Solved

Cisco asa 5505 ACL for tftp server

Posted on 2016-11-22
4
34 Views
Last Modified: 2016-12-02
I'm trying to setup a tftp acl on my asa5505. IOS 8.4.7
Internally it works fine.  Externally, not. If I try to do a copy running-config tftp, for instance, from an external ASA, the local tftp server software sees and creates an empty file on the tftp directory so it's getting through.  Then deletes it, tries and repeats 5 more times before showing timeout error. I don't run tftp except when I'm updating something so it's on the outside interface and not a DMZ.  

Code is below.

object network Open-TFTP
 host 192.168.8.99
access-list OutToInTFTP extended permit udp any host 192.168.8.99 eq tftp
object network Open-TFTP
 nat (inside,outside) static interface service udp tftp tftp
access-group OutToInTFTP in interface outside
policy-map global_policy
 class inspection_default
 inspect tftp

Please advise what silly basic item I am overlooking?
0
Comment
Question by:davebird
  • 2
4 Comments
 
LVL 37

Expert Comment

by:ArneLovius
ID: 41899200
The rule looks fine, but it is in isolation, so there may be something else causing the issue.

I would not run tftp over the internet, its a plain text protocol. I run rancid http://www.shrubbery.net/rancid/ to automatically collect configs, put them into source control and show me diffs between configs.
0
 
LVL 57

Expert Comment

by:Pete Long
ID: 41899328
Agreed, I have a firewall (5510) that I have in my DC that I TFTP to its setup the same as this and it works?
I use 3CDeamon

Here's the config lifted from working firewall

access-list inbound extended permit udp any object Internal_TFTP_Server eq tftp
access-group inbound in interface outside
!
object network Internal_TFTP_Server
 host 192.168.100.10
 nat (inside,outside) static interface service udp tftp tftp
!
policy-map global_policy
 class inspection_default
  inspect tftp
!


Pete
0
 

Accepted Solution

by:
davebird earned 0 total points
ID: 41903414
There is/was something on the rights of my machine that prevents the file from writing.  The machine is multi-homed which may be the issue.  I just tried the TFTP on another machine and all worked.  Thank you for the help.
0
 

Author Closing Comment

by:davebird
ID: 41909945
Please see explanation to public.  All is good.
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
f5 Persistence 14 52
cisco sg 200 trunking 4 26
move My Documents folder location to point to server's my documents 4 27
cisco switch 3750E port channel down 11 17
In this article, I am going to show you how to simulate a multi-site Lab environment on a single Hyper-V host. I use this method successfully in my own lab to simulate three fully routed global AD Sites on a Windows 10 Hyper-V host.
For months I had no idea how to 'discover' the IP address of the other end of a link (without asking someone who knows), and it drove me batty. Think about it. You can't use Cisco Discovery Protocol (CDP) because it's not implemented on the ASAs.…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
Both in life and business – not all partnerships are created equal. Spend 30 short minutes with us to learn:   • Key questions to ask when considering a partnership to accelerate your business into the cloud • Pitfalls and mistakes other partners…

803 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question