Trying to configure ipv4 and ipv6 addresses on hosts using one dhcp server fails.

Eddie Lania eddie at
Tue Aug 24 18:39:13 UTC 2010

I am running both separate instances for dhcpv4 and v6:

chkconfig --list |grep dhcp
dhcpd          	0:off	1:off	2:on	3:on	4:on	5:on	6:off
dhcpd6         	0:off	1:off	2:on	3:on	4:on	5:on	6:off

On Tue, 2010-08-24 at 20:34 +0200, sthaug at wrote:
> > Now, when running dhcp for both dhcpv4 and v6 clients on the same
> > server, dhcp service does not allow for an exsisting v4 record to be
> > updated with v6:
> As far as I know, ISC DHCP cannot handle both IPv4 and IPv6 using the
> same dhcpd process. You need two instances of the process. See this
> section from the dhcpd man page:
>  The server either operates as a DHCPv6 server or a DHCP server, but not
>  both  at  the same time. To run as a DHCPv6 server, use the -6 flag. To
>  run as a DHCP server, use the -4 flag. If neither is used, the  default
>  is to run as a DHCPv6 server.
> Steinar Haug, Nethelp consulting, sthaug at

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