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Have you read the man page with dhcrelay?<br />
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You also need to tell it to listen on ether2 &nbsp; (add -i ether2) to allow a request coming from that direction.
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Ok, I got it like this<br />
client .. -&gt; no-ip ethernet device ( pppoe server ) ether 1 -&gt; &nbsp;ether2 ( 10.233.0.3 ) link to dhcp server -&gt; eth0 &nbsp;(10.233.0.2 ) ... <br />
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I do dhcrelay -i eth0 10.233.0.2 -d ( to see what it does ) ..<br />
- it shows that it's forwarding the request to the right place ..<br />
- the main dhcp server shows it trying to discover ( via eth0 ) <br />
&nbsp; - the dhcp server offers ip ( via eth0 ) to mac .. not good because I need it to reply via ip ! ( the mac address doesn't exist directly to eth0 ) .. <br />
<br />
what's wrong and what do I have to do ?
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Ok, I got it like this
client .. -> no-ip ethernet device ( pppoe server ) ether 1 ->  ether2 ( 10.233.0.3 ) link to dhcp server -> eth0  (10.233.0.2 ) ... 

I do dhcrelay -i eth0 10.233.0.2 -d ( to see what it does ) ..
- it shows that it's forwarding the request to the right place ..
- the main dhcp server shows it trying to discover ( via eth0 ) 
  - the dhcp server offers ip ( via eth0 ) to mac .. not good because I need it to reply via ip ! ( the mac address doesn't exist directly to eth0 ) .. 

what's wrong and what do I have to do ?

Relaying dhcp requests .. how ?

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator. The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s).

DHCP

The variety of Linux distributions creates myriad issues relating to configuration and operations when computers are networked, not the least of which is the use of various network management applications, some of which are included with specific distributions, while others are standalone applications.