diff options
Diffstat (limited to 'share/man/man4/ip.4')
| -rw-r--r-- | share/man/man4/ip.4 | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/share/man/man4/ip.4 b/share/man/man4/ip.4 index 6945475..72d0490 100644 --- a/share/man/man4/ip.4 +++ b/share/man/man4/ip.4 @@ -32,7 +32,7 @@ .\" @(#)ip.4 8.2 (Berkeley) 11/30/93 .\" $FreeBSD$ .\" -.Dd February 13, 2009 +.Dd March 9, 2009 .Dt IP 4 .Os .Sh NAME @@ -466,13 +466,19 @@ setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); .Pp This option improves performance for applications that may have no more than one -instance on a single host (such as a router daemon), by eliminating +instance on a single host (such as a routing daemon), by eliminating the overhead of receiving their own transmissions. It should generally not be used by applications for which there may be more than one instance on a single host (such as a conferencing program) or for which the sender does not belong to the destination group (such as a time querying program). .Pp +The sysctl setting +.Va net.inet.ip.mcast.loop +controls the default setting of the +.Dv IP_MULTICAST_LOOP +socket option for new sockets. +.Pp A multicast datagram sent with an initial TTL greater than 1 may be delivered to the sending host on a different interface from that on which it was sent, if the host belongs to the destination group on that other interface. @@ -650,6 +656,13 @@ documented in RFC 3678. For management of source filter lists using this API, please refer to .Xr sourcefilter 3 . +.Pp +The sysctl settings +.Va net.inet.ip.mcast.maxsocksrc +and +.Va net.inet.ip.mcast.maxgrpsrc +are used to specify an upper limit on the number of per-socket and per-group +source filter entries which the kernel may allocate. .\"----------------------- .Ss "Raw IP Sockets" .Pp @@ -795,6 +808,7 @@ field was not equal to the length of the datagram written to the socket. .Xr send 2 , .Xr byteorder 3 , .Xr icmp 4 , +.Xr igmp 4 , .Xr inet 4 , .Xr intro 4 , .Xr multicast 4 , |
