DHCP server problem

[devhunjan5]

Hi everyone,I am connected in a lan environment and my default gateway is firewall and i want that the dynamic address I get,I get from the firewall.

but in between firewall and my system  there is a wireless router which also serves as a dhcp server for wireless client.now whrn I asked for ip address from dhcp server, I get the address from the router not from the firewall.

Is there any way so that I can bypass the router and get the IP address from the firewall instead of the router.

cant bind the mac address with the firewall as there are many users and cant bind for each one as it is time consuming.

[Philip D'Ath]

Turned off the DHCP server on the wireless router.

[devhunjan5]

I cant,as the router provides IP addresses to mobile users.

[Georg Pauwen]

Hello,

are both the LAN and wireless clients in the same IP address range ? Is there a layer 3 interface (SVI) between the LAN and the firewall ? If so, use the 'ip helper-address' command on that layer 3 interface, with the IP address being that of your firewall.

If that is not an option for you, post the config of your Cisco device...

[paul driver · Accepted solution]

Hello

in between firewall and my system  there is a wireless router

Do you mean your lan switch(s) are attached to the WLAN AP or is this AP just on the same segment.

You can try and set a mac and/or ip acl to drop any DHCP traffic originating from the base mac address of the AP for any particular vlans.

Example:
AP dhcp server
mac address A111.1111.1111
1.1.1.1/24

Lan subnet vlan10
10.10.10.0/24

mac address-table static A111.1111.1111 vlan 10 drop

or

ip access-list extended STAN_in
deny   udp 10.10.10.0 0.0.0.255 eq 67 host 1.1.1.1 eq 68
deny   udp host 1.1.1.1 eq 68 any eq 67
permit ip any any

res
Paul

[devhunjan5]

yeah that helps me a lot.thanks I did the same and problem solved.

now I am getting the IP address from my intended DHCP server.