[Dnsmasq-discuss] One LAN host reported differently for some reason - why?

[Simon Kelley]

On 01/12/11 15:09, Chris Green wrote:
> I have a simple dnsmasq set-up running on a small home LAN.
>
> The server that runs dnsmasq has the following in its /etc/hosts file:-
>
>      127.0.0.1       localhost
>
>      # The following lines are desirable for IPv6 capable hosts
>      ::1     localhost ip6-localhost ip6-loopback
>      fe00::0 ip6-localnet
>      ff00::0 ip6-mcastprefix
>      ff02::1 ip6-allnodes
>      ff02::2 ip6-allrouters
>      ff02::3 ip6-allhosts
>      #
>      #
>      # Systems with static addresses, dnsmasq distributes these to the others
>      #
>      192.168.1.1 vigor 2820n
>      192.168.1.2 dps dps.zbmc.eu
>      192.168.1.3 hp7310 HPEDDBB7 HP000D9D068F7D
>      192.168.1.4 chris wiki boat info
>      192.168.1.5 maxinexp
>      192.168.13.254 2wire BT2700HGV gateway.2wire.net
>
> The /etc/dnsmasq.conf file has only one custom addition:-
>
>      dhcp-host=00:90:a9:70:06:ff,backup
>
>
> However, when I ask for the addresses of machines on the LAN wiki is
> reported differently for some reason:-
>
>      chris$ host chris
>      chris.zbmc.eu has address 192.168.1.4
>      chris$ host wiki
>      wiki.zbmc.eu has address 192.168.1.4
>      wiki.zbmc.eu is an alias for zbmc.eu.
>      wiki.zbmc.eu is an alias for zbmc.eu.
>      zbmc.eu mail is handled by 10 zbmc.eu.
>      chris$ host boat
>      boat.zbmc.eu has address 192.168.1.4
>      chris$ host info
>      info.zbmc.eu has address 192.168.1.4
>      chris$
>
> Can anyone explain why this might be and/or what I may have
> misconfigured? (By the way zbmc.eu is a 'real' domain and some services
> for it run on machine 'chris').
>

"is an alias for" if host-speak for CNAMES, and the CNAME seems to be 
coming from the global DNS:

srk at spike:~/dnsmasq-2.59$ dig wiki.zbmc.eu

; <<>> DiG 9.5.1-P3 <<>> wiki.zbmc.eu
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21679
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;wiki.zbmc.eu.			IN	A

;; ANSWER SECTION:
wiki.zbmc.eu.		10800	IN	CNAME	zbmc.eu.
zbmc.eu.		10800	IN	A	84.45.228.40

;; Query time: 43 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Dec  1 15:37:38 2011
;; MSG SIZE  rcvd: 60



Something like

local=/zbmc.eu/

should help insulate you internal view of the DNS from the external one.

What version of dnsmasq are you using?


Simon.