Change dhcp-client-identifier

[Thomas Zenz]

Dear all,

We are running isc dhcp for years now.
In the last weeks the count of vpn clients is growing. We only planned a
/24 network. That would be ok if there wasn't the cisco logic of
creating the dhcp-client-identifier.  Cisco takes his own Mac-address,
adds the PCName and here comes the problem, a random number...
So my Client uses 17 Leases!
I reduced the lease-time to 1h but still, if a usere reconnects 3 times
in one hour, it uses 3 addreses.

  uid "\000cisco-881d.fc6f.affe-NB326973851-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973852-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973857-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973858-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973861-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973863-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973848-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973850-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973853-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973854-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973873-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973859-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973865-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973866-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973868-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973869-inside\000";
  uid "\000cisco-881d.fc6f.affe-NB326973870-inside\000";

I tried to change the uid like this:
on commit {
   set myClientID = pick (option dhcp-client-identifier,0);
   log (info, concat ("ClientID: ",myClientID));
but it looks like the option is no string... 
(from the log)
dhcpd: ClientID: HPs2,
dhcpd: ClientID: HPs2,
dhcpd: ClientID: fÚAi
dhcpd: ClientID: HPsY
dhcpd: ClientID: HPsW¬
dhcpd: ClientID: lbmw&
dhcpd: ClientID: lbmw&
dhcpd: ClientID: HPsY
dhcpd: ClientID: HPsY
dhcpd: ClientID: HPsY
dhcpd: ClientID: HPsY
dhcpd: ClientID: HPs3T
dhcpd: ClientID: HPsW¬
dhcpd: ClientID: HPsW¬
dhcpd: ClientID: HPs\
dhcpd: ClientID: HPs\

I tried to do it like this:
        if (binary-to-ascii(10,8,".",packet(24,3)) = "192.168.1" ) {
             set vpnClientID = concat(substring(myClientID,26,6),"-inside");
             set dhcp-client-identifier = vpnClientID;
             log (info, concat ("vpnClientID: ",vpnClientID));
        }
This is also not working. I use a similar option to choose the PXE Bootfile.

Please help
Kind Regards
Thomas