[Dnsmasq-discuss] how to configure lot of static routes

[Michał Lipka]

2015-06-30 12:10 GMT+02:00 Maciej Soltysiak <maciej at soltysiak.com>:

> On Tue, Jun 30, 2015 at 4:03 AM, wkitty42 at gmail.com <wkitty42 at gmail.com>
> wrote:
>
>>
>> On 06/29/2015 04:01 PM, Michał Lipka wrote:
>>
>>>
>>> 2015-06-25 16:02 GMT+02:00 wkitty42 at gmail.com
>>>     does breaking the line work?
>>>
>>>     eg:
>>>     dhcp-option=249,10.0.0.1/32,1.2.3.4,192.168.13.15/32,1.2.3.4
>>>     <http://10.0.0.1/32,1.2.3.4,192.168.13.15/32,1.2.3.4>, \
>>>     192.168.13.16/32,1.2.3.4,192.168.13.17/32,1.2.3.4
>>>     <http://192.168.13.16/32,1.2.3.4,192.168.13.17/32,1.2.3.4>, \
>>>     192.168.13.18/32,1.2.3.4,192.168.13.19/32,1.2.3.4
>>>     <http://192.168.13.18/32,1.2.3.4,192.168.13.19/32,1.2.3.4>, \
>>>     192.168.13.20/32,1.2.3.4 <http://192.168.13.20/32,1.2.3.4>
>>>
>>>
>>> Thank you for this idea. Unfortunately it does not work. dnsmasq fails
>>> at first
>>> line which has no option:
>>>
>>
>> sounds like an option that should maybe be implemented... especially
>> since it is an apparent standard that so many tools do follow ;)
>>
> I think dnsmasq has a 1024 characters for config lines. I browsed the
> source briefly last night but couldn't find it.
>

I checked it more precisely and it turned out that is not line length that
bothers dnsmasq. It's routes count.
I can set up to 28 routes in single dhcp-option line. It doesn't matter if
it will take 600 or 800 characters. If I set 29th route dnsmasq complains
about option too long:

dnsmasq: dhcp-option too long at line 320 of /etc/dnsmasq.conf
Can you check the code once again and try to find this limit (28) ? Why it
is like that?


> Anyway, I too hit this when I configure dummy zones to return NXDOMAIN.
> What I do to get around this is to use mutliple directives, e.g.:
> server=/doubleclick.net/...bla bla bla bla bla /
> server=/nextline.goes.here/more.domains.to.return.nxdomain.for/
>
> Would it work if you did something similar:
> dhcp-option=249,routes go here,routes go here,
> dhcp-option=249,more routes go here,...
> dhcp-option=249,even more routes go here,...
>
> So that each line is less than 1024 characters?
>

As I wrote above it's not about characters. Besides of that if multiple
options are specified only last one is applied (please check first email of
this thread for an example).

-- 
Michal
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