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Cisco CCNP / BCSI Examination Tutorial: Broadcasts As well as theCisco CCNP / BCSI Exam Tutorial: Broadcasts As well as the IP Helper-Address CommandAlthough routers settle for and deliver broadcasts, they don't forward them. This can be very a challenge when a broadcast needs to get to a tool like a DHCP or TFTP server that’s on one aspect of a router with other subnets on one other side. If a Personal computer makes an attempt to Find a DNS server having a broadcast, the published will be stopped by the router and will never get to the DNS server. By configuring the ip helper-tackle command within the router, UDP broadcasts like this could be translated into a unicast because of the router, building the communication attainable. The command ought to be configured over the interface that should be acquiring the broadcasts.R1(config)#int e0R1(config-if)#ip helper-address ? A.B.C.D IP vacation spot handleR1(config-if)#ip helper-handle 100.one.1.twoNow, you might be wondering if this command addresses all UDP expert services. Sorry, you’re not finding off that easy! The command does ahead eight frequent UDP service broadcasts, although. TIME, port 37TACACS, port forty nineDNS, port 53BOOTP/DHCP Server, port 67BOOTP/DHCP Shopper, port sixty eightTFTP, port sixty nineNetBIOS title support, port 137NetBIOS datagram service, port 138That’s gonna go over most eventualities where the ip helper-tackle command will likely be beneficial, but what about People conditions wherever the printed you would like forwarded will not be on this record? You can use the ip forward-protocol command to add any UDP port selection on the list.Also, to eliminate protocols from the default listing, utilize the no ip ahead-protocol command. In the next illustration, we’ll add the Network Time Protocol port to the forwarding record though eradicating the NetBIOS ports. Keep in mind, You can utilize IOS Enable for getting a summary of frequently filtered ports!R1(config)#ip ahead-protocol udp ? <0-65535> Port range biff Biff (mail notification, comsat, 512) bootpc Bootstrap Protocol (BOOTP) consumer (68) bootps Bootstrap Protocol (BOOTP) server (sixty seven) discard Discard (nine) dnsix DNSIX security protocol auditing (195) domain Domain Title Service (DNS, fifty three) echo Echo (seven) isakmp World-wide-web Security Affiliation and Important Administration Protocol (500) cellular-ip Cell IP registration (434) nameserver IEN116 title support (obsolete, 42) netbios-dgm NetBios datagram company (138) netbios-ns NetBios title support (137) netbios-ss NetBios session service (139) fast ntp Network Time Protocol (123) pim-car-rp PIM Auto-RP (496) rip Routing Data Protocol (router, in.routed, 520) snmp Basic Community Management Protocol (161) snmptrap SNMP Traps (162) sunrpc Sunlight Remote Procedure Simply call (111) syslog Procedure Logger (514) tacacs TAC Accessibility Manage Procedure (forty nine) chat Speak (517) tftp Trivial File Transfer Protocol (sixty nine) time Time (37) who Who assistance (rwho, 513) xdmcp X Display Supervisor Manage Protocol (177