Joe Quezada wrote:
>
> You need to use the "ip helper-address" interface command on your
> router. On the ethernet interface that does not have a DHCP server
> on it, use the #ip helper-address <DHCP IP Address> . On the DHCP
> server, add another scope with your other network addresses.
But be aware that the 'ip helper-address' causes many broadcasts to
be forwarded in addition to just DHCP, which you may not want to happen
(considering all the 'uninteresting' ones that will be unicast to your
DHCP server). Among the ones in the UDP forwarding list:
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)
isakmp Internet Security Association and Key Management Protocol
(500)
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)
pim-auto-rp PIM Auto-RP (496)
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)
To turn this back into a question, are all of these forwarded by
default? Is there a way to determine which ones are forwarded?
I generally use 'no ip forward-protocol udp xxx' for the more obvious
and noisy offenders that I want to be sure aren't forwarded just to be
sure, and they appear in the 'show config', so they must be enabled by
default.
Jeff Kell <[EMAIL PROTECTED]>
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