Messing around with my network on Linux (looking for noob stuff, not complicated networking things that make my brain cry)
First of all, today, I had a comcast tech come by. He was incredibly unsuited to working with computers (he had to hunt and peck to type...), so unsurprisingly he had absolutely no idea what Linux was. He radioed for help, and the response was "uh.. linux is like... a software". Luckily, my mom's work box runs XP, but I'd like to be somewhat more informed in the future, plus have some fun. I googled for an equivalent of ipconfig /release and /renew, and got ifconfig up/down <device>, but it sounded like this was for that device, and that I had to do something else for the router. So my question is, how would I do this for the router? (Netgear, not in the mood to check the model right now so just let me know if you need that info) I've also been screwing around with ping and found a couple computers on my network where I'm unsure of what they are. One, is there a way to tell all of the devices on my local network? The "Attached Devices" page on my router doesn't show anything-- not even my physically-connected-to-the-damn-thing-by-a-cable computer. Two, is there a way to tell what a device is with it's IP address? Like have it report some information about itself? I'm running (a bastardized) Ubuntu 7.04, if that matters. I'd also be interested in any other fun easy-to-do LAN things. I'm easily amused, I still get giddy whenever I ssh to my main box from a laptop and open a text file in nano, so there has to be other fun things to do...
Well, there's a utility called nmap that will scan your subnet and report active addresses, and can then scan the open ports on those devices and by measuring how they respond, guess that the particular pattern suggests a certain device or operating system. That might be fun.
You want fun? You should see vi. It will make you cry. I won't harp on you this time, but usually, its considered rude to ask for help on hardware without providing information that would be easily availiable, like a model number. I use a Netgear FVS318v2, and on my router, It's three steps after I log in to it. http://img218.imageshack.us/img218/573/netgearreleaserenewws9.png Yeah, nmap is "a software" worth checking out. Even more fun would be to scan your local subnet in RR for web servers to see what your neighbors computers are hosting. nmap -p80 127.69.76.168/20 That would search your local subnet in roadrunner for webservers. I got /20 from the 255.255.240.0 subnet, and that IP address is the one the netgear gave as the public. Try it on your own. On 10/20/07, feba thatl <febaen@gmail.com> wrote:
First of all, today, I had a comcast tech come by. He was incredibly unsuited to working with computers (he had to hunt and peck to type...), so unsurprisingly he had absolutely no idea what Linux was. He radioed for help, and the response was "uh.. linux is like... a software". Luckily, my mom's work box runs XP, but I'd like to be somewhat more informed in the future, plus have some fun.
I googled for an equivalent of ipconfig /release and /renew, and got ifconfig up/down <device>, but it sounded like this was for that device, and that I had to do something else for the router. So my question is, how would I do this for the router? (Netgear, not in the mood to check the model right now so just let me know if you need that info)
I've also been screwing around with ping and found a couple computers on my network where I'm unsure of what they are. One, is there a way to tell all of the devices on my local network? The "Attached Devices" page on my router doesn't show anything-- not even my physically-connected-to-the-damn-thing-by-a-cable computer. Two, is there a way to tell what a device is with it's IP address? Like have it report some information about itself?
I'm running (a bastardized) Ubuntu 7.04, if that matters. I'd also be interested in any other fun easy-to-do LAN things. I'm easily amused, I still get giddy whenever I ssh to my main box from a laptop and open a text file in nano, so there has to be other fun things to do...
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--- Billy Crook <billycrook@gmail.com> wrote:
You want fun? You should see vi. It will make you cry.
I amused my first UNIX/Linux teacher by sticking a special wallpaper on the RedHat 6.0 Linux system I built as part of the classwork, in letters of fire on a black background (Script-Fu in the GIMP): VI VI VI The Number Of The Beast Once I figured out how to get into insert mode, how to delete lines, and how to save and quit, vi lost its horror. Granted, I did drop vi for Pico, and later Nano, the first chance I got. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
On Saturday 20 October 2007 06:01:22 pm Leo Mauler wrote:
Granted, I did drop vi for Pico, and later Nano, the first chance I got.
Thus missing the chance to learn the really cool equational editing tools embedded in vi. Poor you.
On 10/20/07, Jonathan Hutchins <hutchins@tarcanfel.org> wrote:
On Saturday 20 October 2007 06:01:22 pm Leo Mauler wrote:
Granted, I did drop vi for Pico, and later Nano, the first chance I got.
Thus missing the chance to learn the really cool equational editing tools embedded in vi. Poor you.
how do you do :.!fmt in nano?
On 10/20/07, Billy Crook <billycrook@gmail.com> wrote:
Yeah, nmap is "a software" worth checking out. Even more fun would be to scan your local subnet in RR for web servers to see what your neighbors computers are hosting.
nmap -p80 127.69.76.168/20
That would search your local subnet in roadrunner for webservers. I got /20 from the 255.255.240.0 subnet, and that IP address is the one the netgear gave as the public. Try it on your own.
When I first had access to roadrunner, I ran ethereal to find out what the stray packets working their way into my LAN were. (lots of arp requests.) TWC detected this somehow (perhaps dns lookups for internal routers? I don't know) and shut off our service until I talked with someone and promised not to do it again or something. Port scanning your neighbors is something that they really should detect, if they do or not.
I googled for an equivalent of ipconfig /release and /renew, and got
ifconfig up/down <device>, but it sounded like this was for that device, and that I had to do something else for the router. So my question is, how would I do this for the router? (Netgear, not in the mood to check the model right now so just let me know if you need that info)
netgears, as well as linksys and most other COTS routing appliances, use dynamic configuration over power-line protocol, which is one of the reasons you will not be allowed to bring your router with you if you have to spend the night in a hospital for any reason. Anyway, the easiest way to cause such a device to release and renew its lease is to momentarily disconnect it from the DCOPLP (pronounced "deek-o-plop") network by removing the black barrel shaped jack from its socket, counting backwards from 119 to zero by seventeens, and plugging it back in.
I meant to mention: chances are you're going to find a LOT of "web servers" on your local branch, in "filtered" state, likely these are the admin interface for the cable modem.
On Sunday 21 October 2007, Jonathan Hutchins wrote:
I meant to mention: chances are you're going to find a LOT of "web servers" on your local branch, in "filtered" state, likely these are the admin interface for the cable modem.
They wouldn't be filtered, and would be in the range of 10.x.x.x Most of them will gladly hand over their MAC address, allocated IPs, and other such information of questionable relevance. TWC's newest modems, however, have the interface return a null page.
On Sunday 21 October 2007, David Nicol wrote:
On 10/20/07, Billy Crook <billycrook@gmail.com> wrote:
Yeah, nmap is "a software" worth checking out. Even more fun would be to scan your local subnet in RR for web servers to see what your neighbors computers are hosting.
nmap -p80 127.69.76.168/20
That would search your local subnet in roadrunner for webservers. I got /20 from the 255.255.240.0 subnet, and that IP address is the one the netgear gave as the public. Try it on your own.
When I first had access to roadrunner, I ran ethereal to find out what the stray packets working their way into my LAN were. (lots of arp requests.) TWC detected this somehow (perhaps dns lookups for internal routers? I don't know) and shut off our service until I talked with someone and promised not to do it again or something. Port scanning your neighbors is something that they really should detect, if they do or not.
Nothing wrong with simple network sniffing or portscanners.
participants (6)
-
Billy Crook -
David Nicol -
feba thatl -
Jonathan Hutchins -
Leo Mauler -
Luke -Jr