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

[Albert ARIBAUD]

Bonjour Michał,

Le Tue, 30 Jun 2015 13:54:11 +0200, Michał Lipka <michal at lipka.email> a
écrit :

> 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?

Could it be that the total DHCP packet size goes over the maximum
allowed size for an UDP frame?

Amicalement,
-- 
Albert.