bind-9.7.2 not forward CNAMEDed domain names

[Florian Weimer]

* Drunkard Zhang:

> My capture command: tcpdump -s 0 -nnnvvv -w 360.cn-`date +%Y%m%d`.pcap
> udp port 53
>
> 17:59:36 ~ $ dig +nocmd speedtest.360.cn @211.161.192.1 +multiline
> +noall +answer
> speedtest.360.cn.	215 IN CNAME speedtest.360.cn.cloudcdn.net.
> speedtest.360.cn.cloudcdn.net. 325 IN CNAME cloud010005.cachecn.com.
> cloud010005.cachecn.com. 368 IN	A 61.155.141.28
>
> but bind just resolved cloud010005.cachecn.com again.

With a cold cache, I see this:

[1au] A? speedtest.360.cn. ar: . OPT UDPsize=4096 OK (45)
[1au] A? speedtest.360.cn.cloudcdn.net. ar: . OPT UDPsize=4096 OK (58)
[1au] A? cloud010005.cachecn.com. ar: . OPT UDPsize=4096 OK (52)

I suspect that the middle CNAME is still in cache in your case.

-- 
Florian Weimer                <fweimer at bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99