On 23.07.2014 16:46, Marcel Holtmann wrote:
Hi Michael,
I think the lease should be remembered and reused in this case.
Hm, this sounds like a bug somewhere. When the new discover is sent
out it should send the same identifying information to the server, and
hence be given the same lease back again. Wireshark should tell you if
the fault is networkd's or the DHCP server.
I get the same address at first, but after several minutes the DHCP server
decides to offer a new address. I should note, that I have a 10 minute
lease time for debugging purposes, so that might make the problem more
prominent. I'll see if I can figure out what happens here.
look at your DHCP server and see what lease time it really hands out after
reboot.
However this is between you and your DHCP server. If you configure a lease time
of 10 minutes, then that is the only guaranteed time for a given IP address.
There is no mandate that the server has to give you the same address after 10
minutes when you ask again. It is valid to just get a different one. And that
many home routers try to give you back the same one does not mean that they are
required to do so.
The nice DHCP servers will remember your Ethernet address and/or identity
information and give you back your old IP address. Either with the left over
lease time or with a brand new lease time. There is really no need to store
this information on disk. If the lease expired the information on disk are
stale as well. And since our DHCP implementation is so fast, it makes really no
difference.
It is safer start out with a brand new DHCP lease instead of having to deal
with renewal during boot. At least that way you know the DHCP server is still
there and you have a valid IP address. Just re-using a stored IP with a
left-over lease is not safe anyway. You never know what changed in the network
when you were off.
Regards
Marcel
Exactly, let him configures static leases, and that's it.
http://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol
static allocation: The DHCP server allocates an IP address based on a
preconfigured mapping to each client's MAC address.
This feature is variously called static DHCP assignment by DD-WRT,
fixed-address by the dhcpd documentation,
address reservation by Netgear, DHCP reservation or static DHCP by Cisco and
Linksys,
and IP address reservation or MAC/IP address binding by various other router
manufacturers.
networkd fan club
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