Configuring Filters Without A Sequence Number - Dell Force10 Z9000 Configuration Manual

seq sequence-number {deny | permit} tcp {source mask | any | host ip-address}} [count
[byte]] [order] [fragments]
Configure Filters, TCP Packets
To create a filter for UDP packets with a specified sequence number, use the following commands.
1. Create an extended IP ACL and assign it a unique name.
CONFIGURATION mode
ip access-list extended access-list-name
2. Configure an extended IP ACL filter for UDP packets.
CONFIG-EXT-NACL mode
seq sequence-number {deny | permit} tcp {source mask | any | host ip-address}} [count
[byte]] [order] [fragments]
Example of the seq Command
When you create the filters with a specific sequence number, you can create the filters in any order and the filters are placed in the
correct order.
NOTE: When assigning sequence numbers to filters, you may have to insert a new filter. To prevent reconfiguring multiple
filters, assign sequence numbers in multiples of five or another number.
The example below shows how the seq command orders the filters according to the sequence number assigned. In the example,
filter 15 was configured before filter 5, but the show config command displays the filters in the correct order.
Dell(config-ext-nacl)#seq 15 deny ip host 112.45.0.0 any log
Dell(config-ext-nacl)#seq 5 permit tcp 12.1.3.45 0.0.255.255 any
Dell(config-ext-nacl)#show confi
!
ip access-list extended dilling
seq 5 permit tcp 12.1.0.0 0.0.255.255 any
seq 15 deny ip host 112.45.0.0 any log
Dell(config-ext-nacl)#

Configuring Filters Without a Sequence Number

If you are creating an extended ACL with only one or two filters, you can let Dell Networking OS assign a sequence number based on
the order in which the filters are configured. Dell Networking OS assigns filters in multiples of five.
To configure a filter for an extended IP ACL without a specified sequence number, use any or all of the following commands:
• Configure a deny or permit filter to examine IP packets.
CONFIG-EXT-NACL mode
{deny | permit} {source mask | any | host ip-address} [count [byte]] [order] [fragments]
• Configure a deny or permit filter to examine TCP packets.
CONFIG-EXT-NACL mode
{deny | permit} tcp {source mask] | any | host ip-address}} [count [byte]] [order]
[fragments]
• Configure a deny or permit filter to examine UDP packets.
CONFIG-EXT-NACL mode
{deny | permit} udp {source mask | any | host ip-address}} [count [byte]] [order]
[fragments]
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.
92
Access Control Lists (ACLs)