I am running 12.1 and I do not have a ip dhcp server (address). Are you
suggesting to
configure my router as a DHCP server? No, we have a win nt dhcp server
running.
Our win nt servers are reciving a lot of broadcasts because of some kind of
election for
a master browser (NT thing). That means that our routers are passing
unnessary
broadcast. I tried to specify broadcasts only for port 66 and 67 (dhcp
ports ) but it
is not showing up in my config, it could be enable by default.
Here is a copy of config on my router:
! Last configuration change at 16:27:46 cdt Tue Sep 25 2001
! NVRAM config last updated at 16:27:48 cdt Tue Sep 25 2001
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
service password-encryption
clock timezone cst -6
clock summer-time cdt recurring
ip subnet-zero
ip cef
ip domain-name nsuok.edu
ip name-server 192.78.4.156
ip name-server 192.78.4.158
!
!
!
!
interface Vlan1
description (vlan 1) Management Vlan
ip address 172.16.1.1 255.255.0.0
ip helper-address 192.173.45.15
ip directed-broadcast
!
interface Vlan2
description A
ip address 172.17.1.1 255.255.0.0
ip helper-address 192.173.45.15
ip directed-broadcast
!
interface Vlan3
description B
ip address 172.18.1.1 255.255.0.0
ip helper-address 192.173.45.15
ip directed-broadcast
!
interface Vlan4
description C
ip address 172.19.1.1 255.255.0.0
ip helper-address 192.78.4.47
ip directed-broadcast
!
Tim Booth wrote:
> Alex,
>
> Ip dhcp server [address | name] will solve your problems (IOS 11.0 and
> later). As far as the problems you're having with the NETBEUI traffic and
ip
> helper, you need to make sure you have protocol forwarding enabled, and
> transparent or source-route bridging properly configured aka UDP flooding.
> This solution is much more lengthy and cumbersome than the ip dhcp server
> command for dhcp broadcast forwarding.
>
> As I found on the cisco site, with ip directed-broadcast the only
> protocols that are forwarded are those that are specified with the ip
> forward-protocol command. By default (IOS 12.0 and later), ip
> directed-broadcast is disabled, and all directed ip broadcasts are dropped.
> This command translates from directed broadcasts to physical broadcasts. I
> think what is meant by a directed broadcast is a subnet (or possibly
> multicast?) and a physical broadcast is meant as 255.255.255.255, and would
> be forwarded out all interfaces (?).
>
> Hope this helps,
> Tim Booth
>
> ----- Original Message -----
> From: "khramov"
> To:
> Sent: Tuesday, September 25, 2001 2:57 PM
> Subject: DHCP [7:21051]
>
> > Hello
> > How do I enable broadcast for DHCP server? I know that ip
> > helper enables UDP broadcast, but broadcast of netbios
> > services causes some problems for win nt server. So I guess
> > to be more specific what can I do to forward udp broadcast on
> > ports 67 and 68 only?
> >
> > And another question that I have what exactly ip
> > directed-broadcast command does? I've searched Cisco's web
> > site but I never came across a clear defenition?
> >
> > Thanks,
> > Alex
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