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<pre><strong>Simon Hobson</strong> WROTE<br><br>test24 <<a href="https://lists.isc.org/mailman/listinfo/dhcp-users" data-mce-href="https://lists.isc.org/mailman/listinfo/dhcp-users" target="_blank">test24 at mail.ru</a>> wrote:
><em> man dhcp relay says:
</em>>><em> -p PORT
</em>><em> Listen and transmit on port PORT. This is mostly useful for
</em>><em> debugging purposes. Default is port 67 for DHCPv4/BOOTP
</em>
That changes the port the relay agent uses - but **NOT** the port it assumes the server is using. Checking the man page I see nothing to suggest it can talk to a server via a non-standard port - you could try "nnn.nnn.nnn.nnn:77" for server IP, but I suspect that's not implemented.
If not, I imagine it might be "relatively" simple to edit the code and hard code a different server port to use.<br><br><br>For dhcp relay next server is written in rc.conf as the<br><br>dhcrelay_servers="10.10.10.1" # v4 dhcrelay server(s)<br><br>and option -P says ONLY ! one port - for clients and for next server<br><br>This port is the same for clients and for next server<br><br><br>In my case dhcp relay MUST listen one port (standart 67/68 for clients side) and send requests to NEXT server on OTHER port.<br>It is one the SAME machine, than I can not say ! dhcpD ! listen 67 port too. And as a result - dhcpd server not see requests on 77 port because dhcp relay uses only ONE port<br>for clients side and for servers side.<br><br>It is generally unneded if the relay and server placed on different machines, but if machine is same - it is actual needed feature... because i want to add option 82 packets <br>by relay and send replies on this requests by dhcpd server without using second machine.<br><br>Second reason - my machine acts as router and vlans back end. Than option 82 must be added on this machine ().<br>And on this machine dhcpd must say replies for unknown client MACs but known client vlans<br><br><br><br><br><br></pre>
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