| ip.4 (108ad5bd51bf0c2f8ce08a0c1126918984cbf08d) | ip.4 (d10910e6cee0dca8be3d5a7fdbe404a15d9e7b52) |
|---|---|
| 1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 18 unchanged lines hidden (view full) --- 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)ip.4 8.2 (Berkeley) 11/30/93 33.\" $FreeBSD$ 34.\" | 1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 18 unchanged lines hidden (view full) --- 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)ip.4 8.2 (Berkeley) 11/30/93 33.\" $FreeBSD$ 34.\" |
| 35.Dd February 13, 2009 | 35.Dd March 9, 2009 |
| 36.Dt IP 4 37.Os 38.Sh NAME 39.Nm ip 40.Nd Internet Protocol 41.Sh SYNOPSIS 42.In sys/types.h 43.In sys/socket.h --- 417 unchanged lines hidden (view full) --- 461over whether or not subsequent datagrams are looped back: 462.Bd -literal 463u_char loop; /* 0 = disable, 1 = enable (default) */ 464setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); 465.Ed 466.Pp 467This option 468improves performance for applications that may have no more than one | 36.Dt IP 4 37.Os 38.Sh NAME 39.Nm ip 40.Nd Internet Protocol 41.Sh SYNOPSIS 42.In sys/types.h 43.In sys/socket.h --- 417 unchanged lines hidden (view full) --- 461over whether or not subsequent datagrams are looped back: 462.Bd -literal 463u_char loop; /* 0 = disable, 1 = enable (default) */ 464setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); 465.Ed 466.Pp 467This option 468improves performance for applications that may have no more than one |
| 469instance on a single host (such as a router daemon), by eliminating | 469instance on a single host (such as a routing daemon), by eliminating |
| 470the overhead of receiving their own transmissions. 471It should generally not 472be used by applications for which there may be more than one instance on a 473single host (such as a conferencing program) or for which the sender does 474not belong to the destination group (such as a time querying program). 475.Pp | 470the overhead of receiving their own transmissions. 471It should generally not 472be used by applications for which there may be more than one instance on a 473single host (such as a conferencing program) or for which the sender does 474not belong to the destination group (such as a time querying program). 475.Pp |
| 476The sysctl setting 477.Va net.inet.ip.mcast.loop 478controls the default setting of the 479.Dv IP_MULTICAST_LOOP 480socket option for new sockets. 481.Pp |
|
| 476A multicast datagram sent with an initial TTL greater than 1 may be delivered 477to the sending host on a different interface from that on which it was sent, 478if the host belongs to the destination group on that other interface. 479The loopback control option has no effect on such delivery. 480.Pp 481A host must become a member of a multicast group before it can receive 482datagrams sent to the group. 483To join a multicast group, use the --- 161 unchanged lines hidden (view full) --- 645for exclusive-mode group memberships. 646However, both exclusive and inclusive mode memberships 647support the use of the 648.Em full-state API 649documented in RFC 3678. 650For management of source filter lists using this API, 651please refer to 652.Xr sourcefilter 3 . | 482A multicast datagram sent with an initial TTL greater than 1 may be delivered 483to the sending host on a different interface from that on which it was sent, 484if the host belongs to the destination group on that other interface. 485The loopback control option has no effect on such delivery. 486.Pp 487A host must become a member of a multicast group before it can receive 488datagrams sent to the group. 489To join a multicast group, use the --- 161 unchanged lines hidden (view full) --- 651for exclusive-mode group memberships. 652However, both exclusive and inclusive mode memberships 653support the use of the 654.Em full-state API 655documented in RFC 3678. 656For management of source filter lists using this API, 657please refer to 658.Xr sourcefilter 3 . |
| 659.Pp 660The sysctl settings 661.Va net.inet.ip.mcast.maxsocksrc 662and 663.Va net.inet.ip.mcast.maxgrpsrc 664are used to specify an upper limit on the number of per-socket and per-group 665source filter entries which the kernel may allocate. |
|
| 653.\"----------------------- 654.Ss "Raw IP Sockets" 655.Pp 656Raw 657.Tn IP 658sockets are connectionless, 659and are normally used with the 660.Xr sendto 2 --- 129 unchanged lines hidden (view full) --- 790field was not equal to the length of the datagram written to the socket. 791.El 792.Sh SEE ALSO 793.Xr getsockopt 2 , 794.Xr recv 2 , 795.Xr send 2 , 796.Xr byteorder 3 , 797.Xr icmp 4 , | 666.\"----------------------- 667.Ss "Raw IP Sockets" 668.Pp 669Raw 670.Tn IP 671sockets are connectionless, 672and are normally used with the 673.Xr sendto 2 --- 129 unchanged lines hidden (view full) --- 803field was not equal to the length of the datagram written to the socket. 804.El 805.Sh SEE ALSO 806.Xr getsockopt 2 , 807.Xr recv 2 , 808.Xr send 2 , 809.Xr byteorder 3 , 810.Xr icmp 4 , |
| 811.Xr igmp 4 , |
|
| 798.Xr inet 4 , 799.Xr intro 4 , 800.Xr multicast 4 , 801.Xr sourcefilter 3 802.Rs 803.%A D. Thaler 804.%A B. Fenner 805.%A B. Quinn --- 13 unchanged lines hidden --- | 812.Xr inet 4 , 813.Xr intro 4 , 814.Xr multicast 4 , 815.Xr sourcefilter 3 816.Rs 817.%A D. Thaler 818.%A B. Fenner 819.%A B. Quinn --- 13 unchanged lines hidden --- |