diff options
Diffstat (limited to 'sbin/ping/ping.8')
-rw-r--r-- | sbin/ping/ping.8 | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/sbin/ping/ping.8 b/sbin/ping/ping.8 index 8ec5bc1..0b8f673 100644 --- a/sbin/ping/ping.8 +++ b/sbin/ping/ping.8 @@ -30,7 +30,7 @@ .\" SUCH DAMAGE. .\" .\" @(#)ping.8 8.2 (Berkeley) 12/11/93 -.\" $Id$ +.\" $Id: ping.8,v 1.3 1996/10/05 22:27:04 wosch Exp $ .\" .Dd December 11, 1993 .Dt PING 8 @@ -42,12 +42,15 @@ packets to network hosts .Sh SYNOPSIS .Nm ping -.Op Fl dfnqrvRQ +.Op Fl dfnqrvLRQ .Op Fl c Ar count .Op Fl i Ar wait +.Op Fl I Ar interface .Op Fl l Ar preload .Op Fl p Ar pattern .Op Fl s Ar packetsize +.Op Fl T Ar ttl +.Ar host .Sh DESCRIPTION .Nm Ping uses the @@ -99,6 +102,9 @@ The default is to wait for one second between each packet. This option is incompatible with the .Fl f option. +.It Fl I Ar interface +Source multicast packets with the given interface address. +This flag only applies if the ping destination is a multicast address. .It Fl l Ar preload If .Ar preload @@ -106,6 +112,9 @@ is specified, .Nm ping sends that many packets as fast as possible before falling into its normal mode of behavior. +.It Fl L +Suppress loopback of multicast packets. +This flag only applies if the ping destination is a multicast address. .It Fl n Numeric output only. No attempt will be made to lookup symbolic names for host addresses. @@ -159,6 +168,9 @@ data bytes when combined with the 8 bytes of .Tn ICMP header data. +.It Fl T Ar ttl +Set the IP Time To Live for multicasted packets. +This flag only applies if the ping destination is a multicast address. .It Fl v Verbose output. .Tn ICMP @@ -216,11 +228,15 @@ given. .Sh DUPLICATE AND DAMAGED PACKETS .Nm Ping will report duplicate and damaged packets. -Duplicate packets should never occur, and seem to be caused by +Duplicate packets should never occur when pinging a unicast address, +and seem to be caused by inappropriate link-level retransmissions. Duplicates may occur in many situations and are rarely (if ever) a good sign, although the presence of low levels of duplicates may not always be cause for alarm. +Duplicates are expected when pinging a broadcast or multicast address, +since they are not really duplicates but replies from different hosts +to the same request. .Pp Damaged packets are obviously serious cause for alarm and often indicate broken hardware somewhere in the |