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Thread: Using a DHCP server for two subnets
Using a DHCP server for two subnets
user name
 2006-06-20 16:56:38 

  


  

    

dhcp doesn't cross subnets by default (it's broadcast). You 
can set up your vlans with a


helper address pointing to your dhcp server, ir you might 
try setting up a dhcp proxy. I


have never set up a dhcp proxy, but I use helper addresses 
all the time. Seems to work


ok.


 


 


Corey






From: kickstart-list-bouncesredhat.com 
[mailto:kickstart-list-bouncesredhat.com] On Behalf Of 
Elizabeth.Broschthomson.com
Sent: Tuesday, June 20, 2006 10:35 
AM
To: kickstart-listredhat.com
Subject: Using a DHCP 
server for two subnets







Has anyone successfully used one 
DHCP to serve hosts on two subnets?


 


If anyone can share their dhcpd.conf 
syntax, I would appreciate.  I think I have it correct because the DHCP 
server will issue:


 


dhcpd: 
DHCPDISCOVER……̷0;………;…230;……R30;…..


dhcpd: 
DHCPOFFER…R30;……̷0;………;…230;……R30;…


dhcpd: 
DHCPREQUEST………;…230;……R30;……̷0;…..
dhcpd: 
DHCPACK……;…230;……R30;……̷0;………;…230;..


 


But then I immediately 
receive:


 


in.tftpd[4254]: RRQ from 
10.225.248.1 filename pxelinux.0


in.tftpd[4254]: tftpd: read: 
Connection refused


 


I am not sure if it is a dhcpd.conf 
configuration problem or not.  My switch has “port fast”; enabled.  I 
can Kickstart servers with no problem but when I introduce a second subnet into 
my dhcpd, tftp fails.


 


How anyone ever seen 
this?


 


I had tried this a few months ago 
but was never able to get around it but I have a need to revisit this now and 
get it working.


 


Thanks.


 


Liz 
Brosch


TSH System 
Services


Philadelphia, PA  19104


office:  (215) 
823-6144


cell: ;    (267) 
784-9166


 

  

  
  
   
     
    

  

    Using a DHCP server for two subnets
  


  

     user name

     2006-06-20 19:45:34
  


  

    

  


  

    
El mar, 20-06-2006 a las 12:56 -0400, Kovacs, Corey J. escribi43;:

thats right you need configure vlan with sub-interfaces for each subnet


    dhcp doesn't cross subnets by default (it's broadcast). You can set up your vlans with a




    helper address pointing to your dhcp server, ir you might try setting up a dhcp proxy. I




    have never set up a dhcp proxy, but I use helper addresses all the time. Seems to work




    ok.




     




     




    Corey




    





    




    From: kickstart-list-bouncesredhat.com [mailto:kickstart-list-bouncesredhat.com] On Behalf Of Elizabeth.Broschthomson.com

    Sent: Tuesday, June 20, 2006 10:35 AM

    To: kickstart-listredhat.com

    Subject: Using a DHCP server for two subnets

    

    





    





    Has anyone successfully used one DHCP to serve hosts on two subnets?

    

     

    

    If anyone can share their dhcpd.conf syntax, I would appreciate.  I think I have it correct because the DHCP server will issue:

    

     

    

    dhcpd: DHCPDISCOVER………;…230;……R30;……̷0;…..

    

    dhcpd: DHCPOFFER…̷0;………;…230;……R30;……̷0;…

    

    dhcpd: DHCPREQUEST…230;……R30;……̷0;………;…..

    dhcpd: DHCPACK230;……R30;……̷0;………;…230;……R30;..

    

     

    

    But then I immediately receive:

    

     

    

    in.tftpd[4254]: RRQ from 10.225.248.1 filename pxelinux.0

    

    in.tftpd[4254]: tftpd: read: Connection refused

    

     

    

    I am not sure if it is a dhcpd.conf configuration problem or not.  My switch has “port fast”; enabled.  I can Kickstart servers with no problem but when I introduce a second subnet into my dhcpd, tftp fails.

    

     

    

    How anyone ever seen this?

    

     

    

    I had tried this a few months ago but was never able to get around it but I have a need to revisit this now and get it working.

    

     

    

    Thanks.

    

     

    

    Liz Brosch

    

    TSH System Services

    

    Philadelphia, PA  19104

    

    office:  (215) 823-6144

    

    cell: ;    (267) 784-9166

    

     

    

    






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