[Dnsmasq-discuss] Announce: dnsmasq-2.53 release candidate 1

[Simon Kelley]

clemens fischer wrote:
> Simon Kelley wrote:
> 
>> clemens fischer wrote:
>>
>>> I have this line in the config:
>>>
>>>   dhcp-generate-names=tag:wlan
>>>
>>> dnsmasq-2.53rc1 complains:
>>>
>>>   dnsmasq: extraneous parameter at line 720 of /etc/dnsmasq.conf
>> Thanks for that: a one-line fix needed. I'll push out 2.53rc2 later today.
> 
> While you're at it:
> 
> I have this:
> 
>     # -ino: 100524-2051 XXX doesn't work! use static host alloc!
>     # option 12: hostname
>     #dhcp-option = tag:XXX,12,xxx
>     #dhcp-option = tag:wlan,51,30m
> 
> I wanted to send some hostname and set the lease time depending on that
> fabulous tag system, but both are obviously ignored.  I could not
> discern is the original
> 
>     dhcp-host=tag:XXX,xxx,192.168.3.5,30m
> 
> did its thing, though.  The log doesn't mention sending that "xxx"
> hostname.  Then again:  the host didn't request one and the manual
> doesn't say I can use tags like this.

The hostname and lease time are both data that dnsmasq uses locally,
they are not just opaque data that's passed through to the client. I
think there's code which explicitly blocks setting those options. It
would be bad if you sent an option 51 that told the client that it had a
lease for a day, but dnsmasq expired the lease after an hour and the
host disappeared from the DNS.


> 
> BTW:  this is confusing (re. "--dhcp-host" option):
> 
>     Addresses allocated like this are not constrained to be in the range
>     given by the --dhcp-range option, but they must be in the same
>     subnet as some valid dhcp-range.  For subnets which don't need a
>     pool of dynamically allocated addresses, use the "static" keyword in
>     the dhcp-range declaration.
> 
> Does this mean I don't have to put some host into the range it was
> allocated from, but into any other range specified?  I just don't get
> it.


An example helps: if you have an network which is 192.168.1.0/24 and you
specify

dhcp-range=192.168.1.100,192.168.1.200

then clients will get addresses in the range specified. Unless
you have

dhcp-host=00:11:22:33:44:55,192.168.1.20

which is valid because 192.168.1.20 is within the 192.168.1.0/24 subnet,
so a client with that mac-address will get 192.168.1.20.

On the other hand

dhcp-host=00:11:22:33:44:55,192.168.2.20

would be ignored because the IP address is not within the subnet.

HTH

Simon.



> 
> 
> clemens
> 
> 
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