permit icmp
To allow all or specific internet control message protocol (ICMP) messages, configure a filter.
Syntax
permit icmp {
source address mask
| any | host
ipv6-address
}
{
destination address
| any | host
ipv6-address
} [
message-type
]
[count [byte]] | [log] [interval minutes] [threshold-in-msgs
[
count
]][monitor]
To remove this filter, you have two choices:
• Use the
no seq sequence-number
command if you know the filter’s
sequence number.
• Use the
no permit icmp {
source address mask
| any | host
ipv6-
address
} {
destination address
| any | host
ipv6-address
}
command.
Parameters
source address
Enter the IPv6 address of the network or host from which the
packets were sent in the x:x:x:x::x format then the prefix
length in the /x format. The range is from /0 to /128. The ::
notation specifies successive hexadecimal fields of zero.
mask
Enter a network mask in /prefix format (/x).
any
Enter the keyword
any
to specify that all routes are subject
to the filter.
host
ipv6-
address
Enter the keyword
host
then the IPv6 address of the host in
the x:x:x:x::x format. The :: notation specifies successive
hexadecimal fields of zero.
destination
address
Enter the IPv6 address of the network or host to which the
packets are sent in the x:x:x:x::x format then the prefix length
in the /x format. The range is from /0 to /128. The :: notation
specifies successive hexadecimal fields of zero.
message-type
(OPTIONAL) Enter an ICMP message type, either with the
type (and code, if necessary) numbers or with the name of
the message type. The range is from 0 to 255 for ICMP type
and from 0 to 255 for ICMP code.
count
(OPTIONAL) Enter the keyword
count
to count packets the
filter processes.
byte
(OPTIONAL) Enter the keyword
byte
to count bytes the filter
processes.
log
(OPTIONAL) Enter the keyword
log
to enable the triggering
of ACL log messages.
threshold-in-
msgs
count
(OPTIONAL) Enter the
threshold-in-msgs
keyword
followed by a value to indicate the maximum number of ACL
logs that can be generated, exceeding which the generation
of ACL logs is terminated with the
seq
,
permit
, or
deny
commands. The threshold range is from 1 to 100.
274
Access Control Lists (ACL)
