Re[2]: How to - DHCP Relay and Server on same machine (FreeBSD)

[test24]

Среда, 17 июня 2015, 16:26 +02:00 от Roberto Innocente <inno at sissa.it>:
>
>client
>listen on 68 sends to port 67 --->
>                       relay listen on 67 forwards on 67
>                                     --> server listen on 67 replies to 
>68 or 67 (if its a relay)
>
>cant work unless you change ports used
>
man dhcpd says:

       -p port
              The  udp  port number on which dhcpd should listen.  If unspeci-
              fied dhcpd uses the default port of 67.  This is  mostly  useful
              for debugging purposes.

       -s address
              Specify  an  address  or  host  name  to which dhcpd should send
              replies rather than  the  broadcast  address  (255.255.255.255).
              This option is only supported in IPv4.


than dhcpd  listen 10.10.10.1:77 

man dhcp relay says:

-p PORT
              Listen  and  transmit  on  port PORT.  This is mostly useful for
              debugging purposes.  Default is port  67  for  DHCPv4/BOOTP


dhcpd and relay cannot work on same socket on same machine, than i need to
say dhcpd to listen another port such as 77. and dchp relay forward all requests from 67 port to 77 port dhcpd


and shema is next:

clients ip*:67/68 port <-> all ifaces *:68/68 dhcp relay send/receive 77port <-> 10.10.10.1:77 port dhcpd

But this shema do not work on relay <-> dhcpd side - no any info in logs and any packets by dumping 10.10.10.1:77





>
>
>
>On 2015-06-17 14:24, test24 wrote:
>> Hello!
>> 
>> I need to use DHCP Relay and DHCP Server on same machine, but while
>> compile and try to use with lot of options - no positive result.
>> 
>> But how to compile with right options
>> 
>> Setup:
>> Freebsd 9.x
>> CLIENTS <---> [ Multi igb0,1,2,3,4, em0,1, multiple vlans] (relay
>> agent) <---> DHCP Server ]
>> 
>>  The relay agent *runs on ALL interfaces that faces the client and
>> DHCP server runs and listen other port such as 77 and
>> 
>> rc.conf
>> 
>> dhcpd_enable="YES"
>> dhcpd_flags="-p 77"
>> dhcpd_ifaces="igb1"
>> 
>> dhcrelay_enable="YES"
>> dhcrelay_flags="-a -d -D"
>> dhcrelay_servers="10.10.10.1" # DHCPD IP on igb1 iface
>> dhcrelay_ifaces=""
>> 
>> dhcpd.conf
>> 
>> local-address 10.10.10.1;
>> 
>> stash-agent-options true;
>> # for debug
>> allow unknown-clients;
>> 
>> if exists agent.circuit-id
>> 
>> {
>> log (
>> info, concat( " Lease for ", binary-to-ascii (10, 8, ".",
>> leased-address),
>>  " Swith port: ", binary-to-ascii (10, 8, ".", option
>> agent.circuit-id),
>>  " Switch MAC: ", binary-to-ascii (16, 8, ":", suffix ( option
>> agent.remote-id, 6)),
>>  " Switch IP: ", binary-to-ascii(10, 8, ".", packet(24, 4)),
>>  " VLAN: ", binary-to-ascii (10, 16, "", substring( option
>> agent.circuit-id, 2, 2)),
>>  " MAC on the port: ", binary-to-ascii (16, 8, ":",
>> substring(hardware, 1, 6))
>> )
>> );
>> 
>> With classic dhcp server ONLY - all work ok
>> 
>> When dhcp relay and server starts both on same machine - no errors due
>> to misconfiguration or
>> already socket listen - at that point all ok
>> 
>> I see incoming packets from clients on dhcp relay side but not see
>> packets on dhcp server side
>> Where is mistake and how to ./configure and make dhcp relay and server
>> with right options ?
>> 
>> Thanks
>> 
>> _______________________________________________
>> dhcp-users mailing list
>>  dhcp-users at lists.isc.org
>>  https://lists.isc.org/mailman/listinfo/dhcp-users
>
>-- 
>Roberto Innocente - SISSA
>inno at sissa.it - +39 40 3787541

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