<br><br><div class="gmail_quote">On Tue, Aug 18, 2009 at 1:58 PM, Martin McCormick <span dir="ltr"><<a href="mailto:martin@dc.cis.okstate.edu">martin@dc.cis.okstate.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
We are suspecting that our failover pair may be out of sync on<br>
one of our wireless networks. Should both servers always log the<br>
DHCPDISCOVER packet from the same host even though only one will<br>
offer or has offered a lease?</blockquote><div><br>This is normal. Both servers should receive a request but only one should respond. <br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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We started noticing that clients in a wireless network<br>
were randomly getting 30-minute leases instead of the full lease<br>
time we had specified. </blockquote><div><br>What is your full lease time that you have specified? If you have it set to one hour <br>then the clients will attempt to renew their addresses after around 30 minutes.<br> </div>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">I began looking at the DHCPDISCOVER<br>
requests from a test system and noticed that there was one from<br>
the network in question in the syslog from the secondary DHCP<br>
server and never one from that network in the primary server.</blockquote><div><br>This may depend on your relay agents and what server they send the requests to.<br> <br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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Also, if one viewed /var/db/dhcpd.leases in the secondary<br>
server, the lease it was using was there. On the primary box,<br>
the last occurrence of that same address was an older lease that<br>
belonged to another client.</blockquote><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
<br>
Is there one thing in particular that is a dead giveaway<br>
that the DHCP servers are not seeing the same world?</blockquote><div><br>At the top of the leases file it should tell you the state of the failover peers.<br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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Thank you.<br>
<font color="#888888"><br>
Martin McCormick WB5AGZ Stillwater, OK<br>
Systems Engineer<br>
OSU Information Technology Department Telecommunications Services Group<br>
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