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how to open up Port 21 ftp on pix 501

Posted on 2005-03-08
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Last Modified: 2007-02-13
What is the command to open up port 21 on a pix firewall ?

I am unable to post the current config, now cus im not there yet.

They have a fixed ip adress.

What the client wants to accomplish is to access a ftp server download price lists, and upload their orders to that same
ftp server.

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Question by:daxa78
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harbor235 earned 1000 total points
ID: 13486396
Are you doing NAT?  You need to add an entry to your access-list:

access-list <number> permit tcp <source_address> <netmask> <destination_ip> <netmask> eq 21
you will need port 20 as well

access-list <number> permit tcp <source_address> <netmask> <destination_ip> <netmask> eq 20


You may also need a translation from the public IP to your private(nat'd) IP:

static (inside,outside) tcp x.x.x.x 21 y.y.y.y 21 netmask 255.255.255.255 0 0

harbor235
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Assisted Solution

by:russfly
russfly earned 1000 total points
ID: 13514476
Hello,

3 assumptions here:
  xxx.xxx.xxx.0 = External IP address you want to use for ftp
  192.168.1.3 = Internal IP address of the email server that needs to receive the ftp traffic
  fixup protocol ftp 21 = is already configured on the firewall

First you would want to create an access list:
  access-list acl_out permit tcp any host xxx.xxx.xxx.0 eq ftp

Next you will need to create a static statement defining where the traffic needs to go:
  static (inside,outside) xxx.xxx.xxx.0 192.168.1.3 netmask 255.255.255.255 0 0

Finally, you want the firewall to use the access list you created which limits access to ftp:
  access-group acl_out in interface outside

Hope that helps!
Russell
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