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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