Dell Command Line Reference Guide for the S4048–ON System 9.14.2.4

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seq (for IPv6 ACLs)

Assign a sequence number to a deny or permit the filter in an IPv6 access list while creating the filter.

Syntax
seq sequence-number {deny | permit} {ipv6-protocol-number | icmp | ip | tcp | udp} {source address mask | any | host ipv6-address} {destination address | any | host ipv6-address} [operator port [portnumber ]] [count [byte]] [log [interval minutes] [threshold-in-msgs [count]] [monitor]

To delete a filter, use the no seq sequence-number command.

Parameters
sequence-number
Enter a number from 0 to 4294967290.
deny
Enter the keyword deny to configure a filter to drop packets meeting this condition.
permit
Enter the keyword permit to configure a filter to forward packets meeting this criteria.
ipv6-protocol-number
Enter a number to filter based on the protocol identified in the IPv6 protocol header.
icmp
Enter the keyword icmp to configure an ICMP access list filter.
ip
Enter the keyword ip to configure a generic IP access list. The keyword ip specifies that the access list permits all IP protocols.
tcp
Enter the keyword tcp to configure a TCP access list filter.
udp
Enter the keyword udp to configure a UDP access list filter.
source
Enter an IP address in dotted decimal format of the network from which the packet was received.
mask
(OPTIONAL) 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 and then enter the IPv6 address to specify a host IP address or hostname.
operator
(OPTIONAL) Enter one of the following logical operands:
  • eq = equal to
  • neq = not equal to
  • gt = greater than
  • lt = less than
  • range = inclusive range of ports (you must specify two ports for the port parameter.)
portnumber
(OPTIONAL) Enter the application layer port number. Enter two port numbers if you are using the range logical operand. The range is from 0 to 65535.
The following list includes some common TCP port numbers:
  • 23 = Telnet
  • 20 and 21 = FTP-DATA and FTP
  • 25 = SMTP
  • 169 = SNMP
destination
Enter the IP address of the network or host to which the packets are sent.
count
(OPTIONAL) Enter the keyword count to count the packets.
bytes
(OPTIONAL) Enter the keyword bytes to count the bytes.
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 terminate with the seq, permit, or deny commands. The threshold range is from 1 to 100.
interval minutes
(OPTIONAL) Enter the keyword interval followed by the time period in minutes at which ACL logs must be generated. The interval range is from 1 to 10 minutes.
monitor
(OPTIONAL) Enter the keyword monitor when the rule is describing the traffic that you want to monitor and the ACL in which you are creating the rule is applied to the monitored interface.
Defaults

By default, 10 ACL logs are generated if you do not specify the threshold explicitly.

The default frequency at which ACL logs are generated is five minutes. By default, flow-based monitoring is not enabled.

Command Modes
ACCESS-LIST
Command History

This guide is platform-specific. For command information about other platforms, see the relevant Dell EMC Networking OS Command Line Reference Guide.

Version
Description
9.11(2.0P0)
Included support for using logical names of a protocol to configure an IP access list in both TCP and UDP on the S6000, S6000–ON, S6100–ON, Z9100–ON.
9.10(0.1)
Introduced on the S6010-ON and S4048T-ON.
9.10(0.0)
Introduced on the S3148.
9.10(0.0)
Introduced on the S6100.
9.8(1.0)
Introduced on the Z9100–ON.
9.7(0.0)
Introduced on the S6000–ON.
9.5(0.1)
Introduced on the Z9500.
9.4(0.0)
Added support for flow-based monitoring on the S4810, S4820T, S6000, and Z9000 platforms.
9.3(0.0)
Added support for logging of ACLs on the S4810, S4820T, and Z9000 platforms.
Usage Information

When the configured maximum threshold is exceeded, generation of logs is stopped. When the interval at which ACL logs are configured to be recorded expires, the subsequent, fresh interval timer is started and the packet count for that new interval commences from zero. If ACL logging was stopped previously because the configured threshold is exceeded, it is re-enabled for this new interval.

If ACL logging is stopped because the configured threshold is exceeded, it is re-enabled after the logging interval period elapses. ACL logging is supported for standard and extended IPv4 ACLs, IPv6 ACLs, and MAC ACLs. You can configure ACL logging only on ACLs that are applied to ingress interfaces; you cannot enable logging for ACLs that are associated with egress interfaces.

You can activate flow-based monitoring for a monitoring session by entering the flow-based enable command in the Monitor Session mode. When you enable this capability, traffic with particular flows that are traversing through the ingress and egress interfaces are examined and, appropriate ACLs can be applied in both the ingress and egress direction. Flow-based monitoring conserves bandwidth by monitoring only specified traffic instead all traffic on the interface. This feature is particularly useful when looking for malicious traffic. It is available for Layer 2 and Layer 3 ingress and egress traffic. You may specify traffic using standard or extended access-lists. This mechanism copies all incoming or outgoing packets on one port and forwards (mirrors) them to another port. The source port is the monitored port (MD) and the destination port is the monitoring port (MG).

Related Commands
  • permit – configure a filter to forward packets.

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