DNS lookup failing for LAN hosts with fixed DHCP leases

IPCop:

I am setting up an IPCop 2.1.9 machine for my home LAN.  I have created 
fixed DHCP leases for two workstations.  When I try to ping from one 
workstation to the other workstation, and vice-versa, DNS is failing:

2017-06-01 21:59:03 dpchrist@jesse ~
$ cat /etc/debian_version
8.8

2017-06-01 22:10:35 dpchrist@jesse ~
$ uname -a
Linux jesse 3.16.0-4-amd64 #1 SMP Debian 3.16.43-2 (2017-04-30) x86_64 
GNU/Linux

2017-06-01 22:10:37 dpchrist@jesse ~
$ ping -c 3 p43200
ping: unknown host p43200

2017-06-01 22:10:43 dpchrist@jesse ~
$ dig p43200

; <<>> DiG 9.9.5-9+deb8u11-Debian <<>> p43200
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 26967
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;p43200.				IN	A

;; AUTHORITY SECTION:
.			3600	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2017060102 
1800 900 604800 86400

;; Query time: 33 msec
;; SERVER: 208.67.222.222#53(208.67.222.222)
;; WHEN: Thu Jun 01 22:10:49 PDT 2017
;; MSG SIZE  rcvd: 110

2017-06-01 22:10:49 dpchrist@jesse ~
$ cat /etc/resolv.conf
# Generated by NetworkManager
search holgerdanske.com
nameserver 208.67.222.222
nameserver 208.67.220.220


If I use the IP address, it works:

2017-06-01 22:13:09 dpchrist@jesse ~
$ ping -c 3 192.168.5.32
PING 192.168.5.32 (192.168.5.32) 56(84) bytes of data.
64 bytes from 192.168.5.32: icmp_seq=1 ttl=64 time=0.381 ms
64 bytes from 192.168.5.32: icmp_seq=2 ttl=64 time=0.181 ms
64 bytes from 192.168.5.32: icmp_seq=3 ttl=64 time=0.207 ms

--- 192.168.5.32 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1998ms
rtt min/avg/max/mdev = 0.181/0.256/0.381/0.089 ms


I could add hosts entries on the workstations, but I'd rather let IPCop 
handle this for me (e.g. DHCP and DNS cache integration?).


I tried creating hosts entries on IPCop for the workstations, but that 
didn't work either.


Any comments or suggestions?


David

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