classless routes

[Glenn Satchell]

>Date: Wed, 21 Feb 2007 10:25:54 +0100
>From: "Enrique de Guindos Carretero" <eguindos at gmail.com>
>To: dhcp-users at isc.org

Does the dhcp-client configuration script know how to interpret option
121 and do the right thing? It may be that the client does not understand
what it has to do.

regards,
-glenn

>Hello Eric.
>Thanks for your quick answer.
>
>Unfortunately, my dhcp still does not work as I want with Linux clients.
>Now, my config file is the next:
>
>-------------------------------------------------------------------------------
----------------
>
>ddns-update-style none;
>authoritative;
>
>default-lease-time              3600;           # 1 hora
>max-lease-time                  14400;
>
>option ca-static-routes code 121  = array of unsigned integer 8;
>
><several options for domain, dns server, etc...>
>
>option  broadcast-address       192.168.0.255;
>option  routers                        192.168.0.1;
>option  subnet-mask               255.255.255.0;
>
>subnet  192.168.0.0  netmask 255.255.255.0
>{
>        pool
>        {
>                range   192.168.0.15    192.168.0.50;
>                option ca-static-routes 24, 192,168,0,0, 192,168,0,1;
>        }
>}
>...
>-------------------------------------------------------------------------------
--------------------
>
>But as soon as a Linux dhcp client boots, it has the normal route table,
>same as if I do not put the code 121 option:
>
>linux_client#> route
>
>Destination   Gateway      Genmask        Flags   Metric   Ref   Use   Iface
>192.168.0.0   *                 255.255.255.0 U         0          0
>0       eth0
>default          192.168.0.1  0.0.0.0           UG       0          0
>0       eth0
>
>And I think I should expect something like
>
>Destination   Gateway   ...
>192.168.0.0  192.168.0.1
>
>The above is what I observe on Windows Clients if I add an option for code
>249 instead (or together with) of code 121.
>
>Do you see anything wrong on my configuration?
>
>Just to let you know, I'm using OpenSuSE 10.2
>
>Thanks a lot in advance,
>
>Enrique
>
>2007/2/20, Eric Helm <helmwork at ruraltel.net>:
>>
>>
>> Enrique de Guindos Carretero wrote:
>> > Hello.
>> > I'm new to dhcp and I'm having a problem.
>> >
>> > I have read RFC 3442 concerning classless routes sent to the dhcp
>> clients.
>> >
>> > As I saw, Windows clients are using code 249 while the standard one is
>> 121.
>> > On Windows clients I have no problems. But I have troubles on Linux
>> ones.
>> >
>> > On my dhcpd.conf I have:
>> >
>> > option  ca-static-routes code 121 = string;
>> > option  ca-static-routes 18:C0:A8:00:C0:A8:00:01;
>> >
>> > In order of having  192.168.0.0/24 routed through 192.168.0.1 router.
>> > Changing the code with 249 works for windows clients. But with code 121,
>> my
>> > Linux clients are receiving nothing and they have not the static route
>> > configured.
>> >
>> > Is it there any solution?
>> >
>>
>> For my linux hosts, this config works to supply option 121:
>> option classless-routes code 121 = array of unsigned integer 8;
>>
>> subnet 192.168.0.0 netmask 255.255.255.0
>> {
>>        pool
>>        {
>>                range 192.168.0.2 192.168.0.254
>>                option classless-routes 24, 192,168,0,0,  192,168,0,1;
>>        }
>> }
>>
>> /Eric
>>
>>
>
>
>