Cisco ASA VPN UDP ports

Is there a way to use different ports for isakmp/ipsec other than udp 500/4500?

Thanks,

chikagohAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

lanboyoCommented:
Possibly. Are you doing site to site or easy vpn?

0
lanboyoCommented:
For that matter you can use IPSEC over UDP to just permit a single  tcp port.

UDP is NAT traversal, I don't think you can change that one, but I have been wrong before.
0
chikagohAuthor Commented:
easyvpn
0
lanboyoCommented:
Okay..... udp 500 is isakmp, in easyvpn this is just used to negotiate tunnel paramaters, udp 4500 is for NAT-T traversal.

The ipsec data itself is unt udp or tcp at all, it is IP protocol 50.

So you can replace the ip protocol 50 using the command

ipsec-udp
      

Uses UDP encapsulation for the IPSec tunnels.

ipsec-udp-port
      

Specifies the port number for IPSec over UDP.

From
http://www.cisco.com/en/US/docs/security/asa/asa72/configuration/guide/ezvpn505.html#wp1017275

This is ipsec over tcp, thich puts everything within a single tcp session...

The following example shows how to configure the Easy VPN hardware client to use TCP-encapsulated IPSec, using the default port 10000, and to let it send large packets over the outside interface:

hostname(config)# vpnclient ipsec-over-tcp

hostname(config)# crypto ipsec df-bit clear-df outside

hostname(config)#


The next example shows how to configure the Easy VPN hardware client to use TCP-encapsulated IPSec, using the port 10501, and to let it send large packets over the outside interface:

hostname(config)# vpnclient ipsec-over-tcp port 10501

hostname(config)# crypto ipsec df-bit clear-df outside

hostname(config)#



0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
VPN

From novice to tech pro — start learning today.