CPE on CPE ip's in a cablemodem network.

[Glenn Satchell]

Hi Espen

The first match statement can be written a little more efficiently, with 
no loss in readability, and similarly for the subclasses.

class "students" {
     match option agent.remote-id;
}
subclass "students" 0:26:24:8f:79:a9;
subclass "students" 0:1d:ce:f:46:c3;

In the original match statement there is only one value in the 
arguments, so pick-first-value() is not required. Secondly you can match 
the byte string directly, no need to convert to ascii first. If you 
leave the quotes off, you can represent a binary string as a series of 
hex digits (see dhcp-eval man page where this is covered).

regards,
-glenn

On 05/29/12 22:33, Espen Kristensen wrote:
> problem solved.
>
> If anyone wants to know how here is the config:
>
> class "students"{
> match pick-first-value( binary-to-ascii ( 16, 8, ":", option
> agent.remote-id) );
> }
> subclass "students" "0:26:24:8f:79:a9"; (CM MAC 1)
> subclass "students" "0:1d:ce:f:46:c3"; (CM MAC 2)
>
> subnet 158.x.x.0 netmask 255.255.255.0 {
> option subnet-mask 255.255.255.0;
> max-lease-time 86400;
> default-lease-time 86400;
> option routers 158.x.x.1;
> option domain-name-servers 77.x.x.5, 77.x.x.250;
> pool {
> range 158.x.x.2 158.x.x.254;
> allow members of "students";
> }
> }
>
> subnet 77.x.x.0 netmask 255.255.255.0 {
> option subnet-mask 255.255.255.0;
> max-lease-time 86400;
> default-lease-time 86400;
> option routers 77.x.x.1;
> option domain-name-servers 77.x.x.5, 77.x.x.250;
> pool {
> range 77.x.x.2 77.x.x.254;
> deny members of "students";
> allow unknown-clients;
> }
> }
>
> Kind regards,
> Espen Kristensen.
>
>
> -----Opprinnelig melding----- From: Espen Kristensen
> Sent: Tuesday, May 29, 2012 9:52 AM
> To: Users of ISC DHCP
> Subject: Re: CPE on CPE ip's in a cablemodem network.
>
> Hello,
>
> and thanks for your reply.
>
> We use BGP, and I typed wrong when I said business CM. It's not business
> but
> students. They have theire own internet transit and
> we only give them the last mile access. The cmts doesn't support vlans
> so we
> have to use policy routing.
>
> In the lease file for cpes I can see the cablemodem mac address:
>
> lease 77.x.x.72 {
> starts 1 2012/05/28 20:25:52;
> ends 2 2012/05/29 20:25:52;
> tstp 2 2012/05/29 20:25:52;
> cltt 1 2012/05/28 20:25:52;
> binding state active;
> next binding state free;
> billing subclass "ip_limit" 00:26:24:da:0a:28;
> hardware ethernet 00:18:e7:eb:60:b8;
> uid "\001\000\030\347\353`\270";
> option agent.circuit-id 20:0:0:2;
> option agent.remote-id 0:26:24:da:a:28; <-------------- Cable
> Mac
> client-hostname "DIR-635";
> }
>
> Is it possible to make a class for all the students CM and make an
> allow/deny rule in a cpe pool with the students default-gateway?
>
> Kind regards,
> Espen Kristensen.
>
>
> -----Opprinnelig melding----- From: Sebastien Cramatte
> Sent: Tuesday, May 29, 2012 8:31 AM
> To: Users of ISC DHCP
> Subject: Re: CPE on CPE ip's in a cablemodem network.
>
> Hello,
>
> BGP is a must have for an ISPŠ
>
> But In your case If you want to match business CM and home CM. This is not
> option 82 but the option 43 with class / subclass and
> pool allow / deny policies directly inside dhcpd.conf
>
>
>
> El 29/05/12 06:26, "Frank Bulk" <frnkblk at iname.com> escribió:
>
>> I would recommend getting PI space and doing BGP with those two transit
>> providers. That's the right answer.
>>
>> Frank
>>
>> -----Original Message-----
>> From: dhcp-users-bounces+frnkblk=iname.com at lists.isc.org
>> [mailto:dhcp-users-bounces+frnkblk=iname.com at lists.isc.org] On Behalf Of
>> maillist
>> Sent: Sunday, May 27, 2012 6:48 PM
>> To: dhcp-users at lists.isc.org
>> Subject: CPE on CPE ip's in a cablemodem network.
>>
>> Hi,
>>
>> we have 2 internett transit on a cablemodem network. One line is for
>> our private customers and the other is for our businesse customers.
>>
>> I wounder if I can get isc dhcpd to offer cpe adresses from subnets
>> based on which cablemodems they are behind? A guy told me I could use
>> option 82, but I'm not sure how. If I can make the dhcp server offer
>> addresses based on which cablemodems they belong to I can use policy
>> routing on the cmts to determine which default route they should use.
>>
>> Any help will be appreciated.
>>
>> Kind regard,
>> Espen Kristensen.
>>
>>