OpenWrt dnsmasq cname doesn't resolving ip of domain after a while

Installing and Using OpenWrt Network and Wireless Configuration
1

I have a simple cname "cname=xxx.com,yyy.com" entry in dnsmasc.conf where "yyy.com" - existing domain. Everything works fine, but after some time the router stops giving the IP address.

Server:		127.0.0.1
Address:	127.0.0.1#53

Name:      xxx.com
xxx.com	canonical name = yyy.com
Name:      yyy.com
xxx.com	canonical name = yyy.com

But if I execute the nslookup command to yyy.com from the router or even from PC, then the router immediately starts giving out the address. What could be the problem? Thanks.
dnsmasq.conf:

config dnsmasq
	option domainneeded '1'
	option localise_queries '1'
	option rebind_protection '1'
	option rebind_localhost '1'
	option local '/lan/'
	option domain 'lan'
	option expandhosts '1'
	option authoritative '1'
	option readethers '1'
	option leasefile '/tmp/dhcp.leases'
	option localservice '1'
2

How do you know it fails sometime in the past, and now, when you do the the nslookup?

3

Because I can't open any link in xxx.com domain and nslookup to xxx.com not giving address. Only nslookup yyy.com help router to "recall" it. I think dns record wipe or expire somehow and dnsmasq does not request entry for cname alias.

4
5

Tried with dhcp config too. Same result.
Here is video.

6

It is mentioned in the wiki that you need the hostname to be created for the cname to work. Have you done that?

7

Do you mean assign domain xxx.com ip address of domain yyy.com through hostname? I can't do that, because ip of yyy.com is dynamic. That's why i'm trying to use cname. Thanks.

8

Your dnsmasq is not authoritative for the domain you are trying to resolve via cname. The resolving works until the TTL expires. A workaround would be to periodically query the rutracker dot net so that the answer is cached.

1 Like
9

Ok, seems it's time for cronjob. Thanks for reply!

10

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