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Re: Hi [1:2287] posted 03/02/2001
|
By default Cisco Routers will not forward broadcast traffic.
DHCP uses UDP for its transport and BOOTP for its operation.
The “IP helper-address X” where X is the address of the DHCP
server or a directed broadcast is the only command you need on the router to
ensure it relays the DHCP requests.
Make sure you configure this helper-address on the client side of the router.
For Example
!
interface ethernet 0
ip address 10.10.20.1
ip helper-address 10.10.10.101 255.255.255.0
DHCP SERVER
10.10.10.101
| Router 1
| ------------------------------
____(E1)10.10.10.1 (E0)10.10.20.1___
-------------------------------
|
10.10.20.10
DHCP CLIENT
The helper-address is just a short hand method of forwarding a group of
common protocols that would not normally be forwarded.
In other words instead of using a group of commands like
“ip forward-protocol udp 67”
“ip forward-protocol udp 68” e.t.c.
You instead just use “ip helper-address X”
and a group of CISCO selected protocols are forwarded:
TFTP 69
DNS 53
BOOTP 67 and 68 e.t.c.
Message Posted at:
http://www.groupstudy.com/form/read.php?f=1&i=2313&t=2287
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