Directed broadcasting does not

I am trying to configure broadcasting to another network segment.  He has worked in the past, but since modernize us technologies (from unix to Windows platforms), it does not work.

Basically, I want the UDP traffic on port 3000 which comes from the IP 172.20.1.4/16 to be received by the host 192.168.25.107.  The two are connected directly to a router in 1941.

I tried many configuration changes, without success.  Here is my current setup:

interface GigabitEthernet0/0
IP 172.20.1.1 255.255.0.0
IP broadcast directed to 103
automatic duplex
automatic speed
No cdp enable
!
interface GigabitEthernet0/1
IP 192.168.250.40 255.255.255.0
automatic duplex
automatic speed
No cdp enable
!
interface GigabitEthernet0/0/0
IP 192.168.25.1 255.255.255.0
IP access-group 102 to
IP helper 172.20.1.4
IP broadcast directed to 103
IP accounting output-packets
automatic duplex
automatic speed
No cdp enable
!
interface GigabitEthernet0/1/0
IP 192.168.102.1 255.255.255.0
IP access-group 109 to
automatic duplex
automatic speed
No cdp enable
!
IP forward-Protocol ND
IP in avant-protocole udp 3000
!
no ip address of the http server
no ip http secure server
!
Driving IP profile
!
access-list 101 permit tcp 10.2.0.97 host any eq 3310
access-list 101 permit udp host 10.2.0.97 any eq 3310
access-list 101 permit icmp any one
access-list 101 deny ip any one
access-list 102 permit udp 192.168.25.0 0.0.0.255 any eq 3000
access-list 102 permit icmp any one
access-list 102 deny ip any one
access-list 103 allow host 172.20.1.4 udp any eq 3000
access-list 108 allow host 192.168.101.10 udp any eq 3320
access-list 108 allow the host tcp 192.168.101.10 any eq 3320
access-list 108 allow icmp a whole
108 refuse a whole ip access-list
access-list 109 allow host 192.168.102.10 udp any eq 3320
access-list 109 allow the host tcp 192.168.102.10 any eq 3320
access-list 109 allow icmp a whole
109 refuse a whole ip access-list
access ip-list 120 allow a whole
access-list 122 allow udp 192.168.25.0 0.0.0.255 any eq 3000
access-list 122 allow icmp a whole
access-list 123 permit udp host 172.20.1.4 any eq 3000
access-list 133 allow host ip 172.20.1.4 192.168.25.0 0.0.0.255
not run cdp
!
!
!
control plan
!
!
!
!
end

Any ideas?

You're definitely on the right track, and most of your config is ok. To support what you are trying to do with directed broadcast, you need three things in your config:

(1) you need the ip forward-Protocol udp 3000

(2) you need the IP helper to pass emissions

(3) you need the ip directed broadcast to allow the transfer of emissions.

The biggest problem is that your support address is on the wrong interface and it specifies the wrong address. Support address is configured on the interface where the emissions will be from. In your case, it would be Gig0/0 and not Gig0/0/0. Support address also specifies when the broadcast would be passed and in your case, that would be 192.168.25.255. If solve you the problem, then directed broadcast should work.

I see you have some ip directed broadcast to the configured Gig0/0. You don't need it there. It does no harm to have it, but it isn't good either. directed broadcast is needed only on interfaces that will receive the directed broadcast and must transfer the package as a local broadcast.

HTH

Rick

Tags: Cisco Network

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