Hi Fredrik,
thanks a lot for your answer.
At this point it's better to explain what is my need..
I'm developing a device which is both a DHCP server and a DNS server.
DNS hostnames are registered in the db basing on hostnames stated via DHCP
request message.
My worry is: if the device reboots, how to ask the devices to renew the
registration in order to appear among the DNS registered hosts?
I have to guarantee that remote hosts are always reachable... shall I go
for a custom solution?
Fabio
From: Fredrik Björk <f...@skulle.se>
To: net-snmp-users@lists.sourceforge.net
Date: 22/04/2014 21:24
Subject: Re: How to ask network hosts to renew their DHCP leases
Hi!
No, SNMP is not the way to go. I can't think of any device that can be
ordered to renew the IP address via an SNMP command. The two are simply
not that tightly related.
Clients generally renew the DHCP lease after half the lease time assigned
by the DHCP server. If that renewal fails, the client tries to renew in
half the remaining lease time and this process is repeated over and over
again until the lease time expires. The client then attempts a DHCP
DISCOVER. There are different approaches to this, but this is the most
common one. I don't know of any way to force the DHCP client to renew the
lease apart from CLI commands like Windows "ipconfig /renew" and various
Linux methods. If you need the clients to get a new address from the DHCP
server, you simply have to wait until the lease time expires.
/Fredrik
fabio.ma...@bticino.it skrev 2014-04-22 17:12:
Hi there,
I'm new to SNMP implementations, so please help me asking questions "the
right way" if needed.
After a DHCP server boots up, how can it send such a command (DHCP leases
renew) to network nodes?
Is SNMP the right way to do this?
Thanks in advance,
Fabio
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