JsSIP is currently trying to connect to audio (after accepting incoming call) to random ports over UDP. How can I restrict it to a specific to a port range for the audio?
Edit: Log from Asterisk
Exp:m=audio 63485 UDP/TLS/RTP/SAVPF 8 107 0 101 (here we got port 63485 which is out of range )
Asterisk port range for media should be configured in rtp.conf
default:
rtpstart=10000
rtpend=20000
Related
I need load balance server. LB should listen multiple ports and forward to backend servers with the same ports.
Logic for backed should be always send tcp requests to A server with same ports which is defined in LB server, and if A server is down forward to Server B.
Example:
LB port 10202 to Backend port 10202
LB port 10203 to Backend port 10203
Is it possible?
Unless I miss-understand then that sounds fairly simple. Just use a port range. Any port in the range is accepted and DONT specify the port on the backend i.e. keep the one you come in on:
listen L7_HTTP
bind 10.0.0.20:10202-10203
server RS001 127.0.127.1 check
server RS002 127.0.127.2 check
I was looking for an answer on my question on google and also here, but a didn't find a proper answer.
So here is the context:
I have a software running on some server (without firewall) in one subnet.
There is another software running on some PC in a different subnet.
Both subnets are connected to a gateway server. All computers are running CentOS or RHEL.
On the gateway server, there is a firewall, preventing multicast traffic from leaving the one subnet and allow clients from outside to connect to computers inside this subnet. Therefore xinetd is used. The computer from outside needs to send a packet to a specific port, the computer on the inside answers to another specific port depending on the sender. So there is no need for the gateway to keep track of sender-receiver relations. It just needs to forward UDP on specific ports to specific computers from one subnet to another.
So I added one service in /etc/services (for one direction):
udp-gateway 6000/udp
And created the according configuration file in /etc/xinetd.d/gateway like:
service udp-gateway
{
disable = no
socket_type = dgram
protocol = udp
wait = no
user = root
redirect = 192.168.1.1 6000 #Server inside the 192.168.1.0 subnet
}
Now the problem is, that the server doesn't open an UDP-port to listen on ('netstat -nulp' says). When I change the protocol to TCP and the socket_type to stream, it works. But I need this for UDP.
Is it possible that this is not possible for UDP? Or is netstat just not showing the ports? Or is my xinetd-configuration missing something?
Thanks in advance, every hint is appreciated.
Benny
redirect = 192.168.1.1 6000 #Server inside the 192.168.1.0 subnet
from the man page of xinetd:
redirect
Allows a tcp service to be redirected to another host.
This means usage of redirect for udp is not possible. And I don't see any other way to do this with xinetd.
Currently i have facing one problem in portrestrictedcone nattype.When my udp client hit the server with test1.dns.com (to sepcific IP 111.111.111.111 and this ip is bind with DNS test1.dns.com) where i am getting response from different IP and not with 111.111.111.111, however the same scenario is working for fullcone nattype. If the server response from the same above ip i am able to get the response.
Currently there are two services running on the server on UDP, one is which is working in portrestrictedcone and send response on same IP as a result i am getting the response, however second service is not behaving in same was as first service works.
i am running both the services on same DNS as i have describe above.
Can i get the help what i need to change on the server or client side to get this resolve?
I think your problem is that you are not sending the packet to the port you received it from (Allocated by NAT). When you receive a packet, check the port that was used to send it then send your response to that port and not to a predefined port because the NAT might change it.
Right now I have a client-server program that works over LAN. I have managed to ensure that traffic sent to my server gets past the firewall of my company. However, problems occur when the client is communicating from within a LAN - how can I make sure that traffic gets past the firewall/router of the client and to the machine?
Once the client has sent a packet of data the server analyzes this and is meant to send a response; however the server program seems to freeze after the following lines
Dim ip As String = (IPAddress.Parse(CType(ClientToManage.Client.RemoteEndPoint, IPEndPoint).Address.ToString())).ToString SendResponse = New TcpClient(ip, 8000)
Possible issues are:
- The server's firewall is blocking outgoing TCP traffic at port 8000.
- The client's firewall is blocking incoming TCP traffic at port 8000.
Adjusting your client's and/or server's firewall settings to allow incoming, respectively outgoing TCP traffic at port 8000 might fix the issue.
I ran port scan and it shows port 25 closed.
I turn off the firewall and it shows port 25 closed.
I set an inbound rule and outbound rule in the firewall to allow port 25 and it shows closed.
I check group policy and firewall group policy is not configured, which means is not taking effect(i think)
I turn off the antivirus and repeated all the steps above.
What do I do to open port 25 in windows 2008 r2 server?
Are you using a residential ISP? The majority of residential ISPs block port 25 to both prevent spam from compromised PCs and to ensure residential accounts aren't used for hosting.
You may want to check if your ISP blocks port 25 by researching online or contacting your ISP directly.