I enabled dhcp server for my local LAN, and I setup my WAN interface as dhcp interface.
My ISP told me that my router is acting as dhcp server on WAN interface...and is not good for them. Can I stop my cisco router from sending dhcp offers on WAN interface, but send dhcp offers for my local LAN ?
ip dhcp pool LOCAL import all network 192.168.1.0 255.255.255.0 dns-server 193.x.x.x default-router 192.168.1.222 domain-name appt.ro lease infinite ! ip dhcp pool host1 host 192.168.1.11 255.255.255.0 client-identifier 0100.0ee8.e23d.94
interface FastEthernet0 mac-address 0019.66b3.d689 ip address dhcp ip nat outside ip virtual-reassembly speed auto full-duplex
I imagine that clients on the WAN side are sending requests with a GIADDR field that matches your DHCP pool's scope. In that case, the router would handout an address. You could add an ACL to the WAN interface to block incoming udp/68 packets:
access-list 101 deny udp any any eq 68
access-list 101 permit ip any any
ip access-group 101 in
That should prevent the router from seeing the client requests while still being able to get server responses.
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