Solved

ASA VPN Tunnel access list WARNING

Posted on 2011-09-02
3
1,749 Views
Last Modified: 2012-06-27
I  have a site to site VPN tunnel setup and working between a 5520 and 5505.  However, when locking down the crypto access-list by specific ports, I received the following warning:

WARNING: access-list has port selectors.  This may impact performance.

An example is:
access-list outside_cryptomap ext permit tcp 172.16.0.0 255.255.255.0 host 10.200.0.40 eq 3389

So should I only use ip instead?
access-list permit ip 172.16.0.0 255.255.255.0 host 10.200.0.40

If so, how what is the recommendation on how to lock this down?  Or perhaps I should just ignore the 'This may impact performance' warning?
0
Comment
Question by:B1izzard
  • 2
3 Comments
 
LVL 35

Accepted Solution

by:
Ernie Beek earned 500 total points
ID: 36475853
What you could do is to use only ip on the crypto map list and remove the 'sysopt connection permit-vpn' from your config. After that you must allow vpn traffic by means of an ACE in the outside in access list. Here you should be able to lock it down to port level.
0
 

Author Closing Comment

by:B1izzard
ID: 36934104
Thanks.
0
 
LVL 35

Expert Comment

by:Ernie Beek
ID: 36934180
You're welcome, Thx for the points :)
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

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

Suggested Solutions

When I upgraded my ASA 8.2 to 8.3, I realized that my nonat statement was failing!   The log showed the following error:     %ASA-5-305013: Asymmetric NAT rules matched for forward and reverse flows It was caused by the config upgrade, because t…
This article offers some helpful and general tips for safe browsing and online shopping. It offers simple and manageable procedures that help to ensure the safety of one's personal information and the security of any devices.
As a trusted technology advisor to your customers you are likely getting the daily question of, ‘should I put this in the cloud?’ As customer demands for cloud services increases, companies will see a shift from traditional buying patterns to new…
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…

770 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