0
votes
2answers
28 views

UDP sending two strings in a datagram

I'm wondering if its possible to send two strings within one datagram in a UDP packet. Assume I had string 1 with text: unix and string 2 with text: linux. I don't want to merge the strings but keep ...
0
votes
1answer
84 views

UDP commands for Linux and Mac?

I'm trying to test UDP between 2 terminals in the same machine. For instance: Terminal 1 UDP listener@port:3000 UDP sender to port:3001 Terminal 2 UDP listener@port:3001 UDP sender to ...
1
vote
0answers
40 views

setting up a local VoIP to use as a Wifi Headset

I had this idea of using Wi-fi in a vehicle to connect my cell to the car call handler.Just as it works with bluetooth nowadays. Just to demonstrate that such a thing is possible , i had three Linux ...
3
votes
1answer
128 views

listen to a conversation using port forwarding

I have been able to make a phone calls using the SIP client Pjsua from one Linux computer to another one. In case you have not heard of this user agent, explaining it's functionality is quite easy. It ...
1
vote
1answer
446 views

TCP buffers keep filling up (Recv-Q full): named unresponsive

Using netstat -an, I set the message that the Recv-Q is full. It is filling up to the rmem_max: Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address ...
2
votes
0answers
482 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 ...
3
votes
1answer
2k 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, ...
2
votes
1answer
382 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 ...
3
votes
2answers
498 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 ...
2
votes
2answers
287 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 ...