RE: [gentoo-user] [OT] Finding other machines on the network
Related to this, I had a similar situation when I setup up a 'turbonet' card on my TiVo. I built and evolved this web UI: http://daevid.com/examples/dhcp/ Source is at bottom of the page. I find it useful to see who's on my network. My linux box is the firewall and dhcp server. It uses 'arp'. Works well for my needs. YMMV. -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
On Tue, 2005-08-30 at 17:51 -0500, John Jolet wrote: On Aug 30, 2005, at 4:57 PM, Christoph Gysin wrote: John Jolet wrote: yeah, if it's got a firewall disallowing icmp responses. then you can do nmap -P0 to find it. ping would never find it. It's gotta have SOME port open. As far as I've read his post, there's no firewall involved. So why should he do portscans in all hosts on the subnet? Also, nmap can do os fingerprinting and probably show you which one is the solaris or sunos machine... Sure, but that's not what he's looking for... perhaps I read the initial post wrong...I was under the impression that he had a headless sun box with a static ip on a known subnet, but the exact ip wasn't known. ... what about arp? Just a thought Frank -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
On Wed, 2005-08-31 at 08:38 +0200, Frank Schafer wrote: On Tue, 2005-08-30 at 17:51 -0500, John Jolet wrote: On Aug 30, 2005, at 4:57 PM, Christoph Gysin wrote: John Jolet wrote: yeah, if it's got a firewall disallowing icmp responses. then you can do nmap -P0 to find it. ping would never find it. It's gotta have SOME port open. As far as I've read his post, there's no firewall involved. So why should he do portscans in all hosts on the subnet? Also, nmap can do os fingerprinting and probably show you which one is the solaris or sunos machine... Sure, but that's not what he's looking for... perhaps I read the initial post wrong...I was under the impression that he had a headless sun box with a static ip on a known subnet, but the exact ip wasn't known. ... what about arp? That was the answer given in an alomst identical problem recently on this list (or was it another??) arp will rely on the box having actually done something within arp's cache period. if there is no network activity, there may be no arp entry. Just a thought Frank -- Nick Rout [EMAIL PROTECTED] -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
Nick Rout wrote: On Wed, 2005-08-31 at 08:38 +0200, Frank Schafer wrote: On Tue, 2005-08-30 at 17:51 -0500, John Jolet wrote: On Aug 30, 2005, at 4:57 PM, Christoph Gysin wrote: John Jolet wrote: yeah, if it's got a firewall disallowing icmp responses. then you can do nmap -P0 to find it. ping would never find it. It's gotta have SOME port open. As far as I've read his post, there's no firewall involved. So why should he do portscans in all hosts on the subnet? Also, nmap can do os fingerprinting and probably show you which one is the solaris or sunos machine... Sure, but that's not what he's looking for... perhaps I read the initial post wrong...I was under the impression that he had a headless sun box with a static ip on a known subnet, but the exact ip wasn't known. ... what about arp? That was the answer given in an alomst identical problem recently on this list (or was it another??) arp will rely on the box having actually done something within arp's cache period. if there is no network activity, there may be no arp entry. Just a thought Frank ping broadcast ? -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
On Wed, 2005-08-31 at 16:42 +0800, Destromy wrote: ping broadcast ? now we are going in circles. not every device responds to ping - its optional in linux and people often turn it off because of various DOS attacks based on icmp. also some OSes don't seem to respond to broadcast ping, even though they respond to ping to their own address, windows being an example. So, all techniques in this thread seem to have validity, but not all of them will work in all circumstances. -- Nick Rout [EMAIL PROTECTED] -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
On Aug 31, 2005, at 1:38 AM, Frank Schafer wrote: ... what about arp? If this machine has the mac address listed on the outside of the case, or he opens it up to look at the card, sure. if you don't know what the mac address isthen you're stuck. Of course, if it's a small, home network, you could always just turn off all the other computers except that one and the one you're on and ask the router who's connected. be quicker just to launch nmap and go get some coffee. -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
On Wed, 2005-08-31 at 05:50 -0500, John Jolet wrote: On Aug 31, 2005, at 1:38 AM, Frank Schafer wrote: ... what about arp? If this machine has the mac address listed on the outside of the case, or he opens it up to look at the card, sure. if you don't know what the mac address isthen you're stuck. Not necessarily. If the machine has had network activity it may be shown by arp -e. If you have a smallish network and can identify the other machines, its a matter of elimination. i.e. you look at the list of IP addresses shown by arp -en and eliminate the ones you know. Of course, if it's a small, home network, you could always just turn off all the other computers except that one and the one you're on and ask the router who's connected. be quicker just to launch nmap and go get some coffee. -- Nick Rout [EMAIL PROTECTED] -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
Andrew Lowe wrote: Hi all, I have the situation where I've been loaned an old Sun SPARC box for some work. It has a static IP somewhere in the 192.168.0.* range, which my home network also is in. My question is, how can I find out the IP address of the machine? if it is pingable then emerge fping and fping -g 192.168.0.0/24 -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
Hi Nick, on Wednesday, 2005-08-31 at 20:30:14, you wrote: arp will rely on the box having actually done something within arp's cache period. What's more, ARP resolves IP addresses to MAC addresses and the IP address is what the OP wanted to find out in the first place. I'd try in this order: 1. Broadcast ping 2. for n in `seq 1 254`; do ping /dev/null -c1 -W1 192.168.0.$n; \ [ $? == 0 ] echo $n is up; done 3. nmap cheers! Matthias -- I prefer encrypted and signed messages. KeyID: 90CF8389 Fingerprint: 8E 1F 10 81 A4 66 29 46 B9 8A B9 E2 09 9F 3B 91 pgpbm2KbnPfNZ.pgp Description: PGP signature
Re: [gentoo-user] [OT] Finding other machines on the network
If some other machine wants to communicate with some second other machine ... say secmachine.homenet.com it connects to the DNS server of homenet.com. (This step won't be done if IP addresses are in use. The DNS server then sends the IP address to firstmachine.homenet.com or firstmachine uses the known one. Next firstmachine will broadcast an ARP whois ip.of.sec.srv request. sec.srv or secmachine will answer with an ARP reply which contains the IP and the MAC address. Firstmachine then initiates the communication using this MAC address. Don't forget. The transport layer is ETHERNET. There don't exist IP addresses. Just for clarification. arp will do exactly this and arpd can even collect such information because every machine on a subnet will see all of the requests and replies. Regards Frank On Wed, 2005-08-31 at 05:50 -0500, John Jolet wrote: On Aug 31, 2005, at 1:38 AM, Frank Schafer wrote: ... what about arp? If this machine has the mac address listed on the outside of the case, or he opens it up to look at the card, sure. if you don't know what the mac address isthen you're stuck. Of course, if it's a small, home network, you could always just turn off all the other computers except that one and the one you're on and ask the router who's connected. be quicker just to launch nmap and go get some coffee. -- gentoo-user@gentoo.org mailing list
[gentoo-user] [OT] Finding other machines on the network
Hi all, I have the situation where I've been loaned an old Sun SPARC box for some work. It has a static IP somewhere in the 192.168.0.* range, which my home network also is in. My question is, how can I find out the IP address of the machine? I've forgotten what it is and it's also headless with no keyboard. Is there a utilitiy in portage that will try all of the ip addresses in a range and let me know if something it at the other end, ie something like automatically pinging all of the addresses in a range and reporting what addresses responded? Any thoughts greatly appreciated, Andrew -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
emerge nmap On Tuesday 30 August 2005 09:51, Andrew Lowe wrote: Hi all, I have the situation where I've been loaned an old Sun SPARC box for some work. It has a static IP somewhere in the 192.168.0.* range, which my home network also is in. My question is, how can I find out the IP address of the machine? I've forgotten what it is and it's also headless with no keyboard. Is there a utilitiy in portage that will try all of the ip addresses in a range and let me know if something it at the other end, ie something like automatically pinging all of the addresses in a range and reporting what addresses responded? Any thoughts greatly appreciated, Andrew -- John Jolet Your On-Demand IT Department 512-762-0729 www.jolet.net [EMAIL PROTECTED] -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
On Wed, 2005-08-31 at 00:51 +1000, Andrew Lowe wrote: Hi all, I have the situation where I've been loaned an old Sun SPARC box for some work. It has a static IP somewhere in the 192.168.0.* range, which my home network also is in. My question is, how can I find out the IP address of the machine? I've forgotten what it is and it's also headless with no keyboard. Is there a utilitiy in portage that will try all of the ip addresses in a range and let me know if something it at the other end, ie something like automatically pinging all of the addresses in a range and reporting what addresses responded? Nmap is what you want. It can do far more advanced things, too. But to do a simple ping sweep (and portscan anything that it finds, which will then reveal the IP): nmap -T4 -F 192.168.0.* You may need to tell it 192.168.0.0/24 instead. -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
Dienstag 30 August 2005 16:51, Andrew Lowe: Is there a utilitiy in portage that will try all of the ip addresses in a range and let me know if something it at the other end, ie something like automatically pinging all of the addresses in a range and reporting what addresses responded? if it pings: nmap -sP 192.168.0.1-254 hth pgpX0LUEDAIaJ.pgp Description: PGP signature
Re: [gentoo-user] [OT] Finding other machines on the network
Andrew Lowe wrote: Hi all, I have the situation where I've been loaned an old Sun SPARC box for some work. It has a static IP somewhere in the 192.168.0.* range, which my home network also is in. My question is, how can I find out the IP address of the machine? I've forgotten what it is and it's also headless with no keyboard. Is there a utilitiy in portage that will try all of the ip addresses in a range and let me know if something it at the other end, ie something like automatically pinging all of the addresses in a range and reporting what addresses responded? Any thoughts greatly appreciated, Andrew If it reply to broadcast query this can give an answer: #ping -b -c1 192.168.0.255 well, many answer, exclude the known ip and try the remaining ones. -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
yeah, if it's got a firewall disallowing icmp responses. then you can do nmap -P0 to find it. ping would never find it. It's gotta have SOME port open. Also, nmap can do os fingerprinting and probably show you which one is the solaris or sunos machine... On Tuesday 30 August 2005 10:12, Christoph Gysin wrote: Andrew Lowe wrote: Hi all, I have the situation where I've been loaned an old Sun SPARC box for some work. It has a static IP somewhere in the 192.168.0.* range, which my home network also is in. My question is, how can I find out the IP address of the machine? I've forgotten what it is and it's also headless with no keyboard. Is there a utilitiy in portage that will try all of the ip addresses in a range and let me know if something it at the other end, ie something like automatically pinging all of the addresses in a range and reporting what addresses responded? Any thoughts greatly appreciated, Andrew A simple for loop around ping would do the trick. Am I missing something? Christoph -- echo mailto: NOSPAM !#$.'*'|sed 's. ..'|tr * !#:2 [EMAIL PROTECTED] -- John Jolet Your On-Demand IT Department 512-762-0729 www.jolet.net [EMAIL PROTECTED] -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
On 30 August 2005 15:51, Andrew Lowe wrote: Hi all, I have the situation where I've been loaned an old Sun SPARC box for some work. It has a static IP somewhere in the 192.168.0.* range, which my home network also is in. My question is, how can I find out the IP address of the machine? I've forgotten what it is and it's also headless with no keyboard. Is there a utilitiy in portage that will try all of the ip addresses in a range and let me know if something it at the other end, ie something like automatically pinging all of the addresses in a range and reporting what addresses responded? Can't you remote log in and do ifconfig? Uwe -- 95% of all programmers rate themselves among the top 5% of all software developers. - Linus Torvalds http://www.uwix.iway.na (last updated: 20.06.2004) -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
John Jolet wrote: yeah, if it's got a firewall disallowing icmp responses. then you can do nmap -P0 to find it. ping would never find it. It's gotta have SOME port open. As far as I've read his post, there's no firewall involved. So why should he do portscans in all hosts on the subnet? Also, nmap can do os fingerprinting and probably show you which one is the solaris or sunos machine... Sure, but that's not what he's looking for... Christoph -- echo mailto: NOSPAM !#$.'*'|sed 's. ..'|tr * !#:2 [EMAIL PROTECTED] -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] [OT] Finding other machines on the network
On Aug 30, 2005, at 4:57 PM, Christoph Gysin wrote: John Jolet wrote: yeah, if it's got a firewall disallowing icmp responses. then you can do nmap -P0 to find it. ping would never find it. It's gotta have SOME port open. As far as I've read his post, there's no firewall involved. So why should he do portscans in all hosts on the subnet? Also, nmap can do os fingerprinting and probably show you which one is the solaris or sunos machine... Sure, but that's not what he's looking for... perhaps I read the initial post wrong...I was under the impression that he had a headless sun box with a static ip on a known subnet, but the exact ip wasn't known. -- gentoo-user@gentoo.org mailing list
