DHCP / Cisco IPhelper - Problem to get valid IP-Adresses

Christian Binder binder.christian at gmx.de
Thu Jul 31 14:15:32 UTC 2008


Thanks for your quick reply and sorry for my mistake. Here are my subnet-declaration parts:
The Hosts are actually insdide the subnet declaration. If we move a client, we move his entry in the new one. 

# Department001_192.168.3.0/24
subnet 192.168.3.0 netmask 255.255.255.0 {
        server-name "depot.company.de";
        option subnet-mask 255.255.255.0;
        option domain-name "company.de";
        option domain-name-servers 192.168.1.64 , 192.168.1.4, 192.168.1.5;
        option routers 192.168.3.1;
        option broadcast-address 192.168.3.255;
        option ntp-servers ntp01.company.de;
        pool {
                failover peer "dhcp-failover";
                max-lease-time 1800;
                range 192.168.3.10 192.168.3.15;
                deny dynamic bootp clients;
                }
        # 
        host marpa352MF
        ...
        }
        
# Department002_101
subnet 192.168.4.0 netmask 255.255.255.0 {
        server-name "depot.company.de;
        option subnet-mask 255.255.255.0;
        option domain-name "company.de";
        option domain-name-servers 192.168.1.64 , 192.168.1.4, 192.168.1.5;
        option routers 192.168.4.1;
        option broadcast-address 192.168.4.255;
        option ntp-servers ntp01.company.de;
         pool {
                failover peer "dhcp-failover";
                max-lease-time 1800;
                range 192.168.4.10 192.168.4.15;
                deny dynamic bootp clients;
                }

				#
				host  
				...
				}

Thank you for support.




-------- Original-Nachricht --------
> Datum: Thu, 31 Jul 2008 08:20:42 -0500
> Von: Tim Peiffer <peiffer at umn.edu>
> An: dhcp-users at isc.org
> Betreff: Re: DHCP / Cisco IPhelper - Problem to get valid IP-Adresses

> You are missing a critical element.. what is the configuration of the 
> subnet..  do you multinet (aka secondary)?
> The 'ip helper-address' in the cisco's only cause the router to edit the 
> giaddr field of the DHCP packet, tear off the IP broadcast headers and 
> then resend them as unicast to the 'helper-address' as a destination.
> 
> Regards,
> Tim Peiffer
> 
> > The 192.168.4.2 is the address of the iphelper.
> > Are we doing something wrong on the dhcp-Severs (misconfiguration) or is
> this a 
> > indicate of a IP-Helper / Cisco misconfiguration ? 
> > What configuration infos about the Ciscos are further required, to
> adress the problem ? 
> > I will try to get these, please let me know.... 
> >
> > Thank you,
> >
> > Christian
> >   
> 
> 
> -- 
> Tim Peiffer
> Network Support Engineer
> Office of Information Technology
> University of Minnesota/NorthernLights GigaPOP
> 

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