DHCP through PIX firewall

Unanswered Question
Dec 30th, 2008
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I have a Site A and Site B at different geographical location,which are connected using Routers through leased line.

Now at both the location behind the router I have connected a Cisco PIX 515E firewall,behind the firewall I haveconnected L2 switch in both locations.At Site A all clients are connected to L2 switches,and a DHCP server isassigning a dynamic IP address for all clients,at Site B there are no clients but servers and a DHCP server are connected.

Now at Site A,if the DHCP server is down,how the clients will get the dynamic IP address from teh DHCP server which is at Site B.

Is it possible in this scenario?

Please help me I am in the process of desiging the DR site .

Thanks and Regards,


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Pravin Phadte Wed, 12/31/2008 - 02:51
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Are u running a Tunnel IPsec from both of this pix box ?

If you have then you can configure the pix as dhcp server

!--- Specifies a DHCP address pool and the interface for the client to connect.

dhcpd address outside

!--- Specifies the IP address(es) of the DNS and WINS server

!--- that the client uses.

dhcpd dns

dhcpd wins

!--- Specifies the lease length to be granted to the client.

!--- This lease equals the amount of time (in seconds) the client

!--- can use its allocated IP address before the lease expires.

!--- Enter a value between 0 to 1,048,575. The default value is 3600 seconds.

dhcpd lease 3600

dhcpd ping_timeout 50

dhcpd auto_config outside

!--- Enables the DHCP daemon within the Security Appliance to listen for

!--- DHCP client requests on the enabled interface.

dhcpd enable outside or inside

dhcprelay timeout 60

Check the link:



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