[DHCPDISCOVER]unknown network segment.

[Simon Hobson]

Eugène Ngontang <sympavali at gmail.com> wrote:

> In fact I have in dhcpd conf file a block defining a subnet like this : 
> 
> subnet X.X.X160 netmask 255.255.255.224 {
>         option routers                  X.X.X.161;
>         option subnet-mask              255.255.255.224;
>         option nis-domain               "mynisdomain.com";
>         option domain-name              "mydomain.org";
>         option domain-name-servers      Y.Y.Y.3, Y.Y.Y.3;
>         range                           X.X.X.162 X.X.X.190;
>         default-lease-time 21600;
>         max-lease-time 43200;
> 
> }
> 
> Howerver my client is not getting any ip address, and from my dhcp server I see this error in the logs :
> 
> Oct 12 04:02:27 SERVERHOSTNAME dhcpd: DHCPDISCOVER from 00:aa:aa:aa:aa:aa via X.X.X.163: unknown network segment
> Oct 12 04:02:27 SERVERHOSTNAME dhcpd: DHCPDISCOVER from 00:aa:aa:aa:aa:aa  via X.X.X.162: unknown network segment

Well the fact that you get packets via X.X.X.162 and X.X.X.163 suggest that there are device(s) with those addresses - the addresses should therefore **NOT** be in a dynamic pool as you have here.

But the main problem is that because you've changed things, we can't (for example) look for obvious typos. First thing to *really* check is that X.X.X is the same set of numbers in all cases - it's not hard to make a typo, and usually very hard to spot them. As an example, do you realise that you've missed a "." at the start of the subnet declaration ?