I am still not seeing my UDP broadcasts, IP src: 172.16.1.1, IP dst: 172.16.255.255, port 4002 on vlan 100. Also, the device 172.16.1.1 does not have any gateway capability, meaning I cannot give it a gateway address. A computer on the 172.16.1.x network with a gateway of the vlan 100 IP address (10.1.1.190) does ping in both directions (i.e. 172.16.1.x subnet to the vlan 100 and vlan 100 to the 172.16.1.x subnet). I do so see broadcasts on the GigabitEthernet0/0/0 interface when in run the "show interface GigabitEthernet0/0/0" command in the console. I do not see any broadcasts when I run the "show interface vlan 100" command for vlan 100 on the console. Here is my current configuration: interface GigabitEthernet0/0/0 ip address 172.16.1.26 255.255.255.0 ip helper-address 172.16.255.255 ip directed-broadcast negotiation auto no shutdown interface Vlan100 ip address 10.1.1.190 255.255.255.0 ip directed-broadcast ip forward-protocol udp 4002 Any and all responses are appreciated!
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Hello all, For an internal network, I need to be able to bring in UDP broadcast packets from one network into another network. The network where the UDP broadcast packets originate is ip source: 172.16.1.1 with a destination of 172.16.255.255; port 4002 on that network. I am bringing this into an ISR4431 WAN port, from there, into a vlan. The WAN port has an ip address of 172.16.1.26, 255.255.255.0. The vlan is setup as vlan 100 with an ip address of 10.1.1.190. There are multiple devices on the vlan in which a few of the devices need to access these packets. The ip routing command has been turned on in the ISR4431. However, I do not have a default ip route, as of this moment. My current understanding of UDP broadcast forwarding techniques is that the incoming interface GigabitEthernet0/0/0 needs to have the ip helper-address for the destination subnet, 10.1.1.255. Also, vlan 100 needs the ip directed-broadcast 104, with 104 being my access-list with port number 4002. This does not seem to work. Any ideas? Any advice or recommendations are appreciated! Here is my configuration: ip routing interface GigabitEthernet0/0/0 ip address 172.16.1.26 255.255.255.0 ip helper-address 10.1.1.255 no shutdown access-list 104 permit udp 172.16.0.0 0.0.255.255 eq 4002 10.1.1.0 0.0.0.255 eq 4002 interface Vlan100 ip address 10.1.1.190 255.255.255.0 ip directed-broadcast 104 no shutdown
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