I use forwarders for a subzone, but TCP 53 is blocked, So does forwarders really need TCP?
If forwaders use UDP, I can't get following scenario to work:
main zone is master, but subzone is forwad. Is it possible?
(On name sever itself, resolution of xx.stub.abc.com worked fine.)
Just starting to work with unix, wondering if there is any good on-line documentation explaining TCP/UDP ports, how to use them, etc...
Thanks.... (1 Reply)
Just wondering if anyone knows of any good on-line documentation on TCP/UDP Ports. Basically i want to know how to check if they are in use, learn how to close them, etc...
Thanks... (5 Replies)
i am looking to setup my own home domain name server.
i am having a problem though... "forwarders"
what are they? is that the space where i put my ISP's DNS ip addresses, or is it something else? (1 Reply)
3600 tcp/udp, trap-daemon, text relay-answer
Does anyone know what this service is responsible for, or how significant it is?
Thanks.....James (1 Reply)
Hi,
Users are connecting thru a KCML Client to UNIX machine, and I want to know which TCP/UDP port that client uses? How can I check the port of a user logged in?
Regards,
Tayyab (2 Replies)
Hello all,
I'm having a problem with DNS for external websites. I'm running OpenBSD currently, for named.
Internal sites are working perfectly, however if I try to get out to any outside website, it won't resolve. The results of nslookup are:
My named.conf file looks like this:
I've tried... (0 Replies)
May I know what is the TCP/UCP port range for any default AIX NFS? Based on rpcinfo -p, I got the following output:
program vers proto port service
100000 4 udp 111 portmapper
100000 3 udp 111 portmapper
100000 2 udp 111 portmapper
100000 4 ... (4 Replies)
How could I enable logging of bind 9 forwarders messages? I have the following but forwarded requests do not show up in the logs even when running named in debug 10 mode:
logging {
channel syslog_errors { // this channel will send errors or
... (0 Replies)
Hey Guy's,
Is there a limit on the number of forwards that can be used or the syntax and spaces?
I noticed I have to put spaces between ; and the IP for at least the first one, then space at the end to work and the rest don't work at all no matter what I try.
forward first;
... (1 Reply)
Discussion started by: Devyn
1 Replies
LEARN ABOUT BSD
udp
UDP(4P)UDP(4P)NAME
udp - Internet User Datagram Protocol
SYNOPSIS
#include <sys/socket.h>
#include <netinet/in.h>
s = socket(AF_INET, SOCK_DGRAM, 0);
DESCRIPTION
UDP is a simple, unreliable datagram protocol which is used to support the SOCK_DGRAM abstraction for the Internet protocol family. UDP
sockets are connectionless, and are normally used with the sendto and recvfrom calls, though the connect(2) call may also be used to fix
the destination for future packets (in which case the recv(2) or read(2) and send(2) or write(2) system calls may be used).
UDP address formats are identical to those used by TCP. In particular UDP provides a port identifier in addition to the normal Internet
address format. Note that the UDP port space is separate from the TCP port space (i.e. a UDP port may not be "connected" to a TCP port).
In addition broadcast packets may be sent (assuming the underlying network supports this) by using a reserved "broadcast address"; this
address is network interface dependent.
Options at the IP transport level may be used with UDP; see ip(4P).
DIAGNOSTICS
A socket operation may fail with one of the following errors returned:
[EISCONN] when trying to establish a connection on a socket which already has one, or when trying to send a datagram with the destina-
tion address specified and the socket is already connected;
[ENOTCONN] when trying to send a datagram, but no destination address is specified, and the socket hasn't been connected;
[ENOBUFS] when the system runs out of memory for an internal data structure;
[EADDRINUSE] when an attempt is made to create a socket with a port which has already been allocated;
[EADDRNOTAVAIL]
when an attempt is made to create a socket with a network address for which no network interface exists.
SEE ALSO getsockopt(2), recv(2), send(2), socket(2), intro(4N), inet(4F), ip(4P)4.2 Berkeley Distribution May 16, 1986 UDP(4P)