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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 19:41:07 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 19:41:07 +0000
commit3af6d22bb3850ab2bac67287e3a3d3b0e32868e5 (patch)
tree3ee7a3ec64525911fa865bb984c86d997d855527 /man7/icmp.7
parentAdding debian version 6.05.01-1. (diff)
downloadmanpages-3af6d22bb3850ab2bac67287e3a3d3b0e32868e5.tar.xz
manpages-3af6d22bb3850ab2bac67287e3a3d3b0e32868e5.zip
Merging upstream version 6.7.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man7/icmp.7')
-rw-r--r--man7/icmp.720
1 files changed, 10 insertions, 10 deletions
diff --git a/man7/icmp.7 b/man7/icmp.7
index cd54614..3969fe2 100644
--- a/man7/icmp.7
+++ b/man7/icmp.7
@@ -5,7 +5,7 @@
.\"
.\" $Id: icmp.7,v 1.6 2000/08/14 08:03:45 ak Exp $
.\"
-.TH icmp 7 2023-07-15 "Linux man-pages 6.05.01"
+.TH icmp 7 2023-10-31 "Linux man-pages 6.7"
.SH NAME
icmp \- Linux IPv4 ICMP kernel module.
.SH DESCRIPTION
@@ -16,7 +16,7 @@ The user doesn't interact directly with this module;
instead it communicates with the other protocols in the kernel
and these pass the ICMP errors to the application layers.
The kernel ICMP module also answers ICMP requests.
-.PP
+.P
A user protocol may receive ICMP packets for all local sockets by opening
a raw socket with the protocol
.BR IPPROTO_ICMP .
@@ -28,7 +28,7 @@ The types of ICMP packets passed to the socket can be filtered using the
socket option.
ICMP packets are always processed by the kernel too, even
when passed to a user socket.
-.PP
+.P
Linux limits the rate of ICMP error packets to each destination.
.B ICMP_REDIRECT
and
@@ -143,7 +143,7 @@ H Address Mask Request
I Address Mask Reply
.TE
.RE
-.PP
+.P
The bits marked with an asterisk are rate limited by default
(see the default mask above).
.TP
@@ -163,7 +163,7 @@ means no group is allowed to create ICMP Echo sockets.
Support for the
.B ICMP_ADDRESS
request was removed in Linux 2.2.
-.PP
+.P
Support for
.B ICMP_SOURCE_QUENCH
was removed in Linux 2.2.
@@ -173,18 +173,18 @@ As many other implementations don't support
raw sockets, this feature
should not be relied on in portable programs.
.\" not really true ATM
-.\" .PP
+.\" .P
.\" Linux ICMP should be compliant to RFC 1122.
-.PP
+.P
.B ICMP_REDIRECT
packets are not sent when Linux is not acting as a router.
They are also accepted only from the old gateway defined in the
routing table and the redirect routes are expired after some time.
-.PP
+.P
The 64-bit timestamp returned by
.B ICMP_TIMESTAMP
is in milliseconds since the Epoch, 1970-01-01 00:00:00 +0000 (UTC).
-.PP
+.P
Linux ICMP internally uses a raw socket to send ICMPs.
This raw socket may appear in
.BR netstat (8)
@@ -192,5 +192,5 @@ output with a zero inode.
.SH SEE ALSO
.BR ip (7),
.BR rdisc (8)
-.PP
+.P
RFC\ 792 for a description of the ICMP protocol.