Administrator Guide

Configure an Extended IP ACL
Extended IP ACLs filter on source and destination IP addresses, IP host addresses, TCP addresses, TCP host addresses, UDP
addresses, and UDP host addresses.
The traffic passes through the filter in the order of the filter’s sequence and hence you can configure the extended IP ACL by
first entering IP ACCESS LIST mode, and then assigning a sequence number to the filter.
Configuring Filters with a Sequence Number
To configure filters with a sequence number, use the following commands.
1. Enter IP ACCESS LIST mode by creating an extended IP ACL.
CONFIGURATION mode
ip access-list extended access-list-name
2. Configure a drop or forward filter.
CONFIG-EXT-NACL mode
seq sequence-number {deny | permit} {ip-protocol-number | icmp | ip | tcp | udp} {source
mask | any | host ip-address} {destination mask | any | host ip-address} [operator
[portnumber | portname]] [count [byte]] [order] [monitor [session-id]] [fragments]
While configuring an IP access list, you can choose to configure either by using the logical name of the protocol or by using
the port number of the protocol. The logical names are available for both TCP and UDP.
When you use the log keyword, the CP logs details about the packets that match. Depending on how many packets match the
log entry and at what rate, the CP may become busy as it has to log these packets’ details.
Example for configuring the IP access list using port numbers and protocol names:
DellEMC(config-ext-nacl)# seq 25 permit tcp any eq 40 any eq 33
DellEMC(config-ext-nacl)# seq 30 permit tcp any eq 33 any eq 43
DellEMC(config-ext-nacl)# seq 35 permit tcp any range www 194 any eq 101
DellEMC(config-ext-nacl)# seq 40 permit udp any eq 434 any gt mobile-ip
DellEMC(config-ext-nacl)# seq 45 deny udp any eq 53 any lt ntp
DellEMC(config-ext-nacl)#
DellEMC(config-ext-nacl)#show config
!
ip access-list extended vv
seq 25 permit tcp any eq 40 any eq 33
seq 30 permit tcp any eq 33 any eq 43
seq 35 permit tcp any range www 194 any eq 101
seq 40 permit udp any eq 434 any gt mobile-ip
seq 45 deny udp any eq 53 any lt ntp
Configure Filters, ICMP Packets
To create a filter for ICMP packets with a specified sequence number, use the following commands.
1. Create either an extended IPv4 or IPv6 ACL and assign it a unique name.
CONFIGURATION mode
ip access-list extended access-list-name
ipv6 access-list extended access-list-name
2. Configure an extended IP ACL filter for ICMP packets.
CONFIG-EXT-NACL mode
seq sequence-number {deny | permit} icmp {source mask | any | host ip-address} [count
[byte]] [order] [monitor [session-id]] [fragments]
The ICMP packets cannot be filtered using mirroring ACL.
The following example shows the configuration to filter ICMP packets using IPv4 ACL:
DellEMC(config-ext-nacl)#show config
!
Access Control Lists (ACLs)
123