Re: Matching option agent.remote-id

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After some trial and error I just fixed this. For those interested, the
correct syntax is:

if binary-to-ascii(16, 8, ":", substring (option agent.remote-id,4,5)) =
"aa:b1:cc:26:30" {
        option routers xxx.xxx.188.1;
} else {
        option routers xxx.xxx.191.1;
}

Cheers,

Nicolai van der Smagt

On Wed, 2003-01-29 at 14:50, Nicolai van der Smagt wrote:
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> 
> Hello,
> 
> We have been running a config for Cisco DSL NAS (NRP), with this bit in
> it (Redhat 7.3, dhcp-3.0pl2):
> 
> class "default-economy" {
>         spawn with option agent.remote-id;
>         lease limit 1;
> }
> 
> This works fine, each DSL line get's no more than 1 lease.
> We are now adding more NAS'es, and like customers from all NAS'es to
> receive a single IP address from the pool, but we like to decide what
> 'option routers' to hand out based on the NAS IP address.
> 
> Our option 82 looks like this:
> 
> 1:1:0:0:aa:b1:cc:26:30:4:0:2b;
> 
> where bytes 5-9 (aa:b1:cc:26:30) are unique for each NAS. We have tried
> many different ways to match this, and base 'option routers' on it
> (using different classes, subclasses, 'if substring' statements). This
> is the last thing we tried:
> 
>         subnet xxx.xxx.128.0 netmask 255.255.128.0 {
>         if ( substring (option agent.remote-id,4,5) = "aa:b1:cc:26:30" )
> {
>                 option routers xxx.xxx.188.1;
>         } else {
>                 option routers xxx.xxx.191.1;
>         }
>                 authoritive;
>                 option subnet-mask 255.255.128.0;
>                 option domain-name "x.nl";
>                 option domain-name-servers ns1.x.nl, ns2.x.nl;
>                 pool {
>                         allow members of "default-economy";
>                         range xxx.xxx.188.10 xxx.xxx.188.254;
>                         range xxx.xxx.189.10 xxx.xxx.189.254;
>                         range xxx.xxx.190.10 xxx.xxx.190.254;
>                         range xxx.xxx.191.10 xxx.xxx.191.254;
>                 }
>         }
> 
> (Yes the subnet is a /17, we use proxyarp on the NAS'es)
> 
> Somehow the matching never works, and the routers option in the lease is
> always xxx.xxx.191.1. It's not the syntax of the 'if substring'
> statement I think, as we tried this with classes as well, something like
> this:
> 
> class "test1" {
>       match if (same expr as above)
>       match option agent.remote-id
>       option routers xxx.xxx.188.1
>       lease limit 1
> }
> 
> class "test2" {
>       match if (different expression)
>       match option agent.remote-id
>       option routers xxx.xxx.191.1
>       lease limit 1
> }
> 
> subnet {
>       allow members of test1
>       allow members of test2
> }
> 
> In this case we got a 'no free leases' in the logfile, I think meaning
> that the option agent.remote-id hadn't matched either of the classes.
> 
> Can anyone advice what we might be doing wrong?
> 


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