Firewall DHCP

[smavashev]

Is there a way to configure a DHCP server for my internal subnet of 192.168.20.1 which is on a 3550 layer 3 switch from my 5505 ASA Firewall.

My subnet of 10.1.1.0/30 is connecting my 5505 to 3550. All I'm trying to do is run a DHCP server down to my hosts. The only options on ASA 5505 is

dhcpd address 192.168.20.1 - 192.168.20.254 outside or inside, which conflicts with my subnet of 10.1.1.0 used to connect my internal subnet of 192.168.20.1 for the whole network.

When I used my router it did not need the (inside, outside) keywords and just an ip helper-address command. How do I configure my my firewall DHCP server to propogate the 192.168.20.0 network through my 10.1.1.0 connection.

Thanks,

in advance

Sergei.

[cadet alain · Accepted solution]

Hi,

in configuration guide of ASA  it is clearly stated :

"

You cannot configure a DHCP client or DHCP Relay  services on an interface on which the server is enabled. Additionally,  DHCP clients must be directly connected to the interface on which the  server is enabled.

The security appliance assigns a client one of the  addresses from this pool to use for a given length of time. These  addresses are the local, untranslated addresses for the directly  connected network."

So you'll have to configure the pool on the switch or on a server.

Regards.

Alain

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[smavashev]

1) Thanks, but on my 3550 switch I could not configure a dhcp server either becuase there is no ability to do that is there ???

I tried before but couldn't so I had to use a router, my router stopped booting up, someone said it's a memory issue. I tired using the firewall but as I found out now, there is no way to configure it for dhcp. So I basically need a live DHCP server. Could you help me out and find out if you can configure DHCP on a 3550 cause if not, then I'm stuck.

2) Then maybe somone can tell me why my 2800 router stopped booting up completely, nothing shows. If it's the memory or not ???

[cadet alain]

Hi,

1) of course you can do dhcp server with the 3550. what happened when you tried?

   what is the output of sh run | i service dhcp  ?

Regards.

Alain

Don't forget to rate helpful posts.