07-28-2009
Binding the same port number on different interfaces
Hi,
We can use the same port number for two applications based on protocols.(i.e one application is based on TCP and the other application based on UDP).
But i don't know about interfaces, can anyone one help........
1) Can we use same port number for different applications on a single interface.
2) Can we use same port number for different applications on different interfaces(interfaces have separate ip address).
Consider that same port number can be used on different applications, then won,t it be a problem in receiving the packets.
Applications using UDP protocol.
--------------------------------
1) Application 1 is binded to the port number 1500 and ip address of an interface.(Transfer the packet through the selected interface).
2) Application 2 is binded to the port number 1500 and ip address is 0.0.0.0
Now, inorder to transfer the packet of Application 2 an interface has to be selected based on destination's ip address.
If application 2 want's to transfer packets with different destination ip adresses, then different interfaces will be selected for different interfaces.(so application 2 may transfer packet through any one of the available interface and where as application 1 will transfer through the specific interface).
--->After receiving the packet, how should i select the socket of application 1 and application 2.
Problem is both sockets are binded to same port number and interface on which application 2 is transferring the packets are not fixed.
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FAITH(4) BSD Kernel Interfaces Manual FAITH(4)
NAME
faith -- IPv6-to-IPv4 TCP relay capturing interface
SYNOPSIS
pseudo-device faith
DESCRIPTION
The faith interface captures IPv6 TCP traffic, for implementing userland IPv6-to-IPv4 TCP relay like faithd(8).
faith interfaces are dynamically created and destroyed with the ifconfig(8) create and destroy subcommands.
Special action will be taken when IPv6 TCP traffic is seen on a router, and the routing table suggests to route it to the faith interface.
In this case, the packet will be accepted by the router, regardless of the list of IPv6 interface addresses assigned to the router. The
packet will be captured by an IPv6 TCP socket, if it has the IN6P_FAITH flag turned on and matching address/port pairs. As a result, faith
will let you capture IPv6 TCP traffic to some specific destination addresses. Userland programs, such as faithd(8) can use this behavior to
relay IPv6 TCP traffic to IPv4 TCP traffic. The program can accept some specific IPv6 TCP traffic, perform getsockname(2) to get the IPv6
destination address specified by the client, and perform application-specific address mapping to relay IPv6 TCP to IPv4 TCP.
IN6P_FAITH flag on an IPv6 TCP socket can be set by using setsockopt(2), with level IPPROTO_IPV6 and optname IPv6_FAITH.
To handle error reports by ICMPv6, some ICMPv6 packets routed to an faith interface will be delivered to IPv6 TCP, as well.
To understand how faith can be used, take a look at the source code of faithd(8).
As the faith interface implements potentially dangerous operations, great care must be taken when configuring it. To avoid possible misuse,
the sysctl(8) variable net.inet6.ip6.keepfaith must be set to 1 prior to using the interface. When net.inet6.ip6.keepfaith is 0, no packets
will be captured by the faith interface.
The faith interface is intended to be used on routers, not on hosts.
SEE ALSO
inet(4), inet6(4), faithd(8)
Jun-ichiro itojun Hagino and Kazu Yamamoto, "An IPv6-to-IPv4 transport relay translator", RFC 3142, ftp://ftp.isi.edu/in-notes/rfc3142.txt,
June 2001.
HISTORY
The FAITH IPv6-to-IPv4 TCP relay translator first appeared in the WIDE hydrangea IPv6 stack.
BSD
January 9, 2010 BSD