Disable the default ISAKMP policy?

Y at - there no way to disable or change the default ISAKMP policy?  I created the number 20 of the police, which is used in a VPN site-to site in vain for a quarterly PCI analysis the results come back in due to stage successful 1 authentication with encryption DES/DH768.  I reproduce these results with the help of ike-scan with explicit parameters OF/DH768.

This is a 2600 router and I just upgraded to 12.4 IOS (23) because I came across (http://www.cisco.com/en/US/docs/ios/security/command/reference/sec_c4.html) Cisco documentation which says that 12.4 (20) introduced the "no crypto isakmp default policy" - but I do not see this command still available to me.  Here are the results of sh crypto isakmp policy:

Priority protection suite 20

encryption algorithm: three key triple a

hash algorithm: Secure Hash Standard

authentication method: pre-shared Key

Diffie-Hellman group: #2 (1024 bits)

lifetime: 86400 seconds, no volume limit

Default protection suite

encryption algorithm: - Data Encryption STANDARD (56-bit keys).

hash algorithm: Secure Hash Standard

authentication method: Rivest-Shamir-Adleman Signature

Diffie-Hellman group: #1 (768 bits)

lifetime: 86400 seconds, no volume limit

Any help would be greatly appreciated!

Hello Anthony,.

I saw the link you provided.  It seems that this command was introduced in12.4 (20), T... note the T.  This indicates that it is only in the T-train train or technology and only seen in some other 12.4 T code or the train from 15.x newert.

You say that your router is runnign 12.4 (23) implicitly code Mainline (M).

The last T code for 2600 seems to be a 12.4 (15) T, so it does seem that you can enable this feature in order to disable the default policies.  It also seems that the 2600 series retired as no new code is released March 27, 2010.


Looks like you can be out of luck and may need to look for in buying a newer model router to get the newest software support and the ability to disable the default isakmp suite.

Of course, it is noted that while they can establish a session ISKMP, however, they will really be authenticated by the router in message MM 5 as most people use internal cases for certificates on the VPN.

I hope this helps.

Kind regards


Tags: Cisco Security

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