[Dnsmasq-discuss] cache confusion

[Simon Kelley]

Carla Schroder wrote:
> On Wednesday 24 January 2007 14:35, Simon Kelley wrote:
> 
>>Carla Schroder wrote:
>>
>>>I'm confused about dnsmasq's DNS cache. I know that it works, and works
>>>well. Is there a way to see the contents of the cache?
>>
>>Yes, it's easiest to start dnsmasq in debug mode (-d) which keeps it in
>>the foreground. Then when you want to see the current cache contents,
>>send dnsmasq SIGUSR1 like this:
>>
>>killall -USR1 dnsmasq
>>
>>and a dump will be printed to the terminal.
> 
> 
> One more question, and I did try to find an answer on my own- what do the 
> cache flags mean?  (Expires column snipped)
> 
> dnsmasq: Host                Address                                Flags     
> dnsmasq: stinkpad.alrac.net     192.168.1.102                  4FRI   H
> dnsmasq: localhost                   127.0.0.1                        4F I   H
> dnsmasq: i.cnn.net                   64.236.16.137                  4F     
> dnsmasq: m1.2mdn.net.edgesuite.net    a509.cd.akamai.net             CF 
> 
> thanks!
> 

Good point. The complete list is

4 - IPv4 address
6 - IPv6 address
C - CNAME
F - forward (name->address) mapping
R - reverse (address->name) mapping
I - immortal (no expiry time)
D - originates from DHCP
N - negative (name known not to have address)
X - no such domain (name known not to exist)
H - originates from /etc/hosts.

Note that both F and R may be set for names from DHCP or /etc/hosts.

Cheers

Simon.