[Dnsmasq-discuss] Single interface, multiple subnets...

Simon Kelley simon at thekelleys.org.uk
Mon Sep 27 20:33:46 BST 2010

Scott wrote:
> The DHCP relay is the router itself, ip helper is configured which forwards
> the packets.  Again, the dhcp requests are being received by the dhcp
> server, it simply won't serve out the address.  One thing I did forget to
> mention is that I have mac reservations for each server.
> The issue however, is not in the routing.  If I take server1 and modify the
> reservation to an IP in the dhcp server's subnet (, the
> dhcp server gives it an address.  It's only when I tell the dhcp server to
> give it an IP in the subnet that it gives the error:  "Sep 24
> 12:45:47 server1 dnsmasq[2640]: no address range available for DHCP request
> via eth0".

Something is wrong somewhere: if the ip helper was doing the correct 
thing and setting the giaddr field in DHCP packet then the message would 
say "....DHCP request via w.x.y.z" and not "via eth0". Can you check 
that your DHCP relay is set up properly?


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