Netgear GSM7252PS 7000 Series Managed Switch Administration Guide for Software - Page 301

ProSafe 7000 Managed Switch Software Administration Manual, Release 8.0.3 Enable DHCP snooping in a VLAN. (Netgear Switch) (Config)# ip dhcp snooping vlan 1 Configure the port through which DHCP server is reached as trusted. (Netgear Switch) (Config)# interface 1/0/1 (Netgear Switch) (Interface 1/0/1)# ip dhcp snooping trust View the DHCP Snooping Binding table. (GSM7328S) #show ip dhcp snooping binding Total number of bindings: 1 MAC Address IP Address VLAN Interface Type Lease (Secs) 00:16:76:A7:88:CC 192.168.10.86 1 1/0/2 DYNAMIC 86400 Enable ARP Inspection in the VLAN 1. (Netgear Switch) (Config)# ip arp inspection vlan 1 Now all the ARP packets received on the ports that are member of VLAN are copied to CPU for ARP inspection. If there are trusted ports, it can configured as trusted port as in the next step. ARP packets received on the trusted ports are not copied to the CPU. Configure a port 1/0/1 as trusted. (Netgear Switch) (Config)# interface 1/0/1 (Netgear Switch) (Interface 1/0/1)# ip arp inspection trust Now ARP packets from the DHCP client will be through since it has DHCP snooping entry, however ARP packets from the static client is dropped, since it does have a DHCP snooping entry. It can be over come by static configuration as described in the "Configuring Static Mapping" on page 13-42. Web Interface: Dynamic ARP Inspection 1. Enable DHCP snooping globally. 13-36 v1.0, June 2010 Security Management