The udp tag has no wiki summary.
6
votes
2answers
6k views
How do I reserve ports for my application?
How do I reserve a list of ports for my custom applications?
To be specific, the product I'm creating has a lot of processes and a lot of intercommunication between them.
The problem I'm having is ...
4
votes
1answer
123 views
Alternative to DNS for internal servers
I am setting up my first network at work. All the servers are running CentOS 6.3 and have statically assigned IP addresses.
For example:
server1 192.168.0.101
server2 192.168.0.102
I want to be ...
3
votes
2answers
448 views
How to listen to all ports (UDP and TCP) or make them all appear open in Debian
I got an external Debian server. The problem is that my university campus doesn't allow connections to go outside when the port is different than TCP port 22, 80, 443, or UDP port 123. I tested them ...
3
votes
1answer
1k views
Run nmap via Tor
Is it possible to runnmap via Tor?
When I googled around, I got the impression that Tor uses Polipo / Privoxy, which are socks5 proxies. So any TCP / UDP aware applications should be able to use them ...
3
votes
1answer
408 views
Why isn't my application receiving broadcast packets?
I have written a Qt application that listens for UDP broadcast packets on the network interface p2p1. I have installed the application in Fedora 17 i386 in a VirtualBox VM. For some reason, the ...
3
votes
1answer
1k views
Why would my Linux host suddently stop receiving multicast? All other nics on private network are receiving
Here is my dilemma. Suddenly, as of yesterday, multicast packets are no longer being received from eth1 (private gigabit network) from one node. Routing between all the nodes is fine, no collisions, ...
3
votes
1answer
61 views
What are the requierements to sniff UDP packets in a Wireless Ad-Hoc network?
In a wireless Ad-Hoc network,
I have two computers which communicates in UDP together from 192.168.1.3 to 192.168.1.5
I have a third computer (192.168.1.6) which wants to listen to the packets which ...
2
votes
2answers
251 views
UDP multicasting broken after kernel update
I've got an embedded system which is running a stripped down Gentoo userland with a manually build kernel. The system acquires data from a PCI card and sends it out to an UDP multicast group.
All ...
2
votes
0answers
67 views
IPTables dropping UDP packet stream
I have a configuration where UDP packets containing encapsulated DNS data are sent to a KVM instance for processing. The KVM instance sits behind an IPtables firewall which is also doing NAT. The ...
2
votes
0answers
146 views
TPROXY for redirecting UDP on arbitrary ports
I want to intercept all UDP traffic leaving tap1. And possibly reply to e.g. DNS-requests. To accomplish this I wrote some python code listening to localhost and use iptables with a rule-set like ...
2
votes
0answers
189 views
Centos 6.3 Server ignoring IGMP Queries
I am using a centos 6.3 server to subscribe to UDP multicast data and I noticed that my server doesn't answer to the IGMP queries sent by the switch it is connected to.
As a result, when I open my ...
2
votes
1answer
467 views
I can SSH and HTTP, but not ping or access particular UDP services over my LAN
So I've encountered a weird problem when trying to set up a Linux server running a variant of CRUX Linux. I am trying to configure it to be a Teamspeak server, but no clients can connect. The ...
2
votes
0answers
387 views
Linux bridge blocks UDP packet from tap interfaces
Introduction: I'm working on a 6lowPAN projects of Wireless Sensor Networks. Basically, I have a set of nodes (Contiki OS) which are running on a linux host. Each nodes have its own tap interface ...
2
votes
1answer
326 views
ICMP destination unreachable
I am working on an Arch Linux machine with an ethernet interface eth1. I have created the interface eth1:0 using ifconfig and given it a dummy hardware address (00:01:02:03:04:05). When I send a UDP ...
1
vote
2answers
50 views
Can an arbitrary process read data coming to/from a network port? How?
For example, postgres does the following as shown with lsof -i:
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
postgres 29200 postgres 8u IPv6 470362 0t0 UDP ...
