Subject: RE: [dhcwg] Periodically check DHCPv4 server availability from re lay agent?

From: "Joe Aiello" <[email-masked]>
Date: Thu, 10 Jan 2002 08:31:00 -0800

You could send an arbitrary DHCP Request.  I have seen some clients do this
long before their renewal process should start.

Joe Aiello
Systems Engineer
Sylantro Systems

 -----Original Message-----
From: 	Mueller-Zimmermann Bernd
[mailto:[email-masked]] 
Sent:	Thursday, January 10, 2002 6:31 AM
To:	[email-masked]'
Subject:	[dhcwg] Periodically check DHCPv4 server availability from
relay agent?

Is there any DHCP v4 request to check, whether the server is responding?

We are programming a DHCP/bootp relay agent. Our relay agent talks to
an external DHCP server given by its IP address. We want to make the
information available to the local administrator, whether the external DHCP
server is "alive", whether it is responding. We want to periodically check
the availability, even if no client requests are currently being relayed.

From RFC 2131 and RFC 2132 I see nothing that could be used like a
"DHCP ECHO" request. Is there any DHCP request, that is guaranteed
to get a response from the server -- beside faking a client DISCOVER.
(Even negative responses would be o.k, just any reponse.)

Thanks a lot.

[email-masked]

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