Networking :: Raw SCTP Socket Cannot Bind With Port?

Jul 26, 2010

If I open a raw SCTP socket, am I able to bind to a specific port? (I only want to see SCTP packets from a particular IP address AND port.) Or, any raw SCTP socket, regardless of port binding , will get all SCTP packets received by the OS from that IP address? The port doesn't matter and is ignored.

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Networking :: Unable To Close SCTP Socket

Jun 16, 2011

I create SCTP socket with port number 60011. The SCTP socket descriptor value is 18.
When I try to close the socket with the socket descriptor, sometimes it is not closed without errno.

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Programming :: Bind A PF_PACKET Socket To A Specific Port Number?

Sep 26, 2010

I am trying to create a socket to listen for a bootp response so I am using a PF_PACKET socket so that I get the response based on my mac. My problem is that I don't want to hear all traffic (as I do now) so would like to use a specific port number and bind to it.

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Programming :: Bind The Listening Socket To A Paricular Ip Address And Port?

Jun 26, 2011

I am learning network prgramming in linux in c,and try to build a server and in this server I want to bind the listening socket to a paricular Ip address and port.Bind function is showing error,I did not want to use wild card. Here is the code.

#include<stdio.h>
#include<sys/socket.h>
#include<strings.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<string.h>

[Code]...

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General :: Using SCTP Socket In Red Hat Enterprise?

Mar 12, 2010

I want to use SCTP socket in red hat enterprise.

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Networking :: MULTICAST Address And Port - Socket Listen Only On Port?

Feb 12, 2009

I make an application on GNU/Linux which listening on a MULTICAST stream, so I open my unconnected socket, bind it on a MULTICAST address and a port, join the multicast group with the "setsockopt (IP_ADD_MEMBERSHIP)", then I receive datagram on my socket.

Now I've two different instances of the same application that run with their own MULTICAST address and port. And what I found strange is that, after a misconfiguration, I switch the ports, for example:

Emitting on 225.0.0.1/23451 and 225.0.0.2/23452
Receiving on 225.0.0.1/23452 and 225.0.0.2/23451

And my receiving part doesn't care about the MULTICAST address, it looks like the socket is listening on the port number only! I mean that the receiver [225.0.0.1/23452] take its datagrams from emitter [225.0.0.2/23452] and vice-versa!

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Networking :: Can't Bind Send Socket: Address Already In Use

Feb 23, 2009

I am currently trying to get a B.A.T.M.A.N mesh network up and running. the thing uses UDP port 4305 for broadcasting to nearby nodes and it seems this port is closed or used by something else.

now i have tried to open this port with commands like

Code:

iptables -A INPUT -p udp --dport 4305 -j ACCEPT
iptables -A OUTPUT -p udp --dport 4305 -j ACCEPT

it still gives me the same error saying the socket cannot connect.any way for me to scan that udp port, see what is blocking it and open the thing up ?

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Fedora Networking :: Root Can Not Bind Socket On Lower Ports (<1024)?

May 9, 2010

I am encountering a wierd problem in FC12. When I try to lunch a program that listens to a lower port such as 80 or any one that is less than 1024, I always get "Permission denied" error message (I am running it as root!).Then I try starting httpd service daemon that listens to 80, no errors, the daemon started and listend to 80.PS: I checked selinux, it has been disabled.Do you have any knowledge on this case? BTW, the kernel version is:2.6.31.5-127.fc12.i686.PAE #1 SMP Sat Nov 7 21:25:57 EST 2009 i686 i686 i386 GNU/Linux

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CentOS 5 :: SCTP Setsockopt Failed Error Code 22 (invalid Argument For SCTP Events)?

Mar 11, 2009

We Are Using Centos 5 64Bit with Kernel 2.6.18.92 with Amd Athlon ProcessorThe problem when calling setsockopt it return error errno:22 InvalidargumentThis code run on Macos ,Sunsolaris ,But fail to execute on Centos 5 64bit & The SCTP mailing group told me that this problem belongs to centosexample form ibm webside

/*
server
*/

[code]....

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Networking :: TCP And UDP Socket On Same Port ?

Nov 20, 2009

Can we open TCP and UDP socket on same port number?

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Networking :: Socket Programming - Connect To Port Y On IP X With Telnet

Sep 16, 2010

I have a customer who is complaining that they can connect to prt y on IP x with telnet. They are seeing the following:

telnet x.x.x.x y
Trying x.x.x.x...
Connected to x.x.x.x.
Escape character is '^]'.

after some time the connection of course times out. Connection closed by foreign host. There is no telnet service running on this port so they cannot do anything, but they are complaining tht the fact that telnet "connects" is a security risk. I am having difficulty explaining why they are able to connect with telnet. I know it has to do with the socket layer API in Linux but I am having difficulty explaining this sufficiently. I also can't just say "this is the way linux works" to them. I am looking through "UNIX Network Programming" by W.

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Networking :: Fedora 11 Gnome Application Can't Connect To Socket Port 8005

Jul 3, 2009

I have an x application I am trying to run under gnome. It assumes a fixed ip address and exclusive use of the eth0. I have run it under gnome on RHEL 5.3. I set the ip address and ifconfig confirms the correct address. When I run it I get "SocketConnect() error:

Resource temporarily unavailabele, port 8005. (on the terminal that I started it)

This is indicative that it has failed to make a connection to the outside world. One difference I notice between the non-working and the working is that, the error message seems to stop coming out on the fedora gnome, almost immediately, whereas on the other installations it will come out indefinitely until it connects. is virb0 interferring. What is different in the networking on fedora 11 then RHEL?

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Networking :: Using A Perl Script To Test For A Socket Listening On A UDP Port On A Remote Host?

Mar 10, 2011

is it possible using a perl script to test for a socket listening on a UDP port on a remote host ?I work in an environment where netcat is not allowed and from time to time I need to see if a UDP port is open on a remote host.

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Programming :: Name A Socket By Bind?

Oct 20, 2010

How does bind system call names a socket.Code:bind(server_sockfd, (struct sockaddr *)&server_address, server_len);I see use of bind in majority of programms as above.But any of the arguments is not the name of socket.

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Fedora Networking :: Sshd Can't Bind To Non Standard Port After FC14 Upgrade

Feb 5, 2011

I just upgraded from FC 13 to FC 14. I run an ssh server on a port in the 3000s (call it 3xxx, to protect the innocent). When I try to start sshd with the "Port 3xxx" option in sshd_conf, I get the following error in /var/log/secure

sshd[5104]: error: Bind to port 3xxx on 0.0.0.0 failed: Permission denied.
sshd[5104]: error: Bind to port 3xxx on : : failed: Permission denied.

I did not use to have this problem in FC 13. how I can give sshd the necessary permissions now?

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Security :: Port-bind Shellcodes Work With Port-forwarding?

Apr 27, 2011

I'll explain this in one sentence: Is it possible to program a port-binding shellcode in which people across the Internet can connect to, without being thwarted by the router blocking their data because the port its bound to doesn't allow port-forwarding

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Programming :: User Mode Permission Denied To Bind To Socket?

May 3, 2011

In user mode [non-root] linux machine, tried to bind a socket by using a"ioctl(iInterfaceSocket, SIOCSIFADDR, &stCommand)". I am getting error 13 -> Permission denied because of user mode. If change from usermode to kernel mode everything works fine.I need to bind the socket in user mode only, please suggest solution for the abovewhile explaining the above,

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Fedora Servers :: OpenVPN - Socket Bind Failed On Local Address

May 4, 2011

I finally got the certs to configure:
openvpn --config server.conf
Tue May 3 17:26:27 2011 OpenVPN 2.1.1 i686-redhat-linux-gnu [SSL] [LZO2] [EPOLL] [PKCS11] built on Jan 5 2010
Tue May 3 17:26:27 2011 NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables
Tue May 3 17:26:27 2011 Diffie-Hellman initialized with 1024 bit key
Tue May 3 17:26:27 2011 TLS-Auth MTU parms [ L:1542 D:138 EF:38 EB:0 ET:0 EL:0 ]
Tue May 3 17:26:27 2011 ROUTE default_gateway=192.168.122.1
Tue May 3 17:26:27 2011 TUN/TAP device tun0 opened
Tue May 3 17:26:27 2011 TUN/TAP TX queue length set to 100
Tue May 3 17:26:27 2011 /sbin/ip link set dev tun0 up mtu 1500
Tue May 3 17:26:27 2011 /sbin/ip addr add dev tun0 local 10.8.0.1 peer 10.8.0.2
Tue May 3 17:26:27 2011 /sbin/ip route add 10.8.0.0/24 via 10.8.0.2
Tue May 3 17:26:27 2011 Data Channel MTU parms [ L:1542 D:1450 EF:42 EB:135 ET:0 EL:0 AF:3/1 ]
Tue May 3 17:26:27 2011 Socket Buffers: R=[114688->131072] S=[114688->131072]
Tue May 3 17:26:27 2011 UDPv4 link local (bound): [undef]:1194
Tue May 3 17:26:27 2011 UDPv4 link remote: [undef]
Tue May 3 17:26:27 2011 MULTI: multi_init called, r=256 v=256
Tue May 3 17:26:27 2011 IFCONFIG POOL: base=10.8.0.4 size=62
Tue May 3 17:26:27 2011 IFCONFIG POOL LIST
Tue May 3 17:26:27 2011 Initialization Sequence Completed

But openvpn still won't start; where to go from here.
Tue May 3 17:54:25 2011 TCP/UDP: Socket bind failed on local address 192.168.122.3:1194: Address already in use
Tue May 3 17:54:25 2011 Exiting

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General :: Unable To Locate Various Man Pages On Fedora (socket ,bind,signal)?

Feb 23, 2011

I did check the manpath and the files located there.just seems that some pages are missing.

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Networking :: Implementation Of TCP/IP Applications Over SCTP?

Dec 9, 2010

Have any of the below TCP based applications are implemented over SCTP in Linux ?

1. ftp
2. telnet
3. HTTP

Or any other applications ?

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Networking :: Configuring Socket Timer To Release Socket Once The Connection Is Terminated?

Jun 4, 2010

I want to configure socket timer to release socket(port) once the connection is terminated. Do we have something in Linux OS to configure this delay to release socket?.

Any command, link or man-page anything will be helpful.

I browsed a lot but unable to find it.

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Fedora Networking :: What Is Network Protocol Sctp

Dec 12, 2010

The three lines in /etc/services for nfs (2049) has UDP, TCP and one I haven't seen before sctp. what is sctp and does iptables block it?

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Networking :: /usr/sbin/in.telnetd: Getpeername: Socket Operation On Non-socket?

May 5, 2009

I had installed Fedora 10

Below is the output of uname -a

Linux 2.6.27.5-117.fc10.i686.PAE #1 SMP Tue Nov 18 12:08:10 EST 2008 i686 i686 i386 GNU/Linux

I need to enable telnet service on it, then found xinetd and telnet-server not installed,

Then I had installed below
First I had installed Xinetd: xinetd-2.3.14-21.fc10.i386.rpm
then I had installed telnet-server: xinetd-2.3.14-21.fc10.i386.rpm

After installation I executed below commands

Service xinetd start
Chkconfig xinetd on
Chkconfig telnet on
Service iptables stop
Chkconfig iptables off
Iptables �F

After I had tried telnet localhost ----IT FAILED

when I run telnet server manually by issuing the below command
/usr/sbin/in.telnetd, I get below error
[COLOR="Red"]/usr/sbin/in.telnetd: getpeername: Socket operation on non-socket[/COLOR]

I have other system running same OS, I had followed the same steps discussed above to enable telnet, It works fine on it.

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Networking :: Creating Domain Name In Bind Exposing Bind To Internal Network

Sep 3, 2009

I am configuring bind9 on fedora 9(sulphur).I have configured /etc/named.conf and created zone file in /var/named/I have started the service but when I am executing the command nslookup mydomain.com it is not able to resolve the name.Another problem I am facing when I do telnet localhost 53,I am able to connect.but when I do telnet myip 53 it does not connect.Seems to be a firewall problem but I ve disabled iptables selinux completely even I ve disabled dnsmasq but still not working.

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Programming :: Tcp Client Socket : Get Own Port Number?

Oct 1, 2010

I am working with simple tcp client to establish connection to sockaddr_in servAddress and send data segment:

...
connect(sockfd,&servAddr,sizeof(servAddr)) < 0)
send(sockfd, pkt, pktLen, 0);
close(sockfd);
...

Elementary... Here's the tricky part: next i have to handle user level ack the server is sending to "client"... To do that i have to open server socket on the same port number the system assigned to my client socket before. How can i get it ( in user level code)?

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Ubuntu :: VLC Not Starting - Main Interface Error: Socket Bind Error (Permission Denied)

Oct 17, 2010

I tried removing it and installing again but I still get the same code in the terminal:

[Code]....

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OpenSUSE Network :: Connecting To FTP Server - Error "could Not Bind Listening IPv6 Socket"

Aug 16, 2010

I am running vsftp on one of my systems and when trying to connect to it it errors out with this: vendion@Loki:~> ftp 192.168.1.100 Connected to 192.168.1.100. 500 OOPS: could not bind listening IPv6 socket

I have tried stopping the firewall and even disabling IPv6 nothing changed, any clues as to what is going on?

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Programming :: Raw UDP Socket And ICMP Destination (Port) Unreachable?

Oct 26, 2009

I'm using a single raw socket to read UDP packets from local test network with 1024 ports. Each UDP src and dest port is unique and I need access to IP and UDP header fields. I can stream and process data (in and out) at 100 mbps in linux-rt kernel with very low jitter < 250 usec, 10 usec nominal.

I'd like to prevent kernel from issuing ICMP port unreachable errors back to the sending host, however, I don't want to create 1024 vanilla UDP sockets and bind to each one because of resource constraints. Currently, I'm using iptables to drop the outbound port unreachable messages. Does anyone know of a way (programmatic using C code) to prevent the ICMP unreachable traffic? Perhaps an IOCTL or socket option? I also tried changing /proc/sys/net/ipv4/icmp_ratelimit but that seemed to have no effect. By default the ratemask is set for dest unreachables and a variety of ratelimit values did not change any behavior that I could see.

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General :: Haproxy - "cannot Bind To Socket"

Jun 17, 2010

I am using haproxy for the first time. I downloaded the latest version 1.4.7 and then unpacked it.then opened the terminal and wrote the command $make -f Makefile.bsd REGEX=pcre DEBUG= COPTS.generic="-Os -fomit-frame-pointer -mgnu" After which an executable haproxy file was created which I copied to /usr/local/sbin.
then i wrote $sudo make install then I make a configuration file in /etc/haproxy.cfg which is as follows

[Code]....

But it's not working it is various kind of errors intially it was showing "cannot bind to socket" so tried changing the port number but didn't help I also used command like $sudo sysctl net.ipv4.ip_nonlocal_bind=1

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Ubuntu :: Failed To Create UDP Socket (SIP) On Port 5060 Address

Mar 13, 2010

I can't seem to get on my Twinkle SIP Phone, it says: "Failed to create a UDP Socket (SIP) on port 5060 Address already in use" after that message it brings me back to the window were I'm supposed to run my profile, how do I fix this?

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