The "command ip helper-address" enables forwarding for eight UDP ports - time (37),
TACACS (49), DNS (53), BOOTP/DHCP Server (67), BOOTP/DHCP Client (68), TFTP (69),
NetBIOS Name Service (137) and NetBIOS Datagram Service (138). However, there may be
times when you want to forward other UDP ports besides these 8.
The command "ip-forward protocol" gives you more granularity over forwarding UDP
datagrams. You literally can forward any UDP port from 0-65535 if you should so
choose. Here's the output of the options which can be used with "ip forward-protocol"
for Cisco IOS 11.2:
<0-65535> Port number
biff Biff (mail notification, comsat, 512)
bootpc Bootstrap Protocol (BOOTP) client (68)
bootps Bootstrap Protocol (BOOTP) server (67)
discard Discard (9)
dnsix DNSIX security protocol auditing (195)
domain Domain Name Service (DNS, 53)
echo Echo (7)
mobile-ip Mobile IP registration (434)
nameserver IEN116 name service (obsolete, 42)
netbios-dgm NetBios datagram service (138)
netbios-ns NetBios name service (137)
netbios-ss NetBios session service (139)
ntp Network Time Protocol (123)
rip Routing Information Protocol (router, in.routed, 520)
snmp Simple Network Management Protocol (161)
snmptrap SNMP Traps (162)
sunrpc Sun Remote Procedure Call (111)
syslog System Logger (514)
tacacs TAC Access Control System (49)
talk Talk (517)
tftp Trivial File Transfer Protocol (69)
time Time (37)
who Who service (rwho, 513)
xdmcp X Display Manager Control Protocol (177)
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Kent
> Sent: Wednesday, August 16, 2000 9:43 AM
> To: [EMAIL PROTECTED]
> Subject: RE: ip forward-protocol vs. ip helper-address
>
>
> Hi all,
>
> In the following config, which was cut from the CD,
> why would we need the "ip forward-protocol" there,
> I though the ip-helped address would do the job, to
> forward all the broadcast to the servers, is that
> right?
>
> Thanks
>
> Kent
>
> "In the following example, one router is on network
> 191.24.1.0 and the other is on network 110.44.0.0, and
> you want to permit IP broadcasts from hosts on either
> network segment to reach both servers. Figure 14
> illustrates how to configure the router that connects
> network 110 to network 191.24.1.
>
>
> Figure 14: IP Helper Addresses
>
> The following example shows the configuration:
>
> ip forward-protocol udp
> !
> interface ethernet 1
> ip helper-address 110.44.23.7
> interface ethernet 2
> ip helper-address 191.24.1.19
>
>
>
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