list computers in network

Is there a script/tool to list IPs of computers in my network,
something like ping all possible addresses and show which are
available?

On 6 Mar 2007 15:40:47 -0800, (E-Mail Removed) wrote:
> Is there a script/tool to list IPs of computers in my network,
> something like ping all possible addresses and show which are
> available?

man arp to see if dumping the arp cache to see if that works for you.

> man arp to see if dumping the arp cache to see if that works for you.

good idea... btw since I use DHCP is there a way to print which fixed-
address hosts are currently connected, like force to show them in
"dhcpd.leases"?

> man arp to see if dumping the arp cache to see if that works for you.

good idea... btw since I use DHCP is there a way to print which fixed-
address hosts are currently connected, like force to show them in
"dhcpd.leases"?

On 6 Mar 2007 16:11:20 -0800, (E-Mail Removed) wrote:
>> man arp to see if dumping the arp cache to see if that works for you.
>
> good idea... btw since I use DHCP is there a way to print which fixed-
> address hosts are currently connected, like force to show them in
> "dhcpd.leases"?

Hmm, guessing you failed to read the arp man page or I do not
understand what you want.


$ arp -i eth0
Address HWtype HWaddress Flags Mask Iface
fw.home.invalid ether 00:A0:CC:26:06:34 C eth0

$ arp -n -i eth0
Address HWtype HWaddress Flags Mask Iface
192.168.2.1 ether 00:A0:CC:26:06:34 C eth0

Where we find
$ cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=static <====== note the word static, means fixed.
IPADDR=192.168.2.1 <===== 3 guesses for that
NETMASK=255.255.255.0
ONBOOT=yes
METRIC=10
MII_NOT_SUPPORTED=no
USERCTL=no
RESOLV_MODS=yes
IPV6INIT=no
IPV6TO4INIT=no
LINK_DETECTION_DELAY=5
GATEWAY=76.184.128.1

On Tue, 06 Mar 2007 15:40:47 -0800, bbla32 wrote:

> Is there a script/tool to list IPs of computers in my network,
> something like ping all possible addresses and show which are
> available?

Have a look at nmap.

Dan

On Tue, 06 Mar 2007 15:40:47 -0800, bbla32 wrote:

> Is there a script/tool to list IPs of computers in my network,
> something like ping all possible addresses and show which are
> available?

ping -b

On Mar 7, 1:29 am, Bit Twister <BitTwis...@mouse-potato.com> wrote:
> On 6 Mar 2007 16:11:20 -0800, bbl...@op.pl wrote:
>
> >> man arp to see if dumping the arp cache to see if that works for you.
>
> > good idea... btw since I use DHCP is there a way to print which fixed-
> > address hosts are currently connected, like force to show them in
> > "dhcpd.leases"?
>
> Hmm, guessing you failed to read the arp man page or I do not
> understand what you want.

Thanks. I meant that I got arp working but I was wondering why DHCP
does not add to file "dhcpd.leases" computers defined like that in
"dhcpd.conf":
host xxx {
hardware ethernet ......;
fixed-address 192.168.0.3;
}

Thanks to everyone for answers!

On 7 Mar 2007 12:33:02 -0800, (E-Mail Removed) wrote:
>
> Thanks. I meant that I got arp working but I was wondering why DHCP
> does not add to file "dhcpd.leases" computers defined like that in
> "dhcpd.conf":
> host xxx {
> hardware ethernet ......;
> fixed-address 192.168.0.3;
> }

Ok, as I misunderstand your question with information so far,
what you see in the dhcpd.leases is the dhcp client format of the
lease sent from the dhcp server.

Now you indicated fixed ip address, so there should be no "lease" file
on that node. There may be one if the node was configured dynamic ip
at one time.
If so, lease date/timestamp info would show last time the file was updated.