IP Helper Address Command
Routers or Multilayer Switches cannot forward broadcasts, but enabling the IP Helper Address command allows it to forward UDP broadcasts and forward them as a unicast to the address specified. The command “ip helper-address” must be configured on the interface/VLAN receiving the broadcasts. On a MLS for all users in VLAN 10 then the IP Helper Address must be configured on the VLAN SVI.
interface vlan 10
ip helper-address 10.10.10.1
Continue reading “CCNP ROUTE 2.0: IP Helper Address, Debug IP Packet, Identifying Memory Issues & Core Dumps”
DHCP snooping is a security feature that provides security by filtering untrusted DHCP messages. DHCP snooping functions when all DHCP servers connected to the switch are configured as trusted interfaces, when a rogue DHCP server is connected to untrusted interface DHCP snooping will drop the DHCP packets.
This post describes configuration of DHCP snooping on an HP ProCurve 2610 switch.
Configuring DHCP Snooping
Configure the VLAN with an IP Helper Address for the DHCP Server
ip helper-address 192.168.20.20
Enable DHCP Snooping globally on the switch
Enable DHCP Snooping on the required VLANs
dhcp-snooping vlan 1-40
Continue reading “Configuring DHCP Snooping on HP ProCurve Switches”