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Cisco CCNP / BCSI Examination Tutorial: Broadcasts Plus theCisco CCNP / BCSI Test Tutorial: Broadcasts Plus the IP Helper-Address CommandWhen routers take and create broadcasts, they don't ahead them. This can be very a problem every time a broadcast really should get to a tool for instance a DHCP or TFTP server that’s on a single side of the router with other subnets on one other side. If a Computer tries to Identify a DNS server by using a broadcast, the published will likely be stopped by the router and won't ever get for the DNS server. By configuring the ip helper-handle command around the router, UDP broadcasts for instance this may be translated right into a unicast with the router, building the interaction achievable. The command should be configured within the interface that may be acquiring the broadcasts.R1(config)#int e0R1(config-if)#ip helper-tackle ? A.B.C.D IP spot tackleR1(config-if)#ip helper-tackle one hundred.one.one.twoNow, you may be pondering if this command handles all UDP expert services. Sorry, you’re not getting off that effortless! The command does ahead eight typical UDP service broadcasts, nevertheless. TIME, port 37TACACS, port forty nineDNS, port 53BOOTP/DHCP Server, port 67BOOTP/DHCP Customer, port sixty eightTFTP, port 69NetBIOS identify assistance, port 137NetBIOS datagram service, port 138That’s about to protect most situations in which the ip helper-handle command are going to be useful, but what about People cases where by the broadcast you may need forwarded will not be on this listing? You need to use the ip forward-protocol command to add any UDP port amount for the listing.Moreover, to get rid of protocols within the default listing, make use of the no ip forward-protocol command. In the subsequent illustration, we’ll increase the Network Time Protocol port into the forwarding checklist when taking away the NetBIOS ports. Bear in mind, You should utilize IOS Assist to get an index of frequently filtered ports!R1(config)#ip ahead-protocol udp ? <0-65535> Port variety biff Biff (mail notification, comsat, 512) bootpc Bootstrap Protocol (BOOTP) consumer (sixty eight) bootps Bootstrap Protocol (BOOTP) server (67) discard Discard (nine) dnsix DNSIX protection protocol auditing (195) domain Domain Title Provider (DNS, fifty three) echo Echo (7) isakmp Online Security Association and Key Management Protocol (five hundred) mobile-ip Mobile IP registration (434) nameserver IEN116 name company (obsolete, 42) netbios-dgm NetBios datagram provider (138) netbios-ns NetBios identify provider (137) netbios-ss NetBios session provider (139) ntp Network Time Protocol (123) pim-car-rp PIM Automobile-RP (496) rip Routing Info Protocol (router, in.routed, 520) snmp Find more information Simple Community Management Protocol (161) snmptrap SNMP Traps (162) sunrpc Solar Remote Treatment Call (111) syslog Process Logger (514) tacacs TAC Access Manage Program (forty nine) talk Chat (517) tftp Trivial File Transfer Protocol (69) time Time (37) who Who provider (rwho, 513) xdmcp X Screen Manager Handle Protocol (177