS included - how do you use it?
Could other services offer help (eg. Bonjour)?
You can use mDNS/DNS-SD using "avahi" daemon -- this should work on mac + linux hosts, and maybe for windows.
For Windows, you can set up SAMBA to get WINS name resolution.
A "typical DHCP Modem" is no standard so there is no default answer.
What you want, is that the modem works as a DNS cache (which is pretty much the default) and additionally add your own, static DNS entries that point to the IP of the entry.
How you achieve that depends on the router...