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To subscribe or unsubscribe via the World Wide Web, visit https://lists.isc.org/mailman/listinfo/dhcp-users or, via email, send a message with subject or body 'help' to dhcp-users-requ...@lists.isc.org You can reach the person managing the list at dhcp-users-ow...@lists.isc.org When replying, please edit your Subject line so it is more specific than "Re: Contents of dhcp-users digest..." Today's Topics: 1. Re: Reg: dhcp service unresponsive frequently (Bill Shirley) 2. Re: Reg: dhcp service unresponsive frequently (Purva Rawan) ---------------------------------------------------------------------- Message: 1 Date: Mon, 20 Jan 2020 19:01:54 -0500 From: Bill Shirley <b...@c3po.polymerindustries.biz> To: dhcp-users@lists.isc.org Subject: Re: Reg: dhcp service unresponsive frequently Message-ID: <a36d920a-ff8a-2d62-3feb-080ded4f8...@c3po.polymerindustries.biz> Content-Type: text/plain; charset="utf-8"; Format="flowed" Run a tcpdump on the network interface looking for DHCP traffic. Are there any responses? # IPv4 tcpdump -vv -e -n -i lan10 'portrange 67-68' # IPv6 tcpdump -X -l -vv -e -n -i wifi 'portrange 546-547' Who is handling your logging? systemd-journald? rsyslogd? Bill On 1/20/2020 12:17 AM, Purva Rawan wrote: > > Hi, > > 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. > > How to fix this issue? > > Regards, > > Purva > > > > For assimilation and dissemination of knowledge, visit cakes.cdac.in > > 150th Anniversary Mahatma Gandhi > > ------------------------------------------------------------------------------------------------------------ > [ C-DAC is on Social-Media too. Kindly follow us at: > Facebook: https://www.facebook.com/CDACINDIA & Twitter: @cdacindia ] > > This e-mail is for the sole use of the intended recipient(s) and may > contain confidential and privileged information. If you are not the > intended recipient, please contact the sender by reply e-mail and destroy > all copies and the original message. Any unauthorized review, use, > disclosure, dissemination, forwarding, printing or copying of this email > is strictly prohibited and appropriate legal action will be taken. > ------------------------------------------------------------------------------------------------------------ > > _______________________________________________ > dhcp-users mailing list > dhcp-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/dhcp-users -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.isc.org/pipermail/dhcp-users/attachments/20200120/92f43bd9/attachment-0001.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.jpg Type: image/jpeg Size: 7789 bytes Desc: not available URL: <https://lists.isc.org/pipermail/dhcp-users/attachments/20200120/92f43bd9/attachment-0001.jpg> ------------------------------ Message: 2 Date: Tue, 21 Jan 2020 17:11:15 +0530 (IST) From: Purva Rawan <pur...@cdac.in> To: Bill Shirley <b...@c3po.polymerindustries.biz> Cc: Users of ISC DHCP <dhcp-users@lists.isc.org> Subject: Re: Reg: dhcp service unresponsive frequently Message-ID: <36589077.12368.1579606875707.javamail.open-xcha...@webmail.cdac.in> Content-Type: text/plain; charset="utf-8" 1.Rsyslogd is used for logging. 2.We faced the same issue again and captured logs for tcpdump command as suggested by you.It is observed that unresponsive dhcp server received only request in tcpdump but the same request is not logging in rsyslogd during the incident. In working dhcp server ,we received both request and reply in tcpdump logs. One more thing, we have ldap backend for dhcp configuration. Here,I attached logs of tcpdump command for freeze dhcp service and working dhcp service. Regards, Purva On January 21, 2020 at 5:31 AM Bill Shirley <b...@c3po.polymerindustries.biz> wrote: > > Run a tcpdump on the network interface looking for DHCP traffic. Are there > any responses? > # IPv4 > tcpdump -vv -e -n -i lan10 'portrange 67-68' > # IPv6 > tcpdump -X -l -vv -e -n -i wifi 'portrange 546-547' > > Who is handling your logging? systemd-journald? rsyslogd? > > Bill > > On 1/20/2020 12:17 AM, Purva Rawan wrote: > > > > > > Hi, > > > > 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. > > > > How to fix this issue? > > > > Regards, > > > > Purva > > > > > > > > For assimilation and dissemination of knowledge, visit cakes.cdac.in > > > > [150th Anniversary Mahatma Gandhi] > > > > > > > > ------------------------------------------------------------------------------------------------------------ > > [ C-DAC is on Social-Media too. Kindly follow us at: > > Facebook: https://www.facebook.com/CDACINDIA > > <https://www.facebook.com/CDACINDIA> & Twitter: @cdacindia ] > > > > This e-mail is for the sole use of the intended recipient(s) and may > > contain confidential and privileged information. If you are not the > > intended recipient, please contact the sender by reply e-mail and > > destroy > > all copies and the original message. Any unauthorized review, use, > > disclosure, dissemination, forwarding, printing or copying of this > > email > > is strictly prohibited and appropriate legal action will be taken. > > > > > > ------------------------------------------------------------------------------------------------------------ > > > > _______________________________________________ > > dhcp-users mailing list > > dhcp-users@lists.isc.org <mailto:dhcp-users@lists.isc.org> > > https://lists.isc.org/mailman/listinfo/dhcp-users > > <https://lists.isc.org/mailman/listinfo/dhcp-users> > > > > > _______________________________________________ dhcp-users mailing list dhcp-users@lists.isc.org https://lists.isc.org/mailman/listinfo/dhcp-users ------------------------------------------------------------------------------------------------------------ For assimilation and dissemination of knowledge, visit cakes.cdac.in [ C-DAC is on Social-Media too. Kindly follow us at: Facebook: https://www.facebook.com/CDACINDIA & Twitter: @cdacindia ] This e-mail is for the sole use of the intended recipient(s) and may contain confidential and privileged information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies and the original message. Any unauthorized review, use, disclosure, dissemination, forwarding, printing or copying of this email is strictly prohibited and appropriate legal action will be taken. ------------------------------------------------------------------------------------------------------------ -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.isc.org/pipermail/dhcp-users/attachments/20200121/9c788f0e/attachment.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.jpg Type: image/jpeg Size: 7789 bytes Desc: not available URL: <https://lists.isc.org/pipermail/dhcp-users/attachments/20200121/9c788f0e/attachment.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.jpg Type: image/jpeg Size: 7789 bytes Desc: not available URL: <https://lists.isc.org/pipermail/dhcp-users/attachments/20200121/9c788f0e/attachment-0001.jpg> -------------- next part -------------- 16:30:41.329356 00:11:20:93:46:80 > 08:00:27:ba:ca:41, ethertype IPv4 (0x0800), length 590: (tos 0x0, ttl 255, id 25251, offset 0, flags [none], proto UDP (17), length 576) 10.208.8.1.bootps > 10.208.0.27.bootps: [udp sum ok] BOOTP/DHCP, Request from d8:d3:85:b4:7f:a8, length 548, hops 1, xid 0x89585500, secs 58014, Flags [none] (0x0000) Gateway-IP 10.208.8.1 Client-Ethernet-Address d8:d3:85:b4:7f:a8 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Discover Parameter-Request Option 55, length 10: Subnet-Mask, Default-Gateway, Domain-Name-Server, Domain-Name BR, Static-Route, Vendor-Option, Netbios-Name-Server RN, RB Lease-Time Option 51, length 4: 259200 Hostname Option 12, length 14: "ILOSGH011X3VE^@" MSZ Option 57, length 2: 576 Vendor-Class Option 60, length 7: "CPQRIB3" Client-ID Option 61, length 7: ether d8:d3:85:b4:7f:a8 16:30:41.795777 00:11:20:93:46:80 > 08:00:27:ba:ca:41, ethertype IPv4 (0x0800), length 328: (tos 0x0, ttl 255, id 25253, offset 0, flags [none], proto UDP (17), length 314) 10.208.16.1.bootps > 10.208.0.27.bootps: [udp sum ok] BOOTP/DHCP, Request from 00:11:74:88:c3:cf, length 286, hops 1, xid 0xdebe4749, secs 1619, Flags [none] (0x0000) Gateway-IP 10.208.16.1 Client-Ethernet-Address 00:11:74:88:c3:cf Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Discover Client-ID Option 61, length 7: ether 00:11:74:88:c3:cf Requested-IP Option 50, length 4: 10.208.17.246 MSZ Option 57, length 2: 576 Parameter-Request Option 55, length 7: Subnet-Mask, Default-Gateway, Domain-Name-Server, Hostname Domain-Name, BR, NTP Vendor-Class Option 60, length 12: "udhcp 1.20.2" -------------- next part -------------- 16:30:06.019007 00:50:56:bc:03:b2 > 00:1f:29:5c:a2:62, ethertype IPv4 (0x0800), length 342: (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 328) 10.208.39.250.bootpc > 10.208.38.1.bootps: [udp sum ok] BOOTP/DHCP, Request from 00:50:56:bc:03:b2, length 300, xid 0x67c1f617, Flags [none] (0x0000) Client-IP 10.208.39.250 Client-Ethernet-Address 00:50:56:bc:03:b2 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Request Hostname Option 12, length 12: "eci-slave3.1" Parameter-Request Option 55, length 16: Subnet-Mask, BR, Time-Zone, Classless-Static-Route Domain-Name, Domain-Name-Server, Hostname, YD YS, NTP, MTU, Option 119 Default-Gateway, Classless-Static-Route, Classless-Static-Route-Microsoft, NTP 16:30:06.081563 00:1f:29:5c:a2:62 > 00:50:56:bc:03:b2, ethertype IPv4 (0x0800), length 342: (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 328) 10.208.38.1.bootps > 10.208.39.250.bootpc: [bad udp cksum d2dc!] BOOTP/DHCP, Reply, length 300, xid 0x67c1f617, Flags [none] (0x0000) Client-IP 10.208.39.250 Your-IP 10.208.39.250 Client-Ethernet-Address 00:50:56:bc:03:b2 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: ACK Server-ID Option 54, length 4: 10.208.38.1 Lease-Time Option 51, length 4: 20 Subnet-Mask Option 1, length 4: 255.255.254.0 Time-Zone Option 2, length 4: 23400 Domain-Name Option 15, length 12: "pune.cdac.in" Domain-Name-Server Option 6, length 8: 10.208.0.11,10.208.11.16 Default-Gateway Option 3, length 4: 10.208.38.1 ------------------------------ Subject: Digest Footer _______________________________________________ dhcp-users mailing list dhcp-users@lists.isc.org https://lists.isc.org/mailman/listinfo/dhcp-users ------------------------------ End of dhcp-users Digest, Vol 135, Issue 12 *******************************************