I am trying to set option routers to a domain name but it does not show up in the client leases file

[Glenn Satchell]

You still need to obey basic networking rules, whether you use an ip or
hostname.

'option routers' sets the default gateway for the client, this needs to be
the address on the local subnet for the gateway. Perhaps the client is
smart enough to reject an invalid address?

Have you tried snooping the network traffic to see what is being sent from
the server?

As others have said 3.0 is really old, full of bugs (no disrespect
intended to the authors), so maybe it cannot cope with a hostname that
resolves to >1 ip address?

My dhcpd.conf contains a line similar to:

  option routers gw.example.com.au;

and that has worked fine for many years.

regards,
-glenn

On Thu, August 23, 2012 6:18 am, Zentner, Jeff wrote:
> I am trying to set option routers to a domain name but it does not show up
> in the client leases file
>
> I am running dhcpd version "Internet Software Consortium DHCP Server
> V3.0pl2_DHCP4"
>
> From dhcp-options.5
> ...
> ip-address
> data type can be entered either as an explicit IP
> address (e.g., 239.254.197.10) or as a domain name (e.g.,
> haagen.isc.org).  When entering a domain name, be sure that that
> domain name resolves to a single IP address.
> ...
>
> If I configure option routers as an IP Address like below it is in the
> client leases file like below
>
> From Server
> cat /var/tmp/shells/dhcpd.conf
> authoritative;
> ddns-update-style none;
> subnet 172.17.10.0 netmask 255.255.255.0 {
>   range 172.17.10.50 172.17.10.60;
>   option subnet-mask 255.255.255.0;
>   option root-path "test";
>  option routers 1.1.1.1;
>   option dhcp-parameter-request-list 3;
>   default-lease-time 600;
>   max-lease-time 7200;
>   min-lease-time 60;
>   option domain-name "my.domain";
> }
>
> From Client
> lease {
>   interface "ethernet1";
>   fixed-address 172.17.10.60;
>   option routers 1.1.1.1;
>   option dhcp-lease-time 600;
>   option dhcp-message-type 5;
>   option dhcp-server-identifier 172.17.10.21;
>   renew 2 2012/8/21 19:18:35;
>   rebind 2 2012/8/21 19:22:30;
>   expire 2 2012/8/21 19:23:45;
> }
>
> If I configure option routers as a domain name like below it is not in the
> client leases file like below
>
> From Server
> cat /var/tmp/shells/dhcpd.conf
> authoritative;
> ddns-update-style none;
> subnet 172.17.10.0 netmask 255.255.255.0 {
>   range 172.17.10.50 172.17.10.60;
>   option subnet-mask 255.255.255.0;
>   option root-path "test";
>   option dhcp-parameter-request-list 3;
>   option routers yahoo.com;
>   default-lease-time 600;
>   max-lease-time 7200;
>   min-lease-time 60;
>   option domain-name "my.domain";
> }
>
> From Client
> lease {
>   interface "ethernet1";
>   fixed-address 172.17.10.60;
>   option dhcp-lease-time 600;
>   option dhcp-message-type 5;
>   option dhcp-server-identifier 172.17.10.21;
>   renew 2 2012/8/21 19:21:48;
>   rebind 2 2012/8/21 19:25:58;
>   expire 2 2012/8/21 19:27:13;
> }
>
> What am I doing wrong?
>
> Jeff Zentner
> Hewlett-Packard Co.
>
>
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