[Dnsmasq-discuss] 2 routes

[Geert Stappers]

On Sun, Nov 28, 2021 at 11:55:59PM -0800, Carl Karsten wrote:
> On Sun, Nov 28, 2021 at 11:20 PM Geert Stappers wrote:
> > On Sun, Nov 28, 2021 at 03:44:38PM -0800, Carl Karsten wrote:
> > > I don't think DHCP supports this, but I'm not sure.
> > >
> > > Can the server send 2 (or more) pairs of netmask/gateway ?
> >
> > Yes, DHCP option 121,  classless static routing
> >
> > Described in https://datatracker.ietf.org/doc/html/rfc3442
> >
> > Check dnsmasq man page for dhcp-option and dhcp-option-force
> >
> 
> Thank you.
> 
> > > Otherwise I suspect this can be done if client has 2 virtual
> > > interfaces, do DHCP request with different client ids.
> > >
> > > Trying to keep all the networking config settings on the server, not
> > > have anything baked into client machines.
> >
> > Carl, original poster, will learn what the DHCP clients do
> > with what the DHCP server provides. I mean that having the
> > best server is meaningless when the clients don't understand it.
> >
> 
> Good tip, I won't assue anything just works.  does anything ever just work? ;)

Yes, very often.  The trick is getting both ends to understand each other.


> this is encouraging:
> 
> /etc/dhcp/dhclient.conf
> option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
> send host-name = gethostname();
> request subnet-mask, broadcast-address, time-offset, routers,
>     domain-name, domain-name-servers, domain-search, host-name,
>     dhcp6.name-servers, dhcp6.domain-search, dhcp6.fqdn, dhcp6.sntp-servers,
>     netbios-name-servers, netbios-scope, interface-mtu,
>     rfc3442-classless-static-routes, ntp-servers;
> 

Yeah, lets assume that is good and please tell
if https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=blob;f=dnsmasq.conf.example;hb=HEAD#l415
needs to get updated.


Groeten
Geert Stappers
-- 
Every time you assume, you make an ass of you and me.