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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: DHCP - DDNS Update (Darren Ankney) ---------------------------------------------------------------------- Message: 1 Date: Mon, 1 May 2023 06:26:32 -0400 From: Darren Ankney <darren.ank...@gmail.com> To: Users of ISC DHCP <dhcp-users@lists.isc.org> Subject: Re: DHCP - DDNS Update Message-ID: <cakabwhirbfuet4dyimbst4v5fkjdsofd2f1ydummk6d7jsg...@mail.gmail.com> Content-Type: text/plain; charset="utf-8" Hi, I have never personally setup DDNS in ISC DHCP, so I am not able to offer effective assistance in this area. ISC DHCP is now EOL, however, and if you are doing a new deployment here (it sounded like you were), you may want to consider starting with Kea (https://www.isc.org/kea/) as that is the replacement for ISC DHCP. On Tue, Apr 25, 2023 at 11:48?AM Jeremey Wise <jere...@cdw.com> wrote: > > Greetings, and sorry up front for large email. But joining this forum and > wanted to be comprehensive in my posting. I googled around and seems I am > not the only one with questions on how to do this task, as things have > changed with certs and updates. Hopefully this email formats in a means to > make it easy for others to review and toss out ideas / links to where I can > RTFM. > > I am being tasked to help out with a POC / Demo lab. It is a pair of VMs, > running Ubuntu 22.04 fully updated / patched. > > ### > dnsuser@ps-dns-01:~$ named -v > BIND 9.18.12-0ubuntu0.22.04.1-Ubuntu (Extended Support Version) <id:> > dnsuser@ps-dns-01:~$ apt list |grep dhcp > > WARNING: apt does not have a stable CLI interface. Use with caution in > scripts. > > dhcp-helper/jammy 1.2-3 amd64 > dhcp-probe/jammy 1.3.0-10.1build2 amd64 > dhcpcanon/jammy 0.8.5-2 all > dhcpcd-dbus/jammy 0.6.1-2 amd64 > dhcpcd-gtk/jammy 0.7.8-1 amd64 > dhcpcd5/jammy 7.1.0-2build1 amd64 > dhcpd-pools/jammy 2.29-1.1 amd64 > dhcpdump/jammy 1.8-2.2 amd64 > dhcpig/jammy 1.5-3 all > dhcping/jammy 1.2-5 amd64 > dhcpoptinj/jammy 0.5.3-1 amd64 > dhcpstarv/jammy 0.2.2-2 amd64 > dhcpy6d/jammy 1.0.7-1 all > freeradius-dhcp/jammy-updates,jammy-security > 3.0.26~dfsg~git20220223.1.00ed0241fa-0ubuntu3.1 amd64 > fusiondirectory-plugin-dhcp-schema/jammy 1.3-4build1 all > fusiondirectory-plugin-dhcp/jammy 1.3-4build1 all > golang-github-d2g-dhcp4-dev/jammy 0.0~git20150413-3 all > golang-github-d2g-dhcp4client-dev/jammy 1.0.0-2 all > golang-github-insomniacslk-dhcp-dev/jammy 0.0~git20200621.d74cd86-1 all > golang-github-mdlayher-dhcp6-dev/jammy 0.0~git20190311.2a67805-2 all > gosa-plugin-dhcp-schema/jammy 2.7.4+reloaded3-16build1 all > gosa-plugin-dhcp/jammy 2.7.4+reloaded3-16build1 all > isc-dhcp-client-ddns/jammy-updates 4.4.1-2.3ubuntu2.4 amd64 > isc-dhcp-client/jammy-updates,now 4.4.1-2.3ubuntu2.4 amd64 > [installed,automatic] > isc-dhcp-common/jammy-updates,now 4.4.1-2.3ubuntu2.4 amd64 > [installed,automatic] > isc-dhcp-dev/jammy-updates 4.4.1-2.3ubuntu2.4 amd64 > isc-dhcp-relay/jammy-updates 4.4.1-2.3ubuntu2.4 amd64 > isc-dhcp-server-ldap/jammy-updates 4.4.1-2.3ubuntu2.4 amd64 > isc-dhcp-server/jammy-updates,now 4.4.1-2.3ubuntu2.4 amd64 [installed] > kea-dhcp-ddns-server/jammy 2.0.2-1 amd64 > kea-dhcp4-server/jammy 2.0.2-1 amd64 > kea-dhcp6-server/jammy 2.0.2-1 amd64 > libnet-dhcp-perl/jammy 0.696+dfsg-1 all > libnet-dhcpv6-duid-parser-perl/jammy 1.01-2.1 all > librust-dhcp4r-dev/jammy 0.2.0-1 amd64 > libtext-dhcpleases-perl/jammy 1.0-2.1 all > neutron-dhcp-agent/jammy-updates 2:20.2.0-0ubuntu1 all > opendrim-lmp-dhcp/jammy 1.0.0-0ubuntu2 amd64 > python3-isc-dhcp-leases/jammy 0.9.1-2 all > udhcpc/jammy 1:1.30.1-7ubuntu3 amd64 > udhcpd/jammy 1:1.30.1-7ubuntu3 amd64 > wide-dhcpv6-client/jammy 20080615-23build1 amd64 > wide-dhcpv6-relay/jammy 20080615-23build1 amd64 > wide-dhcpv6-server/jammy 20080615-23build1 amd64 > dnsuser@ps-dns-01:~$ > ### > > > Goal: > > 1. HA DNS and DHCP (failover / fail back) > 2. DDNS updates from registered DHCP clients for PTR and A records > (ipv4 only for now) > > > Issues: > > 1. Getting flooding in /var/log/syslog , every update .. > > ### > Apr 25 14:51:34 ps-dns-02 dhcpd[202599]: DHCPACK on 10.89.132.129 to > 00:50:56:97:2b:f7 (op-web2) via 10.89.132.1 > Apr 25 14:51:34 ps-dns-02 dhcpd[202599]: bind update on 10.89.132.129 from > dhcpfailover rejected: incoming update is less critical than outgoing update > Apr 25 14:51:34 ps-dns-02 dhcpd[202599]: Unable to add forward map from > op-web2.ps.labs.local to 10.89.132.129: REFUSED > Apr 25 14:51:35 ps-dns-02 dhcpd[202599]: DHCPREQUEST for 10.89.132.130 > from 00:50:56:97:df:98 (easytravel) via ens160 > Apr 25 14:51:35 ps-dns-02 dhcpd[202599]: DHCPACK on 10.89.132.130 to > 00:50:56:97:df:98 (easytravel) via ens160 > Apr 25 14:51:35 ps-dns-02 dhcpd[202599]: DHCPREQUEST for 10.89.132.130 > from 00:50:56:97:df:98 (easytravel) via 10.89.132.1 > Apr 25 14:51:35 ps-dns-02 dhcpd[202599]: DHCPACK on 10.89.132.130 to > 00:50:56:97:df:98 (easytravel) via 10.89.132.1 > Apr 25 14:51:35 ps-dns-02 dhcpd[202599]: bind update on 10.89.132.130 from > dhcpfailover rejected: incoming update is less critical than outgoing update > Apr 25 14:51:35 ps-dns-02 dhcpd[202599]: bind update on 10.89.132.130 from > dhcpfailover rejected: incoming update is less critical than outgoing update > Apr 25 14:51:35 ps-dns-02 dhcpd[202599]: Unable to add forward map from > easytravel.ps.labs.local to 10.89.132.130: REFUSED > Apr 25 14:51:38 ps-dns-02 named[184617]: client @0x7f20082400b8 > 10.89.132.90#50112 (mdbrtr-cisco-assist-00-ps-labs-local-svc): query > (cache) 'mdbrtr-cisco-assist-00-ps-labs-local-svc/AAAA/IN' denied > (allow-query-cache did not match) > Apr 25 14:51:39 ps-dns-02 dhcpd[202599]: reuse_lease: lease age 122 (secs) > under 25% threshold, reply with unaltered, existing lease for 10.89.135.132 > Apr 25 14:51:39 ps-dns-02 dhcpd[202599]: DHCPREQUEST for 10.89.135.132 > from 00:50:56:8b:a5:85 via ens160 > ### > Similar posting was made with note that this would require configuration > file review for what was / is misconfigured: > https://dhcp-users.isc.narkive.com/KngCfNx3/rejected-incoming-update-is-less-critical-than-outgoing-update > > > As such below is sample of zone and DHCP /DNS configuration. > > I read through documents https://kb.isc.org/docs/aa-01588 But did not > see where their is misconfiguration in my configurations. > > cat /etc/dhcp/dhcpd.conf > ps-dns-01 ps-dns-02 > # option definitions common to all supported networks... > option domain-name "ps.labs.local"; > option domain-search "ps.labs.local"; > option domain-name-servers 10.89.100.152, 10.89.100.153; > option time-offset -6; > option ntp-servers 10.89.66.1; > option time-servers 10.89.66.1; > #ddns-domainname "ps.labs.local"; > default-lease-time 600; > max-lease-time 7200; > > > # Failover declaration > failover peer "dhcpfailover" { > primary; # primary server declaration > address 10.89.100.152; > port 647; > peer address 10.89.100.153; > peer port 647; > max-response-delay 60; > max-unacked-updates 10; > mclt 3600; > split 128; > load balance max seconds 3; > } > > > key pslabslocal { > secret cHNsYWJzbG9jYWw=; > algorithm hmac-md5; > } > > # The ddns-updates-style parameter controls whether or not the server will > # attempt to do a DNS update when a lease is confirmed. We default to the > # behavior of the version 2 packages ('none', since DHCP v2 didn't > # have support for DDNS.) > ddns-update-style standard; > > # If this DHCP server is the official DHCP server for the local > # network, the authoritative directive should be uncommented. > authoritative; > > # Use this to send dhcp log messages to a different log file (you also > # have to hack syslog.conf to complete the redirection). > #log-facility local7; > > # No service will be given on this subnet, but declaring it helps the > # DHCP server to understand the network topology. This is for local NIC > listening to dhcp broadcasts. > subnet 10.89.100.0 netmask 255.255.255.0 { > } > > # ps_labs_local_infrastructure > subnet 10.89.128.0 netmask 255.255.255.0 { > } > > # hx06 dynamic > subnet 10.89.130.0 netmask 255.255.255.0 { > option domain-name-servers 10.89.100.152; > option routers 10.89.130.1; > pool { > failover peer "dhcpfailover"; > range 10.89.130.10 10.89.130.254; > } > } > > # hx07 dynamic > subnet 10.89.132.0 netmask 255.255.255.0 { > option domain-name-servers 10.89.100.152; > option routers 10.89.132.1; > pool { > failover peer "dhcpfailover"; > range 10.89.132.10 10.89.132.254; > } > } > > # UCSX dynamic > subnet 10.89.134.0 netmask 255.255.255.0 { > option domain-name-servers 10.89.100.152; > option routers 10.89.134.1; > pool { > failover peer "dhcpfailover"; > range 10.89.134.10 10.89.134.254; > } > } > > # The following three network are for Tanzu work in hx06 > # Update 20221004 by JW. Data is all static as is mgmt. Workload is all > DHCP > # subnet 10.89.135.0 netmask 255.255.255.224 > > # k8s-tz-data-hx06 dynamic > subnet 10.89.135.0 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.152; > option routers 10.89.135.1; > pool { > failover peer "dhcpfailover"; > range 10.89.135.2 10.89.135.30; > } > } > > # k8s-tz-workload-hx06 dynamic > subnet 10.89.135.32 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.152; > option routers 10.89.135.33; > pool { > failover peer "dhcpfailover"; > range 10.89.135.34 10.89.135.63; > } > } > > # k8s-tz-mgmt-hx06 dynamic > subnet 10.89.135.64 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.152; > option routers 10.89.135.65; > pool { > failover peer "dhcpfailover"; > range 10.89.135.66 10.89.135.94; > } > } > > # k8s-ocp-data-hx06 > subnet 10.89.135.96 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.152; > option routers 10.89.135.97; > pool { > failover peer "dhcpfailover"; > range 10.89.135.98 10.89.135.126; > } > } > > # k8s-ocp-workload-hx06 > subnet 10.89.135.128 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.152; > option routers 10.89.135.129; > pool { > failover peer "dhcpfailover"; > range 10.89.135.130 10.89.135.158; > } > } > > # k8s-rke-mgmt-hx06 > subnet 10.89.135.160 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.152; > option routers 10.89.135.161; > pool { > failover peer "dhcpfailover"; > range 10.89.135.162 10.89.135.190; > } > # ocpbastion > host ocpbastion { > hardware ethernet 00:50:56:8b:db:a4; > fixed-address 10.89.135.190; > } > } > > # k8s-rke-data-hx06 > subnet 10.89.135.192 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.152; > option routers 10.89.135.193; > pool { > failover peer "dhcpfailover"; > range 10.89.135.194 10.89.135.222; > } > } > > # k8s-rke-workload-hx06 > subnet 10.89.135.224 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.225; > option routers 10.89.135.193; > pool { > failover peer "dhcpfailover"; > range 10.89.135.226 10.89.135.253; > } > } > > > # Host reservations > host tanzuprod-service-control-plane-bbwwb { > hardware ethernet 00:50:56:8b:71:bf; > fixed-address 10.89.135.48; > } > <snip> > host tanzuprod-workload-control-plane-zvm6t { > hardware ethernet 00:50:56:8b:75:83; > fixed-address 10.89.135.50; > } > > # DV Presales Lab > zone ps.labs.local. { > primary 10.89.100.152; > key pslabslocal; > } > > # option definitions common to all supported networks... > option domain-name "ps.labs.local"; > option domain-search "ps.labs.local"; > option domain-name-servers 10.89.100.152, 10.89.100.153; > option time-offset -6; > option ntp-servers 10.89.66.1; > option time-servers 10.89.66.1; > #ddns-domainname "ps.labs.local"; > default-lease-time 600; > max-lease-time 7200; > > > # Failover declaration > failover peer "dhcpfailover" { > secondary; # secondary server declaration > address 10.89.100.153; > port 647; > peer address 10.89.100.152; > peer port 647; > max-response-delay 60; > max-unacked-updates 10; > load balance max seconds 3; > } > > > key pslabslocal { > secret cHNsYWJzbG9jYWw=; > algorithm hmac-md5; > } > > # The ddns-updates-style parameter controls whether or not the server will > # attempt to do a DNS update when a lease is confirmed. We default to the > # behavior of the version 2 packages ('none', since DHCP v2 didn't > # have support for DDNS.) > ddns-update-style standard; > > # If this DHCP server is the official DHCP server for the local > # network, the authoritative directive should be uncommented. > authoritative; > > # Use this to send dhcp log messages to a different log file (you also > # have to hack syslog.conf to complete the redirection). > #log-facility local7; > > # No service will be given on this subnet, but declaring it helps the > # DHCP server to understand the network topology. This is for local NIC > listening to dhcp broadcasts. > subnet 10.89.100.0 netmask 255.255.255.0 { > } > > # ps_labs_local_infrastructure > subnet 10.89.128.0 netmask 255.255.255.0 { > } > > # hx06 dynamic > subnet 10.89.130.0 netmask 255.255.255.0 { > option domain-name-servers 10.89.100.152; > option routers 10.89.130.1; > pool { > failover peer "dhcpfailover"; > range 10.89.130.10 10.89.130.254; > } > } > > # hx07 dynamic > subnet 10.89.132.0 netmask 255.255.255.0 { > option domain-name-servers 10.89.100.152; > option routers 10.89.132.1; > pool { > failover peer "dhcpfailover"; > range 10.89.132.10 10.89.132.254; > } > } > > # UCSX dynamic > subnet 10.89.134.0 netmask 255.255.255.0 { > option domain-name-servers 10.89.100.152; > option routers 10.89.134.1; > pool { > failover peer "dhcpfailover"; > range 10.89.134.10 10.89.134.254; > } > } > > # The following three network are for Tanzu work in hx06 > # Update 20221004 by JW. Data is all static as is mgmt. Workload is all > DHCP > # subnet 10.89.135.0 netmask 255.255.255.224 > > # k8s-tz-data-hx06 dynamic > subnet 10.89.135.0 netmask 255.255.255.224 { > ddns-updates on; > option domain-name-servers 10.89.100.152; > option routers 10.89.135.1; > pool { > failover peer "dhcpfailover"; > range 10.89.135.2 10.89.135.30; > } > } > > # k8s-tz-workload-hx06 dynamic > subnet 10.89.135.32 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.152; > option routers 10.89.135.33; > pool { > failover peer "dhcpfailover"; > range 10.89.135.34 10.89.135.63; > } > } > > # k8s-tz-mgmt-hx06 dynamic > subnet 10.89.135.64 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.152; > option routers 10.89.135.65; > pool { > failover peer "dhcpfailover"; > range 10.89.135.66 10.89.135.94; > } > } > > # k8s-ocp-data-hx06 > subnet 10.89.135.96 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.152; > option routers 10.89.135.97; > pool { > failover peer "dhcpfailover"; > range 10.89.135.98 10.89.135.126; > } > } > > # k8s-ocp-workload-hx06 > subnet 10.89.135.128 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.152; > option routers 10.89.135.129; > pool { > failover peer "dhcpfailover"; > range 10.89.135.130 10.89.135.158; > } > } > > # k8s-rke-mgmt-hx06 > subnet 10.89.135.160 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.152; > option routers 10.89.135.161; > pool { > failover peer "dhcpfailover"; > range 10.89.135.162 10.89.135.190; > } > } > > # k8s-rke-data-hx06 > subnet 10.89.135.192 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.152; > option routers 10.89.135.193; > pool { > failover peer "dhcpfailover"; > range 10.89.135.194 10.89.135.222; > } > } > > # k8s-rke-workload-hx06 > subnet 10.89.135.224 netmask 255.255.255.224 { > option domain-name-servers 10.89.100.225; > option routers 10.89.135.193; > pool { > failover peer "dhcpfailover"; > range 10.89.135.226 10.89.135.253; > } > } > > # Host reservations > host tanzuprod-service-control-plane-bbwwb { > hardware ethernet 00:50:56:8b:71:bf; > fixed-address 10.89.135.48; > } > <snip> > host tanzuprod-workload-control-plane-zvm6t { > hardware ethernet 00:50:56:8b:75:83; > fixed-address 10.89.135.50; > } > > # DV Presales Lab > zone ps.labs.local. { > primary 10.89.100.152; > key pslabslocal; > } > dnsuser@ps-dns-02:~$ > > > > DDNS > > cat /etc/bind/named.conf > > ps-dns-01 ps-dns-02 > > include "/etc/bind/named.conf.options"; > include "/etc/bind/named.conf.local"; > include "/etc/bind/named.conf.default-zones"; > server 10.89.9.10 { > }; > server 10.89.9.107 { > }; > key pslabslocal { > algorithm hmac-md5; > secret "c<snip>w="; > }; > > include "/etc/bind/named.conf.options"; > include "/etc/bind/named.conf.local"; > include "/etc/bind/named.conf.default-zones"; > key pslabslocal { > algorithm hmac-md5; > secret "c<snip>w="; > }; > server 10.89.100.153 { > transfer-format many-answers; > keys { > pslabslocal; > }; > }; > > " /etc/bind/named.conf.options" > listen-on-v6 { any; }; > forwarders { > 10.89.9.10; > 10.89.9.107; > }; > recursion yes; > allow-query { > any; > }; > allow-recursion { > any; > }; > }; > "/etc/bind/named.conf.options" > options { > directory "/var/cache/bind"; > > > listen-on-v6 { any; }; > }; > "/etc/bind/named.conf.local" > zone "ps.labs.local" { > type master; > file "/var/lib/bind/ps.labs.local.hosts"; > also-notify { > 10.89.100.153; > }; > allow-transfer { > 10.89.100.153; > }; > }; > zone "128.89.10.in-addr.arpa" { > type master; > file "/var/lib/bind/10.89.128.rev"; > also-notify { > 10.89.100.153; > }; > allow-transfer { > 10.89.100.153; > }; > }; > zone "129.89.10.in-addr.arpa" { > type master; > file "/var/lib/bind/10.89.129.rev"; > also-notify { > 10.89.100.153; > }; > allow-transfer { > 10.89.100.153; > }; > }; > <snip other zones but all structured same> > "/etc/bind/named.conf.local" > zone "130.89.10.in-addr.arpa" { > type slave; > masters { > 10.89.100.152; > }; > allow-transfer { > 10.89.100.152; > }; > file "/var/lib/bind/10.89.130.rev"; > }; > zone "ps.labs.local" { > type slave; > masters { > 10.89.100.152; > }; > allow-transfer { > 10.89.100.152; > }; > file "/var/lib/bind/ps.labs.local.hosts"; > }; > zone "128.89.10.in-addr.arpa" { > type slave; > masters { > 10.89.100.152; > }; > allow-transfer { > 10.89.100.152; > }; > file "/var/lib/bind/10.89.128.rev"; > }; > <snip other zones but all structured same> > "/etc/bind/named.conf.default-zones" > > // prime the server with knowledge of the root servers > zone "." { > type hint; > file "/usr/share/dns/root.hints"; > }; > > // be authoritative for the localhost forward and reverse zones, and for > // broadcast zones as per RFC 1912 > > zone "localhost" { > type master; > file "/etc/bind/db.local"; > also-notify { > 10.89.100.153; > }; > allow-transfer { > 10.89.100.153; > }; > }; > > zone "127.in-addr.arpa" { > type master; > file "/etc/bind/db.127"; > also-notify { > 10.89.100.153; > }; > allow-transfer { > 10.89.100.153; > }; > }; > > zone "0.in-addr.arpa" { > type master; > file "/etc/bind/db.0"; > also-notify { > 10.89.100.153; > }; > allow-transfer { > 10.89.100.153; > }; > }; > > zone "255.in-addr.arpa" { > type master; > file "/etc/bind/db.255"; > also-notify { > 10.89.100.153; > }; > allow-transfer { > 10.89.100.153; > }; > }; > > > > "/etc/bind/named.conf.default-zones" > // prime the server with knowledge of the root servers > zone "." { > type hint; > file "/usr/share/dns/root.hints"; > }; > > // be authoritative for the localhost forward and reverse zones, and for > // broadcast zones as per RFC 1912 > > zone "localhost" { > type master; > file "/etc/bind/db.local"; > }; > > zone "127.in-addr.arpa" { > type master; > file "/etc/bind/db.127"; > }; > > zone "0.in-addr.arpa" { > type master; > file "/etc/bind/db.0"; > }; > > zone "255.in-addr.arpa" { > type master; > file "/etc/bind/db.255"; > }; > > > Questions: > > > 1. What is missconfigured to get flood of events about DHCP cache? > 2. Why are not DHCP leases pushing updates to DNS to create recoreds > (A and PTR) > 3. I see almost no logs as I boot up test Vm. and get lease.. as to > attempts to create from DHCP to DNS .. Where are the logs for these to > track down DDNS communication. > 4. DNS server on replica is not a flat file but a binary hash > replica. In event of failover (Ex: ps-dns-01) goes offline..) , how would > DHCP push via DDNS update records of server? > > > > > Thanks, > > > > Penguinpages > > > > -- > ISC funds the development of this software with paid support > subscriptions. Contact us at https://www.isc.org/contact/ for more > information. > > dhcp-users mailing list > dhcp-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/dhcp-users > -------------- next part -------------- An HTML attachment was scrubbed... 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