At 05:14 PM 9/26/01, Brian wrote:
>Yeah I always thought the helper address command was the way to get a whole
>bunch of nonroutable junk forwarded.
It gets a bunch of UDP broadcasts forwarded.
I figured out the ip dhcp-server command. It's not a replacement for ip
helper-address. It's for access servers. It's only documented in access
server documentation and documentation for the Gateway General Packet Radio
Service (GPRS) Support Node (GGSN), whatever that is. The GGSN provides
services to wireless devices, that much I know, and it's sort of an "access
server" for the purposes of this discussion.
So dial-up users, wireless users, etc. reach the Internet or corporate
intranet through the access server. With ip dhcp-server you can make sure
the access server gives these users an IP address because it forwards their
requests (or asks on its own) to a DHCP server. Note that if the DHCP
server is not on the same LAN as the access server, then you need to
configure ip helper-address on intermediate routers between the access
server and DHCP server.
ip helper-address is also used for the more common situations, for example,
when clients are on a different LAN than the DHCP server. ip dhcp-server
didn't work in this case, per my previous message.
I'd love to hear any more uses for ip dhcp-server if they exist. I would
think that "access server" could also mean a DSL or cable modem router, but
I don't see any evidence of the "ip dhcp-server" command being documented
for those environments.
(The command definitely doesn't turn the router into a DHCP server a I
originally said, sorry. I feel sort of justified for that mistake, though
since the other "ip dhcp" commands do that. ;-)
Priscilla
> Bri
________________________
Priscilla Oppenheimer
http://www.priscilla.com
Message Posted at:
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