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I am running DNSMasq as both my DHCP and DNS server on my DD-WRT router. I had thought that DNSMasq was adding hosts that it registered in DHCP to the DNS server automatically, but I have a few machines on my network that the DNS server claims that it can't find. What else do I need to do?
DNSMasq config (/tmp/dnsmasq.conf
):
interface=br0
resolv-file=/tmp/resolv.dnsmasq
all-servers
domain=domain
dhcp-leasefile=/tmp/dnsmasq.leases
dhcp-lease-max=144
dhcp-option=lan,3,0.0.0.1
dhcp-authoritative
dhcp-range=lan,0.0.0.100,0.0.0.200,255.255.0.0,1440m
stop-dns-rebind
dhcp-option= option:dns-server, 0.0.0.1 # DHCP option 006
server = 4.2.2.3
server = 4.2.2.4
server = 4.2.2.1
server = 4.2.2.2
DNSMasq leases file (/tmp/dnsmasq.leases
):
86400 00:00:00:00:00:01 0.0.0.101 host_fail *
86400 00:00:00:00:00:02 0.0.0.102 host_succeed *
Ping/nslookup results:
root@dd-wrt:~# ping host_succeed
PING host_succeed (0.0.0.102): 56 data bytes
64 bytes from 0.0.0.102: seq=0 ttl=64 time=2.138 ms
64 bytes from 0.0.0.102: seq=1 ttl=64 time=0.892 ms
--- host_succeed ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.892/1.515/2.138 ms
root@dd-wrt:~# ping host_fail
root@dd-wrt:~# nslookup host_succeed
Server: 0.0.0.1
Address 1: 0.0.0.1 dd-wrt.domain
Name: host_succeed
Address 1: 0.0.0.102 host_succeed
root@dd-wrt:~# nslookup host_fail
Server: 0.0.0.1
Address 1: 0.0.0.1 dd-wrt.domain
root@dd-wrt:~# cat /etc/hosts
127.0.0.1 localhost
0.0.0.1 dd-wrt.domain
root@dd-wrt:~# cat /etc/resolv.conf
search isp.net
search domain
nameserver 0.0.0.1
What could differ between host_fail and host_succeed? I doubt it, but does anything need to change on the client side? Does nslookup transmit any data to the host itself (rather than the DNS only)?
I earlier had issues with my client not sending a host name, but I believe that the router and leases now confirm that my client is doing that correctly.
What do I need to change to ensure that DNSMasq can serve DNS requests for these hosts to which its given DHCP leases?
Another cycle where an update broke this functionality, and then restored this functionality with a subsequent update happened for me. – palswim – 2015-07-27T22:04:20.777