Serving addresses to multiple subnets

John Tabasz (jtabasz) jtabasz at cisco.com
Wed Oct 7 20:49:03 UTC 2009


Hi,

 

I have a Cisco router with a secondary interface on one of the physical
interfaces, e.g. 

 

Int fa0

   Ip address 10.1.100.0 netmask 255.255.255.0

   Ip address 10.1.200.0 netmask 255.255.255.0 secondary

 

My dhcp server is sending addresses to the primary subnet, but not to
the secondary subnet.

There are subnet declarations for both subnets:

 

subnet 10.1.100.0 netmask 255.255.252.0 {

option routers 10.1.100.1;

  option subnet-mask 255.255.252.0;

  option domain-name-servers x.x.x.x;

  option domain-name "mydomain.com";

deny unknown-clients;

} 

 

 

subnet 10.1.200.0 netmask 255.255.254.0 {

option routers 10.1.200.1;

  option subnet-mask 255.255.254.0;

  option domain-name-servers x.x.x.x;

  option domain-name "mydomain.com";

deny unknown-clients;

}

 

And fixed address declarations for each of the hosts I want to serve
addresses to. 

I can see the requests hitting the interface on my dhcp server via
snoop, but no response is forthcoming. 

 

Any ideas?

 

Thanks,

 

John

 

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