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Dell EMC Networking OS Configuration Guide for the S5048F–ON System 9.14.2.8

Configure Filters, UDP 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] [monitor [session-id]] [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.

DellEMC(config-ext-nacl)#seq 15 deny ip host 112.45.0.0 any log monitor 501
DellEMC(config-ext-nacl)#seq 5 permit tcp 12.1.3.45 0.0.255.255 any
DellEMC(config-ext-nacl)#show config
!
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 monitor 501
DellEMC(config-ext-nacl)#

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