What is the IP address of my local interface that is required by IP_ADD_MEMBERSHIP?
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In this man page http://man7.org/linux/man-pages/man7/ip.7.html, it is written that IP_ADD_MEMBERSHIP can be used to join a multicast group. We need to provide, as input, in particular, the IP multicast group address and the IP address of the local interface.
But what is a local interface exactly? What would be an IP address of a local interface?
Is it the address like 127.0.0.1? I know this often called the "localhost" or "loopback" interface. But I am not sure what why it's called "interface", anyway (what is a local interface?). Isn't 127.0.0.1 just the IP address that points to my own computer?
Is the IP address of my local interface the address of my computer on my local area network (LAN): for example, given that I am on a Mac OS X, the "inet" address under
en0(that can be retrieved using the commandifconfig)?
How is this IP address of the local interface different from the address of the multicast group?
Local interface implies the existence of global interface, I guess. So, what would be a "global interface"?
So, which address corresponds to the IP address of my local interface that I should pass to
IP_ADD_MEMBERSHIP?
osx c socket api
edited Dec 2 at 14:57
Rui F Ribeiro
38.5k1479128
asked Dec 2 at 11:47
nbro
2221513
add a comment |
up vote
0
down vote
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In this man page http://man7.org/linux/man-pages/man7/ip.7.html, it is written that IP_ADD_MEMBERSHIP can be used to join a multicast group. We need to provide, as input, in particular, the IP multicast group address and the IP address of the local interface.
But what is a local interface exactly? What would be an IP address of a local interface?
Is it the address like 127.0.0.1? I know this often called the "localhost" or "loopback" interface. But I am not sure what why it's called "interface", anyway (what is a local interface?). Isn't 127.0.0.1 just the IP address that points to my own computer?
Is the IP address of my local interface the address of my computer on my local area network (LAN): for example, given that I am on a Mac OS X, the "inet" address under
en0(that can be retrieved using the commandifconfig)?
How is this IP address of the local interface different from the address of the multicast group?
Local interface implies the existence of global interface, I guess. So, what would be a "global interface"?
So, which address corresponds to the IP address of my local interface that I should pass to
IP_ADD_MEMBERSHIP?
osx c socket api
edited Dec 2 at 14:57
Rui F Ribeiro
38.5k1479128
asked Dec 2 at 11:47
nbro
2221513
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
In this man page http://man7.org/linux/man-pages/man7/ip.7.html, it is written that IP_ADD_MEMBERSHIP can be used to join a multicast group. We need to provide, as input, in particular, the IP multicast group address and the IP address of the local interface.
But what is a local interface exactly? What would be an IP address of a local interface?
Is it the address like 127.0.0.1? I know this often called the "localhost" or "loopback" interface. But I am not sure what why it's called "interface", anyway (what is a local interface?). Isn't 127.0.0.1 just the IP address that points to my own computer?
Is the IP address of my local interface the address of my computer on my local area network (LAN): for example, given that I am on a Mac OS X, the "inet" address under
en0(that can be retrieved using the commandifconfig)?
How is this IP address of the local interface different from the address of the multicast group?
Local interface implies the existence of global interface, I guess. So, what would be a "global interface"?
So, which address corresponds to the IP address of my local interface that I should pass to
IP_ADD_MEMBERSHIP?
osx c socket api
edited Dec 2 at 14:57
Rui F Ribeiro
38.5k1479128
asked Dec 2 at 11:47
nbro
2221513
In this man page http://man7.org/linux/man-pages/man7/ip.7.html, it is written that IP_ADD_MEMBERSHIP can be used to join a multicast group. We need to provide, as input, in particular, the IP multicast group address and the IP address of the local interface.
But what is a local interface exactly? What would be an IP address of a local interface?
Is it the address like 127.0.0.1? I know this often called the "localhost" or "loopback" interface. But I am not sure what why it's called "interface", anyway (what is a local interface?). Isn't 127.0.0.1 just the IP address that points to my own computer?
Is the IP address of my local interface the address of my computer on my local area network (LAN): for example, given that I am on a Mac OS X, the "inet" address under
en0(that can be retrieved using the commandifconfig)?
How is this IP address of the local interface different from the address of the multicast group?
Local interface implies the existence of global interface, I guess. So, what would be a "global interface"?
So, which address corresponds to the IP address of my local interface that I should pass to
IP_ADD_MEMBERSHIP?
osx c socket api
osx c socket api
edited Dec 2 at 14:57
Rui F Ribeiro
38.5k1479128
asked Dec 2 at 11:47
nbro
2221513
edited Dec 2 at 14:57
Rui F Ribeiro
38.5k1479128
asked Dec 2 at 11:47
nbro
2221513
edited Dec 2 at 14:57
Rui F Ribeiro
38.5k1479128
edited Dec 2 at 14:57
Rui F Ribeiro
38.5k1479128
edited Dec 2 at 14:57
Rui F Ribeiro
38.5k1479128
38.5k1479128
asked Dec 2 at 11:47
nbro
2221513
asked Dec 2 at 11:47
nbro
2221513
asked Dec 2 at 11:47
nbro
2221513
2221513
add a comment |
add a comment |
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