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<p>We have not configured dhcp relay agent in both dhcp server's configuration .</p>
<p>In one of the server ,dhcp service listening on each interfaces.<br/>For another dhcp server ,dhcp relay agent is serving through Layer 3 switch.</p>
<p>But we are facing this issue for both the servers.</p>
<p>Regards,</p>
<p>Purva </p>
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<br/>On January 23, 2020 at 8:52 AM Bill Shirley <bill@c3po.polymerindustries.biz> wrote:
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<p>I stumbled upon your reply in my INBOX which I seldom check for this email account. I don't<br/> know which email client you're using but for Thunderbird you should use "Reply List".</p>
<p>Your tcpdump of the traffic for the working client <strong>is</strong> on the same subnet as your DHCP server:</p>
<span style="color: #993300;">10.208.39.250.bootpc > 10.208.38.1.bootps</span>
<p><br/> However, the two non-working clients appear to be <strong>off-subnet</strong>:</p>
<span style="color: #993300;">10.208.8.1.bootps > 10.208.0.27.bootps 10.208.16.1.bootps > 10.208.0.27.bootps </span>
<p>Are you using relays? What IP addresses does your DHCP server have?<br/> <span style="color: #993300;"><tt>ip -o -4 addr</tt><tt><br/> </tt></span><br/> Bill</p>
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On 1/20/2020 7:01 PM, Bill Shirley wrote:
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<p>Run a tcpdump on the network interface looking for DHCP traffic. Are there any responses?<br/> <span style="color: #993300;"><tt># IPv4</tt><tt><br/> </tt><tt>tcpdump -vv -e -n -i lan10 'portrange 67-68'</tt><tt><br/> </tt><tt># IPv6</tt><tt><br/> </tt><tt>tcpdump -X -l -vv -e -n -i wifi 'portrange 546-547'</tt><tt><br/> </tt></span><br/> Who is handling your logging? systemd-journald? rsyslogd?<br/> <br/> Bill</p>
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On 1/20/2020 12:17 AM, Purva Rawan wrote:
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<p align="LEFT"><span style="color: #242729;"><span style="font-family: Arial, 'Helvetica Neue', Helvetica,;"><span>Hi,</span></span></span></p>
<p align="LEFT"><span style="color: #242729;"><span style="font-family: Arial, 'Helvetica Neue', Helvetica,;"><span>We are using ISC-DHCP version is 4.1.1 on centos 6.4 .DHCP service started becoming unresponsive once every week . The server itself is up and running, but the DHCP service was unresponsive.We restarted the service. But after few days dhcp service stopped working. No entries were written to the dhcp log, and there was nothing helpful in any event log.We observed that Load on server ,CPU utilization ,HDD utilization,network traffic are normal during service get freeze.</span></span></span></p>
<p align="LEFT"><span style="color: #242729;"><span style="font-family: Arial, 'Helvetica Neue', Helvetica,;"><span>How to fix this issue?</span></span></span></p>
<p align="LEFT">Regards,</p>
<p align="LEFT">Purva </p>
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