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Cisco ASA VPN UDP ports

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

Thanks,

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chikagoh
Asked:
chikagoh
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1 Solution
 
lanboyoCommented:
Possibly. Are you doing site to site or easy vpn?

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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.
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chikagohAuthor Commented:
easyvpn
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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)#



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