Re: UDP problems
From: Knute Johnson (nospam_at_sagebrush.frazmtn.com)
Date: 01/31/04
- Next message: Neil Campbell: "Re: How to stop StackOverflowError"
- Previous message: Chiron Paixos: "Re: How to handle data validation in a JSP page."
- In reply to: Thomas Jollans: "Re: UDP problems"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Date: Sat, 31 Jan 2004 11:31:33 -0800
Thomas Jollans wrote:
> Matti Paalanen wrote:
>
>> Greetings!
>>
>> I have question regarding udp-communications.
>>
>> I've made a simple Gravity Force -style game with netgame option using
>> UDP but I'm having strange problems with connections. I first tested
>> the network-game by spawning two different instances of the game
>> program on my computer and then made the connection between them using
>> my local ip. Game worked fine.
>>
>> But when I try to play the game with friends over internet, strange
>> problems evolve: When a friend of mine hosts the game and opens a
>> port, messages I send arrive safely without any problems, but none of
>> the messages he sends arrive to my end. The host checks the ip from
>> the first arriving packet and uses it in the communication.
>> (DatagramPacket in and in.getAddress()) The port all clients are using
>> as the receiving one is 44444 and this is hardcoded into server also.
>>
>> Well, we tried different combinations with a few friends, and then
>> suddenly two of them were able to estabilish communication and were
>> able to play the game normally. Two other couldn't get any of the
>> messages to arrive.
>>
>> I also made TCP version, and none of us had any problems with
>> connections, but the game was of course pretty laggy, so UDP is the
>> only reasonable choice.
>>
>> Another weird thing (at least I think it's weird) is that I can ping
>> and traceroute the friends from whom i can't receive any packets, and
>> they can ping and traceroute me.
>>
>> So what would be the best way to advance from here? My software
>> firewall never complains about any messages, so it's quite evident
>> that the messages stop at my friends host when going outwards, or at
>> my host before coming to my adsl-modem. I don't know much about
>> restrictions and port-politics, so should I change the port numbers or
>> what would be the reason for this kind of lack blocking? Is it common
>> that UDP traffic is completely cut off this way?
>>
>> -Matti Paalanen
>
>
> sounds like something in the firewall, as you don't get any errors just
> the packet gets lost. i don't think a port change would help as you are
> probably using s port that is not likely to be used anyway, so either
> it's open or shut (for security). you obviously can't use any standard
> port as it may be used. i would firsttry shutting down the personal
> firewall and then (if it doesn't work) use tcp (although that is slo)
>
> thomas
Are you behind a router? If so you need to forward port 44444 to your
specific computer.
-- Knute Johnson email s/nospam/knute/ Molon labe...
- Next message: Neil Campbell: "Re: How to stop StackOverflowError"
- Previous message: Chiron Paixos: "Re: How to handle data validation in a JSP page."
- In reply to: Thomas Jollans: "Re: UDP problems"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Relevant Pages
|
