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<p><span style="font-size: 9pt;">1.Rsyslogd is used for logging.</span></p>
<p>2.We faced the same issue again and captured logs for tcpdump command as suggested by you.It is observed that <br/>unresponsive dhcp server received only request in tcpdump but the same request is not logging in rsyslogd during the incident.</p>
<p>In working dhcp server ,we received both request and reply in tcpdump logs.</p>
<p>One more thing, we have ldap backend for dhcp configuration.</p>
<p>Here,I attached logs of tcpdump command for freeze dhcp service and working dhcp service.</p>
<p>Regards,</p>
<p>Purva</p>
<p> </p>
<p> </p>
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<br/>On January 21, 2020 at 5:31 AM Bill Shirley <bill@c3po.polymerindustries.biz> 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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