2008/6/14 John Cornelius <[EMAIL PROTECTED]>: > Antonio M wrote: > >> I have a small LAN with DHCP running on Fedora 9. I checked the active >> leases: this is the list of active leases >> 1)I don't understand how IP address is connected to MAC address, i.e. if a >> MAC has already an IP address, should a new lease be started with same MAC >> address?? I see 5 IP's connected to same MAC address >> 2) How are the IP adressess released?? I would expect 192.168.0.63 < >> http://192.168.0.63> after 192.168.0.62 <http://192.168.0.62> and so >> on... (please note that 00:16:d4:dc:a7:08 sometimes is started by F9 and >> sometimes by F10 >> >> >> 200 IP addresses available, 6 allocated (3 %) >> >> IP Address Ethernet Hostname Start >> Date End Date >> 192.168.0.62 <http://192.168.0.62> 00:16:d4:dc:a7:08 acer >> 2008/06/11 07:07:52 2008/06/18 07:07:52 >> 192.168.0.224 <http://192.168.0.224> 00:16:d4:dc:a7:08 >> 2008/06/12 06:39:18 2008/06/19 06:39:18 >> 192.168.0.155 <http://192.168.0.155> 00:1a:80:23:e3:7b >> PC-contecsrl 2008/06/12 07:03:23 2008/06/19 07:03:23 >> 192.168.0.158 <http://192.168.0.158> 00:16:d4:dc:a7:08 >> 2008/06/13 07:47:01 2008/06/20 06:50:47 >> 192.168.0.241 <http://192.168.0.241> 00:16:d4:dc:a7:08 >> 2008/06/13 07:22:33 2008/06/20 07:22:33 >> 192.168.0.90 <http://192.168.0.90> 00:16:d4:dc:a7:08 >> 2008/06/13 07:47:01 2008/06/20 07:47:01 >> 192.168.0.155 <http://192.168.0.155> 00:1a:80:23:e3:7b >> PC-contecsrl 2008/06/13 07:50:57 2008/06/20 07:50:57 >> >> -- >> Antonio Montagnani >> Skype : antoniomontag >> >> > The problem arises because you seem to have an impractically long lease > time. Note that the lease issued on 2008/06/11 doesn't expire until > 2008/06/18 so your lease time seems to be 7 days. Most DHCP servers only > issue leases for 24 hours and those are renewed by the client after > (typically) 12 hours. > > Each of the IP addresses for your Acer probably represents a reboot of the > Acer. When the Acer boots it makes a DHCP request and the server makes > several checks to see if an address is in use and one of those checks is its > own database. If the address has already been assigned it selects another > and makes the test again. > > Apparently F9's DHCP server doesn't check to see if a MAC address is > already associated with an IP address lease that is unexpired so the best > thing to do is to shorten the lease time to something more practical, like > 86400 seconds (one day). That will clean out the database when the leases > expire. > > I have no idea why addresses are not assigned sequentially but usually > nobody cares. Perhaps the person coding it was having a bad day and wanted > to do something perverse. You can actually get better control over it by > reducing the size of the address space to a small multiple of the number of > machines on your network. From the DHCP listing it looks like there are only > 2 machines being serviced by DHCP so a reasonable number might be 16 or 32 > addresses instead of 200. > > John Cornelius > > > -- > fedora-list mailing list > [email protected] > To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list >
Tnx John and others I reduced lease time to 24 hr. I have still some comments: In the lease list I note today that only Fedora computers are repeated while Windows Vista is appearing only once!!! and I am pretty sure that it was connected to the network every morning. What is different between a Fedora computer and a Windows computer??? Or am I missing something??? -- Antonio Montagnani Skype : antoniomontag
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