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Cisco CCNP / BCSI Exam Tutorial: Broadcasts And TheCisco CCNP / BCSI Test Tutorial: Broadcasts As well as IP Helper-Address CommandWhile routers acknowledge and make broadcasts, they do not forward them. This can be pretty a difficulty when a broadcast really should get to a device for instance a DHCP or TFTP server that’s on just one aspect of the router with other subnets on another side. If a Laptop tries to locate a DNS server which has a broadcast, the broadcast is going to be stopped by the router and won't ever get for the DNS server. By configuring the ip helper-tackle command on the router, UDP broadcasts like this tends to be translated into a unicast through the router, making the conversation probable. The command really should be configured within the interface that can be getting the broadcasts.R1(config)#int e0R1(config-if)#ip helper-handle ? A.B.C.D IP vacation spot deal withR1(config-if)#ip helper-handle one hundred.one.one.2Now, you could be questioning if this command addresses all UDP expert services. Sorry, you’re not obtaining off that easy! The command does ahead 8 frequent UDP assistance broadcasts, however. TIME, port 37TACACS, port 49DNS, port fifty threeBOOTP/DHCP Server, port 67BOOTP/DHCP Customer, port sixty eightTFTP, port 69NetBIOS name provider, port 137NetBIOS datagram service, port 138That’s about to address most eventualities wherever the ip helper-handle command will be practical, but what about Those people scenarios the place the printed you need forwarded is just not on this checklist? You can use the ip ahead-protocol command to incorporate any UDP port variety on the record.In addition, to get rid Find more info of protocols within the default listing, use the no ip forward-protocol command. In the subsequent instance, we’ll incorporate the Community Time Protocol port to your forwarding record when eradicating the NetBIOS ports. Don't forget, You should use IOS Assistance for getting an index of commonly filtered ports!R1(config)#ip forward-protocol udp ? <0-65535> Port number biff Biff (mail notification, comsat, 512) bootpc Bootstrap Protocol (BOOTP) client (68) bootps Bootstrap Protocol (BOOTP) server (67) discard Discard (nine) dnsix DNSIX safety protocol auditing (195) domain Domain Identify Services (DNS, fifty three) echo Echo (7) isakmp Online Stability Affiliation and Key Management Protocol (five hundred) cell-ip Cellular IP registration (434) nameserver IEN116 title service (out of date, 42) netbios-dgm NetBios datagram assistance (138) netbios-ns NetBios title support (137) netbios-ss NetBios session services (139) ntp Network Time Protocol (123) pim-vehicle-rp PIM Vehicle-RP (496) rip Routing Info Protocol (router, in.routed, 520) snmp Easy Network Management Protocol (161) snmptrap SNMP Traps (162) sunrpc Sunshine Distant Course of action Simply call (111) syslog Process Logger (514) tacacs TAC Accessibility Regulate System (49) talk Chat (517) tftp Trivial File Transfer Protocol (sixty nine) time Time (37) who Who company (rwho, 513) xdmcp X Show Manager Regulate Protocol (177