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I have a homegrown piece of software that "listens" to UDP traffic at 255.255.255.255:5010. It works just great on my home network, but does not work on other people's networks. I think that my equipment allows this sort of traffic through, while theirs does not.
How would I find out this setting? Is this a commonly "blocked" thing?
Also, I realize that this might not be a great way to send data, but I have no control on the server side, only the client side and the network.
I am on FIOS equipment (actiontec routers) looking for a "switch" to flip that would allow me to configure the other networks to work like mine.
These are not complex networks, there is a single router where the cable comes into the house and the other equipment (computers, tablets etc) are wired or wireless to that piece of hardware.
UPDATE:
On my network I have 3 "machines". Server 1, Server 2 and a super light client running on a Droid. Server 1 can send the data to the network (via PacketPlayer and a WireShark PCAP file). The Droid receives just fine. When I move the same setup to Server 2, the client does not get the data.
Maybe it is the firewall on Server 2 that is configured differently that Server 1?
JuddGledhill
Posted 2015-02-02T16:24:54.800
Reputation: 43
When talking about other people's networks, do you mean that both the sender and receiver are on the same network? Also, are they in fact in the same broadcast domain? Generally a broadcast will only reach other ports of the same switch/hub/bridge, but will not cross a router. (Home net devices are both-in-one.) – user1686 – 2015-02-02T18:47:40.490
Does your listener simply bind to '*:5010', or does it specifically limit itself by binding to '255.255.255.255:5010'? If it's the latter, then the problem may be on the sender side. Some OSes' network stacks don't really let you send to the 255.255.255.255 address; instead, they translate it into the subnet-broadcast address for each locally-connected subnet (e.g. 192.168.0.255). – Spiff – 2015-02-02T21:30:13.003
I put more info up in the question. But to answer the responses, sender and receiver are on the same network and subnet. My listener (Android Java) is binding a datagram listener to port 5010 only. I only have control over the server's general configuration (not the software sending the data), the receiver and the network. I am starting to think that this is a config issue on the server side - maybe maybe firewall? – JuddGledhill – 2015-02-03T16:24:35.680